2024y-10m-18d-02h-10m-29s UTC: drm-tip rerere cache update

git version 2.45.2

3 files changed, 6402 insertions, 0 deletions

diff --git a/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/postimage.1 b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/postimage.1
new file mode 100644
index 000000000000..7be8fb047b6c
--- /dev/null
+++ b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/postimage.1
@@ -0,0 +1,2126 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *             2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fixed.h>
+#include <drm/drm_probe_helper.h>
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_atomic.h"
+#include "intel_audio.h"
+#include "intel_connector.h"
+#include "intel_crtc.h"
+#include "intel_ddi.h"
+#include "intel_de.h"
+#include "intel_display_driver.h"
+#include "intel_display_types.h"
+#include "intel_dp.h"
+#include "intel_dp_hdcp.h"
+#include "intel_dp_link_training.h"
+#include "intel_dp_mst.h"
+#include "intel_dp_test.h"
+#include "intel_dp_tunnel.h"
+#include "intel_dpio_phy.h"
+#include "intel_hdcp.h"
+#include "intel_hotplug.h"
+#include "intel_link_bw.h"
+#include "intel_psr.h"
+#include "intel_vdsc.h"
+#include "skl_scaler.h"
+
+static int intel_dp_mst_max_dpt_bpp(const struct intel_crtc_state *crtc_state,
+				    bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	if (!intel_dp_is_uhbr(crtc_state) || DISPLAY_VER(i915) >= 20 || !dsc)
+		return INT_MAX;
+
+	/*
+	 * DSC->DPT interface width:
+	 *   ICL-MTL: 72 bits (each branch has 72 bits, only left branch is used)
+	 *   LNL+:    144 bits (not a bottleneck in any config)
+	 *
+	 * Bspec/49259 suggests that the FEC overhead needs to be
+	 * applied here, though HW people claim that neither this FEC
+	 * or any other overhead is applicable here (that is the actual
+	 * available_bw is just symbol_clock * 72). However based on
+	 * testing on MTL-P the
+	 * - DELL U3224KBA display
+	 * - Unigraf UCD-500 CTS test sink
+	 * devices the
+	 * - 5120x2880/995.59Mhz
+	 * - 6016x3384/1357.23Mhz
+	 * - 6144x3456/1413.39Mhz
+	 * modes (all the ones having a DPT limit on the above devices),
+	 * both the channel coding efficiency and an additional 3%
+	 * overhead needs to be accounted for.
+	 */
+	return div64_u64(mul_u32_u32(intel_dp_link_symbol_clock(crtc_state->port_clock) * 72,
+				     drm_dp_bw_channel_coding_efficiency(true)),
+			 mul_u32_u32(adjusted_mode->crtc_clock, 1030000));
+}
+
+static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
+				    const struct intel_connector *connector,
+				    bool ssc, int dsc_slice_count, int bpp_x16)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	unsigned long flags = DRM_DP_BW_OVERHEAD_MST;
+	int overhead;
+
+	flags |= intel_dp_is_uhbr(crtc_state) ? DRM_DP_BW_OVERHEAD_UHBR : 0;
+	flags |= ssc ? DRM_DP_BW_OVERHEAD_SSC_REF_CLK : 0;
+	flags |= crtc_state->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
+
+	if (dsc_slice_count)
+		flags |= DRM_DP_BW_OVERHEAD_DSC;
+
+	overhead = drm_dp_bw_overhead(crtc_state->lane_count,
+				      adjusted_mode->hdisplay,
+				      dsc_slice_count,
+				      bpp_x16,
+				      flags);
+
+	/*
+	 * TODO: clarify whether a minimum required by the fixed FEC overhead
+	 * in the bspec audio programming sequence is required here.
+	 */
+	return max(overhead, intel_dp_bw_fec_overhead(crtc_state->fec_enable));
+}
+
+static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
+				     const struct intel_connector *connector,
+				     int overhead,
+				     int bpp_x16,
+				     struct intel_link_m_n *m_n)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	/* TODO: Check WA 14013163432 to set data M/N for full BW utilization. */
+	intel_link_compute_m_n(bpp_x16, crtc_state->lane_count,
+			       adjusted_mode->crtc_clock,
+			       crtc_state->port_clock,
+			       overhead,
+			       m_n);
+
+	m_n->tu = DIV_ROUND_UP_ULL(mul_u32_u32(m_n->data_m, 64), m_n->data_n);
+}
+
+static int intel_dp_mst_calc_pbn(int pixel_clock, int bpp_x16, int bw_overhead)
+{
+	int effective_data_rate =
+		intel_dp_effective_data_rate(pixel_clock, bpp_x16, bw_overhead);
+
+	/*
+	 * TODO: Use drm_dp_calc_pbn_mode() instead, once it's converted
+	 * to calculate PBN with the BW overhead passed to it.
+	 */
+	return DIV_ROUND_UP(effective_data_rate * 64, 54 * 1000);
+}
+
+static int intel_dp_mst_dsc_get_slice_count(const struct intel_connector *connector,
+					    const struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int num_joined_pipes = crtc_state->joiner_pipes;
+
+	return intel_dp_dsc_get_slice_count(connector,
+					    adjusted_mode->clock,
+					    adjusted_mode->hdisplay,
+					    num_joined_pipes);
+}
+
+static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						int max_bpp,
+						int min_bpp,
+						struct link_config_limits *limits,
+						struct drm_connector_state *conn_state,
+						int step,
+						bool dsc)
+{
+	struct drm_atomic_state *state = crtc_state->uapi.state;
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_state *mst_state;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int bpp, slots = -EINVAL;
+	int dsc_slice_count = 0;
+	int max_dpt_bpp;
+	int ret = 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	crtc_state->lane_count = limits->max_lane_count;
+	crtc_state->port_clock = limits->max_rate;
+
+	if (dsc) {
+		if (!intel_dp_supports_fec(intel_dp, connector, crtc_state))
+			return -EINVAL;
+
+		crtc_state->fec_enable = !intel_dp_is_uhbr(crtc_state);
+	}
+
+	mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
+						      crtc_state->port_clock,
+						      crtc_state->lane_count);
+
+	max_dpt_bpp = intel_dp_mst_max_dpt_bpp(crtc_state, dsc);
+	if (max_bpp > max_dpt_bpp) {
+		drm_dbg_kms(&i915->drm, "Limiting bpp to max DPT bpp (%d -> %d)\n",
+			    max_bpp, max_dpt_bpp);
+		max_bpp = max_dpt_bpp;
+	}
+
+	drm_dbg_kms(&i915->drm, "Looking for slots in range min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	if (dsc) {
+		dsc_slice_count = intel_dp_mst_dsc_get_slice_count(connector, crtc_state);
+		if (!dsc_slice_count) {
+			drm_dbg_kms(&i915->drm, "Can't get valid DSC slice count\n");
+
+			return -ENOSPC;
+		}
+	}
+
+	for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
+		int local_bw_overhead;
+		int remote_bw_overhead;
+		int link_bpp_x16;
+		int remote_tu;
+		fixed20_12 pbn;
+
+		drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);
+
+		link_bpp_x16 = fxp_q4_from_int(dsc ? bpp :
+					       intel_dp_output_bpp(crtc_state->output_format, bpp));
+
+		local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							     false, dsc_slice_count, link_bpp_x16);
+		remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							      true, dsc_slice_count, link_bpp_x16);
+
+		intel_dp_mst_compute_m_n(crtc_state, connector,
+					 local_bw_overhead,
+					 link_bpp_x16,
+					 &crtc_state->dp_m_n);
+
+		/*
+		 * The TU size programmed to the HW determines which slots in
+		 * an MTP frame are used for this stream, which needs to match
+		 * the payload size programmed to the first downstream branch
+		 * device's payload table.
+		 *
+		 * Note that atm the payload's PBN value DRM core sends via
+		 * the ALLOCATE_PAYLOAD side-band message matches the payload
+		 * size (which it calculates from the PBN value) it programs
+		 * to the first branch device's payload table. The allocation
+		 * in the payload table could be reduced though (to
+		 * crtc_state->dp_m_n.tu), provided that the driver doesn't
+		 * enable SSC on the corresponding link.
+		 */
+		pbn.full = dfixed_const(intel_dp_mst_calc_pbn(adjusted_mode->crtc_clock,
+							      link_bpp_x16,
+							      remote_bw_overhead));
+		remote_tu = DIV_ROUND_UP(pbn.full, mst_state->pbn_div.full);
+
+		/*
+		 * Aligning the TUs ensures that symbols consisting of multiple
+		 * (4) symbol cycles don't get split between two consecutive
+		 * MTPs, as required by Bspec.
+		 * TODO: remove the alignment restriction for 128b/132b links
+		 * on some platforms, where Bspec allows this.
+		 */
+		remote_tu = ALIGN(remote_tu, 4 / crtc_state->lane_count);
+
+		/*
+		 * Also align PBNs accordingly, since MST core will derive its
+		 * own copy of TU from the PBN in drm_dp_atomic_find_time_slots().
+		 * The above comment about the difference between the PBN
+		 * allocated for the whole path and the TUs allocated for the
+		 * first branch device's link also applies here.
+		 */
+		pbn.full = remote_tu * mst_state->pbn_div.full;
+		crtc_state->pbn = dfixed_trunc(pbn);
+
+		drm_WARN_ON(&i915->drm, remote_tu < crtc_state->dp_m_n.tu);
+		crtc_state->dp_m_n.tu = remote_tu;
+
+		slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
+						      connector->port,
+						      crtc_state->pbn);
+		if (slots == -EDEADLK)
+			return slots;
+
+		if (slots >= 0) {
+			drm_WARN_ON(&i915->drm, slots != crtc_state->dp_m_n.tu);
+
+			break;
+		}
+	}
+
+	/* We failed to find a proper bpp/timeslots, return error */
+	if (ret)
+		slots = ret;
+
+	if (slots < 0) {
+		drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
+			    slots);
+	} else {
+		if (!dsc)
+			crtc_state->pipe_bpp = bpp;
+		else
+			crtc_state->dsc.compressed_bpp_x16 = fxp_q4_from_int(bpp);
+		drm_dbg_kms(&i915->drm, "Got %d slots for pipe bpp %d dsc %d\n", slots, bpp, dsc);
+	}
+
+	return slots;
+}
+
+static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state,
+					    struct link_config_limits *limits)
+{
+	int slots = -EINVAL;
+
+	/*
+	 * FIXME: allocate the BW according to link_bpp, which in the case of
+	 * YUV420 is only half of the pipe bpp value.
+	 */
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state,
+						     fxp_q4_to_int(limits->link.max_bpp_x16),
+						     fxp_q4_to_int(limits->link.min_bpp_x16),
+						     limits,
+						     conn_state, 2 * 3, false);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+
+static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						struct drm_connector_state *conn_state,
+						struct link_config_limits *limits)
+{
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	int slots = -EINVAL;
+	int i, num_bpc;
+	u8 dsc_bpc[3] = {};
+	int min_bpp, max_bpp, sink_min_bpp, sink_max_bpp;
+	u8 dsc_max_bpc;
+	int min_compressed_bpp, max_compressed_bpp;
+
+	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
+	if (DISPLAY_VER(i915) >= 12)
+		dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
+	else
+		dsc_max_bpc = min_t(u8, 10, conn_state->max_requested_bpc);
+
+	max_bpp = min_t(u8, dsc_max_bpc * 3, limits->pipe.max_bpp);
+	min_bpp = limits->pipe.min_bpp;
+
+	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(connector->dp.dsc_dpcd,
+						       dsc_bpc);
+
+	drm_dbg_kms(&i915->drm, "DSC Source supported min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	sink_max_bpp = dsc_bpc[0] * 3;
+	sink_min_bpp = sink_max_bpp;
+
+	for (i = 1; i < num_bpc; i++) {
+		if (sink_min_bpp > dsc_bpc[i] * 3)
+			sink_min_bpp = dsc_bpc[i] * 3;
+		if (sink_max_bpp < dsc_bpc[i] * 3)
+			sink_max_bpp = dsc_bpc[i] * 3;
+	}
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n",
+		    sink_min_bpp, sink_max_bpp);
+
+	if (min_bpp < sink_min_bpp)
+		min_bpp = sink_min_bpp;
+
+	if (max_bpp > sink_max_bpp)
+		max_bpp = sink_max_bpp;
+
+	crtc_state->pipe_bpp = max_bpp;
+
+	max_compressed_bpp = intel_dp_dsc_sink_max_compressed_bpp(connector,
+								  crtc_state,
+								  max_bpp / 3);
+	max_compressed_bpp = min(max_compressed_bpp,
+				 fxp_q4_to_int(limits->link.max_bpp_x16));
+
+	min_compressed_bpp = intel_dp_dsc_sink_min_compressed_bpp(crtc_state);
+	min_compressed_bpp = max(min_compressed_bpp,
+				 fxp_q4_to_int_roundup(limits->link.min_bpp_x16));
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported compressed min bpp %d compressed max bpp %d\n",
+		    min_compressed_bpp, max_compressed_bpp);
+
+	/* Align compressed bpps according to our own constraints */
+	max_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, max_compressed_bpp,
+							    crtc_state->pipe_bpp);
+	min_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, min_compressed_bpp,
+							    crtc_state->pipe_bpp);
+
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_compressed_bpp,
+						     min_compressed_bpp, limits,
+						     conn_state, 1, true);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
+				     struct intel_crtc_state *crtc_state,
+				     struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_topology_state *topology_state;
+	u8 link_coding_cap = intel_dp_is_uhbr(crtc_state) ?
+		DP_CAP_ANSI_128B132B : DP_CAP_ANSI_8B10B;
+
+	topology_state = drm_atomic_get_mst_topology_state(conn_state->state, mgr);
+	if (IS_ERR(topology_state)) {
+		drm_dbg_kms(&i915->drm, "slot update failed\n");
+		return PTR_ERR(topology_state);
+	}
+
+	drm_dp_mst_update_slots(topology_state, link_coding_cap);
+
+	return 0;
+}
+
+static int mode_hblank_period_ns(const struct drm_display_mode *mode)
+{
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(mode->htotal - mode->hdisplay,
+						 NSEC_PER_SEC / 1000),
+				     mode->crtc_clock);
+}
+
+static bool
+hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector,
+				 const struct intel_crtc_state *crtc_state,
+				 const struct link_config_limits *limits)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	bool is_uhbr_sink = connector->mst_port &&
+			    drm_dp_128b132b_supported(connector->mst_port->dpcd);
+	int hblank_limit = is_uhbr_sink ? 500 : 300;
+
+	if (!connector->dp.dsc_hblank_expansion_quirk)
+		return false;
+
+	if (is_uhbr_sink && !drm_dp_is_uhbr_rate(limits->max_rate))
+		return false;
+
+	if (mode_hblank_period_ns(adjusted_mode) > hblank_limit)
+		return false;
+
+	if (!intel_dp_mst_dsc_get_slice_count(connector, crtc_state))
+		return false;
+
+	return true;
+}
+
+static bool
+adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *connector,
+					     const struct intel_crtc_state *crtc_state,
+					     struct link_config_limits *limits,
+					     bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	int min_bpp_x16 = limits->link.min_bpp_x16;
+
+	if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state, limits))
+		return true;
+
+	if (!dsc) {
+		if (intel_dp_supports_dsc(connector, crtc_state)) {
+			drm_dbg_kms(&i915->drm,
+				    "[CRTC:%d:%s][CONNECTOR:%d:%s] DSC needed by hblank expansion quirk\n",
+				    crtc->base.base.id, crtc->base.name,
+				    connector->base.base.id, connector->base.name);
+			return false;
+		}
+
+		drm_dbg_kms(&i915->drm,
+			    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to 24 due to hblank expansion quirk\n",
+			    crtc->base.base.id, crtc->base.name,
+			    connector->base.base.id, connector->base.name);
+
+		if (limits->link.max_bpp_x16 < fxp_q4_from_int(24))
+			return false;
+
+		limits->link.min_bpp_x16 = fxp_q4_from_int(24);
+
+		return true;
+	}
+
+	drm_WARN_ON(&i915->drm, limits->min_rate != limits->max_rate);
+
+	if (limits->max_rate < 540000)
+		min_bpp_x16 = fxp_q4_from_int(13);
+	else if (limits->max_rate < 810000)
+		min_bpp_x16 = fxp_q4_from_int(10);
+
+	if (limits->link.min_bpp_x16 >= min_bpp_x16)
+		return true;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to " FXP_Q4_FMT " in DSC mode due to hblank expansion quirk\n",
+		    crtc->base.base.id, crtc->base.name,
+		    connector->base.base.id, connector->base.name,
+		    FXP_Q4_ARGS(min_bpp_x16));
+
+	if (limits->link.max_bpp_x16 < min_bpp_x16)
+		return false;
+
+	limits->link.min_bpp_x16 = min_bpp_x16;
+
+	return true;
+}
+
+static bool
+intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
+				   const struct intel_connector *connector,
+				   struct intel_crtc_state *crtc_state,
+				   bool dsc,
+				   struct link_config_limits *limits)
+{
+	/*
+	 * for MST we always configure max link bw - the spec doesn't
+	 * seem to suggest we should do otherwise.
+	 */
+	limits->min_rate = limits->max_rate =
+		intel_dp_max_link_rate(intel_dp);
+
+	limits->min_lane_count = limits->max_lane_count =
+		intel_dp_max_lane_count(intel_dp);
+
+	limits->pipe.min_bpp = intel_dp_min_bpp(crtc_state->output_format);
+	/*
+	 * FIXME: If all the streams can't fit into the link with
+	 * their current pipe_bpp we should reduce pipe_bpp across
+	 * the board until things start to fit. Until then we
+	 * limit to <= 8bpc since that's what was hardcoded for all
+	 * MST streams previously. This hack should be removed once
+	 * we have the proper retry logic in place.
+	 */
+	limits->pipe.max_bpp = min(crtc_state->pipe_bpp, 24);
+
+	intel_dp_test_compute_config(intel_dp, crtc_state, limits);
+
+	if (!intel_dp_compute_config_link_bpp_limits(intel_dp,
+						     crtc_state,
+						     dsc,
+						     limits))
+		return false;
+
+	return adjust_limits_for_dsc_hblank_expansion_quirk(connector,
+							    crtc_state,
+							    limits,
+							    dsc);
+}
+
+static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *pipe_config,
+				       struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	const struct drm_display_mode *adjusted_mode =
+		&pipe_config->hw.adjusted_mode;
+	struct link_config_limits limits;
+	bool dsc_needed, joiner_needs_dsc;
+	int num_joined_pipes;
+	int ret = 0;
+
+	if (pipe_config->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, connector, pipe_config))
+		return -EINVAL;
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
+		return -EINVAL;
+
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, connector,
+						     adjusted_mode->crtc_hdisplay,
+						     adjusted_mode->crtc_clock);
+	if (num_joined_pipes > 1)
+		pipe_config->joiner_pipes = GENMASK(crtc->pipe + num_joined_pipes - 1, crtc->pipe);
+
+	pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->has_pch_encoder = false;
+
+	joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes);
+
+	dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
+		     !intel_dp_mst_compute_config_limits(intel_dp,
+							 connector,
+							 pipe_config,
+							 false,
+							 &limits);
+
+	if (!dsc_needed) {
+		ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
+						       conn_state, &limits);
+
+		if (ret == -EDEADLK)
+			return ret;
+
+		if (ret)
+			dsc_needed = true;
+	}
+
+	/* enable compression if the mode doesn't fit available BW */
+	if (dsc_needed) {
+		drm_dbg_kms(&dev_priv->drm, "Try DSC (fallback=%s, joiner=%s, force=%s)\n",
+			    str_yes_no(ret), str_yes_no(joiner_needs_dsc),
+			    str_yes_no(intel_dp->force_dsc_en));
+
+		if (!intel_dp_supports_dsc(connector, pipe_config))
+			return -EINVAL;
+
+		if (!intel_dp_mst_compute_config_limits(intel_dp,
+							connector,
+							pipe_config,
+							true,
+							&limits))
+			return -EINVAL;
+
+		/*
+		 * FIXME: As bpc is hardcoded to 8, as mentioned above,
+		 * WARN and ignore the debug flag force_dsc_bpc for now.
+		 */
+		drm_WARN(&dev_priv->drm, intel_dp->force_dsc_bpc, "Cannot Force BPC for MST\n");
+		/*
+		 * Try to get at least some timeslots and then see, if
+		 * we can fit there with DSC.
+		 */
+		drm_dbg_kms(&dev_priv->drm, "Trying to find VCPI slots in DSC mode\n");
+
+		ret = intel_dp_dsc_mst_compute_link_config(encoder, pipe_config,
+							   conn_state, &limits);
+		if (ret < 0)
+			return ret;
+
+		ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
+						  conn_state, &limits,
+						  pipe_config->dp_m_n.tu, false);
+	}
+
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_update_slots(encoder, pipe_config, conn_state);
+	if (ret)
+		return ret;
+
+	pipe_config->limited_color_range =
+		intel_dp_limited_color_range(pipe_config, conn_state);
+
+	if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
+		pipe_config->lane_lat_optim_mask =
+			bxt_dpio_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
+
+	intel_dp_audio_compute_config(encoder, pipe_config, conn_state);
+
+	intel_ddi_compute_min_voltage_level(pipe_config);
+
+	intel_psr_compute_config(intel_dp, pipe_config, conn_state);
+
+	return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
+							pipe_config);
+}
+
+/*
+ * Iterate over all connectors and return a mask of
+ * all CPU transcoders streaming over the same DP link.
+ */
+static unsigned int
+intel_dp_mst_transcoder_mask(struct intel_atomic_state *state,
+			     struct intel_dp *mst_port)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 transcoders = 0;
+	int i;
+
+	if (DISPLAY_VER(dev_priv) < 12)
+		return 0;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		const struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector->mst_port != mst_port || !conn_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_state->base.crtc);
+		crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+		if (!crtc_state->hw.active)
+			continue;
+
+		transcoders |= BIT(crtc_state->cpu_transcoder);
+	}
+
+	return transcoders;
+}
+
+static u8 get_pipes_downstream_of_mst_port(struct intel_atomic_state *state,
+					   struct drm_dp_mst_topology_mgr *mst_mgr,
+					   struct drm_dp_mst_port *parent_port)
+{
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 mask = 0;
+	int i;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		if (!conn_state->base.crtc)
+			continue;
+
+		if (&connector->mst_port->mst_mgr != mst_mgr)
+			continue;
+
+		if (connector->port != parent_port &&
+		    !drm_dp_mst_port_downstream_of_parent(mst_mgr,
+							  connector->port,
+							  parent_port))
+			continue;
+
+		mask |= BIT(to_intel_crtc(conn_state->base.crtc)->pipe);
+	}
+
+	return mask;
+}
+
+static int intel_dp_mst_check_fec_change(struct intel_atomic_state *state,
+					 struct drm_dp_mst_topology_mgr *mst_mgr,
+					 struct intel_link_bw_limits *limits)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+	u8 mst_pipe_mask;
+	u8 fec_pipe_mask = 0;
+	int ret;
+
+	mst_pipe_mask = get_pipes_downstream_of_mst_port(state, mst_mgr, NULL);
+
+	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, mst_pipe_mask) {
+		struct intel_crtc_state *crtc_state =
+			intel_atomic_get_new_crtc_state(state, crtc);
+
+		/* Atomic connector check should've added all the MST CRTCs. */
+		if (drm_WARN_ON(&i915->drm, !crtc_state))
+			return -EINVAL;
+
+		if (crtc_state->fec_enable)
+			fec_pipe_mask |= BIT(crtc->pipe);
+	}
+
+	if (!fec_pipe_mask || mst_pipe_mask == fec_pipe_mask)
+		return 0;
+
+	limits->force_fec_pipes |= mst_pipe_mask;
+
+	ret = intel_modeset_pipes_in_mask_early(state, "MST FEC",
+						mst_pipe_mask);
+
+	return ret ? : -EAGAIN;
+}
+
+static int intel_dp_mst_check_bw(struct intel_atomic_state *state,
+				 struct drm_dp_mst_topology_mgr *mst_mgr,
+				 struct drm_dp_mst_topology_state *mst_state,
+				 struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_port *mst_port;
+	u8 mst_port_pipes;
+	int ret;
+
+	ret = drm_dp_mst_atomic_check_mgr(&state->base, mst_mgr, mst_state, &mst_port);
+	if (ret != -ENOSPC)
+		return ret;
+
+	mst_port_pipes = get_pipes_downstream_of_mst_port(state, mst_mgr, mst_port);
+
+	ret = intel_link_bw_reduce_bpp(state, limits,
+				       mst_port_pipes, "MST link BW");
+
+	return ret ? : -EAGAIN;
+}
+
+/**
+ * intel_dp_mst_atomic_check_link - check all modeset MST link configuration
+ * @state: intel atomic state
+ * @limits: link BW limits
+ *
+ * Check the link configuration for all modeset MST outputs. If the
+ * configuration is invalid @limits will be updated if possible to
+ * reduce the total BW, after which the configuration for all CRTCs in
+ * @state must be recomputed with the updated @limits.
+ *
+ * Returns:
+ *   - 0 if the confugration is valid
+ *   - %-EAGAIN, if the configuration is invalid and @limits got updated
+ *     with fallback values with which the configuration of all CRTCs in
+ *     @state must be recomputed
+ *   - Other negative error, if the configuration is invalid without a
+ *     fallback possibility, or the check failed for another reason
+ */
+int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
+				   struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_dp_mst_topology_state *mst_state;
+	int ret;
+	int i;
+
+	for_each_new_mst_mgr_in_state(&state->base, mgr, mst_state, i) {
+		ret = intel_dp_mst_check_fec_change(state, mgr, limits);
+		if (ret)
+			return ret;
+
+		ret = intel_dp_mst_check_bw(state, mgr, mst_state,
+					    limits);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int intel_dp_mst_compute_config_late(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	/* lowest numbered transcoder will be designated master */
+	crtc_state->mst_master_transcoder =
+		ffs(intel_dp_mst_transcoder_mask(state, intel_dp)) - 1;
+
+	return 0;
+}
+
+/*
+ * If one of the connectors in a MST stream needs a modeset, mark all CRTCs
+ * that shares the same MST stream as mode changed,
+ * intel_modeset_pipe_config()+intel_crtc_check_fastset() will take care to do
+ * a fastset when possible.
+ *
+ * On TGL+ this is required since each stream go through a master transcoder,
+ * so if the master transcoder needs modeset, all other streams in the
+ * topology need a modeset. All platforms need to add the atomic state
+ * for all streams in the topology, since a modeset on one may require
+ * changing the MST link BW usage of the others, which in turn needs a
+ * recomputation of the corresponding CRTC states.
+ */
+static int
+intel_dp_mst_atomic_topology_check(struct intel_connector *connector,
+				   struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct drm_connector_list_iter connector_list_iter;
+	struct intel_connector *connector_iter;
+	int ret = 0;
+
+	if (!intel_connector_needs_modeset(state, &connector->base))
+		return 0;
+
+	drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
+	for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
+		struct intel_digital_connector_state *conn_iter_state;
+		struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector_iter->mst_port != connector->mst_port ||
+		    connector_iter == connector)
+			continue;
+
+		conn_iter_state = intel_atomic_get_digital_connector_state(state,
+									   connector_iter);
+		if (IS_ERR(conn_iter_state)) {
+			ret = PTR_ERR(conn_iter_state);
+			break;
+		}
+
+		if (!conn_iter_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_iter_state->base.crtc);
+		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+		if (IS_ERR(crtc_state)) {
+			ret = PTR_ERR(crtc_state);
+			break;
+		}
+
+		ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
+		if (ret)
+			break;
+		crtc_state->uapi.mode_changed = true;
+	}
+	drm_connector_list_iter_end(&connector_list_iter);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_atomic_check(struct drm_connector *connector,
+			  struct drm_atomic_state *_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(_state);
+	struct intel_connector *intel_connector =
+		to_intel_connector(connector);
+	int ret;
+
+	ret = intel_digital_connector_atomic_check(connector, &state->base);
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_atomic_topology_check(intel_connector, state);
+	if (ret)
+		return ret;
+
+	if (intel_connector_needs_modeset(state, connector)) {
+		ret = intel_dp_tunnel_atomic_check_state(state,
+							 intel_connector->mst_port,
+							 intel_connector);
+		if (ret)
+			return ret;
+	}
+
+	return drm_dp_atomic_release_time_slots(&state->base,
+						&intel_connector->mst_port->mst_mgr,
+						intel_connector->port);
+}
+
+static void clear_act_sent(struct intel_encoder *encoder,
+			   const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	intel_de_write(i915, dp_tp_status_reg(encoder, crtc_state),
+		       DP_TP_STATUS_ACT_SENT);
+}
+
+static void wait_for_act_sent(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	if (intel_de_wait_for_set(i915, dp_tp_status_reg(encoder, crtc_state),
+				  DP_TP_STATUS_ACT_SENT, 1))
+		drm_err(&i915->drm, "Timed out waiting for ACT sent\n");
+
+	drm_dp_check_act_status(&intel_dp->mst_mgr);
+}
+
+static void intel_mst_disable_dp(struct intel_atomic_state *state,
+				 struct intel_encoder *encoder,
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+
+	drm_dbg_kms(&i915->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (intel_dp->active_mst_links == 1)
+		intel_dp->link_trained = false;
+
+	intel_hdcp_disable(intel_mst->connector);
+
+	intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
+}
+
+static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
+				      struct intel_encoder *encoder,
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct drm_connector_state *old_conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_dp_mst_topology_state *old_mst_state =
+		drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	struct drm_dp_mst_topology_state *new_mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	const struct drm_dp_mst_atomic_payload *old_payload =
+		drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
+	struct drm_dp_mst_atomic_payload *new_payload =
+		drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_crtc *pipe_crtc;
+	bool last_mst_stream;
+	int i;
+
+	intel_dp->active_mst_links--;
+	last_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && last_mst_stream &&
+		    !intel_dp_mst_is_master_trans(old_crtc_state));
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_off(old_pipe_crtc_state);
+	}
+
+	intel_disable_transcoder(old_crtc_state);
+
+	drm_dp_remove_payload_part1(&intel_dp->mst_mgr, new_mst_state, new_payload);
+
+	clear_act_sent(encoder, old_crtc_state);
+
+	intel_de_rmw(dev_priv,
+		     TRANS_DDI_FUNC_CTL(dev_priv, old_crtc_state->cpu_transcoder),
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC, 0);
+
+	wait_for_act_sent(encoder, old_crtc_state);
+
+	drm_dp_remove_payload_part2(&intel_dp->mst_mgr, new_mst_state,
+				    old_payload, new_payload);
+
+	intel_ddi_disable_transcoder_func(old_crtc_state);
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_dsc_disable(old_pipe_crtc_state);
+
+		if (DISPLAY_VER(dev_priv) >= 9)
+			skl_scaler_disable(old_pipe_crtc_state);
+		else
+			ilk_pfit_disable(old_pipe_crtc_state);
+	}
+
+	/*
+	 * Power down mst path before disabling the port, otherwise we end
+	 * up getting interrupts from the sink upon detecting link loss.
+	 */
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
+				     false);
+
+	/*
+	 * BSpec 4287: disable DIP after the transcoder is disabled and before
+	 * the transcoder clock select is set to none.
+	 */
+	intel_dp_set_infoframes(&dig_port->base, false,
+				old_crtc_state, NULL);
+	/*
+	 * From TGL spec: "If multi-stream slave transcoder: Configure
+	 * Transcoder Clock Select to direct no clock to the transcoder"
+	 *
+	 * From older GENs spec: "Configure Transcoder Clock Select to direct
+	 * no clock to the transcoder"
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !last_mst_stream)
+		intel_ddi_disable_transcoder_clock(old_crtc_state);
+
+
+	intel_mst->connector = NULL;
+	if (last_mst_stream)
+		dig_port->base.post_disable(state, &dig_port->base,
+						  old_crtc_state, NULL);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+}
+
+static void intel_mst_post_pll_disable_dp(struct intel_atomic_state *state,
+					  struct intel_encoder *encoder,
+					  const struct intel_crtc_state *old_crtc_state,
+					  const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0 &&
+	    dig_port->base.post_pll_disable)
+		dig_port->base.post_pll_disable(state, encoder, old_crtc_state, old_conn_state);
+}
+
+static void intel_mst_pre_pll_enable_dp(struct intel_atomic_state *state,
+					struct intel_encoder *encoder,
+					const struct intel_crtc_state *pipe_config,
+					const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0)
+		dig_port->base.pre_pll_enable(state, &dig_port->base,
+						    pipe_config, NULL);
+	else
+		/*
+		 * The port PLL state needs to get updated for secondary
+		 * streams as for the primary stream.
+		 */
+		intel_ddi_update_active_dpll(state, &dig_port->base,
+					     to_intel_crtc(pipe_config->uapi.crtc));
+}
+
+static bool intel_mst_probed_link_params_valid(struct intel_dp *intel_dp,
+					       int link_rate, int lane_count)
+{
+	return intel_dp->link.mst_probed_rate == link_rate &&
+		intel_dp->link.mst_probed_lane_count == lane_count;
+}
+
+static void intel_mst_set_probed_link_params(struct intel_dp *intel_dp,
+					     int link_rate, int lane_count)
+{
+	intel_dp->link.mst_probed_rate = link_rate;
+	intel_dp->link.mst_probed_lane_count = lane_count;
+}
+
+static void intel_mst_reprobe_topology(struct intel_dp *intel_dp,
+				       const struct intel_crtc_state *crtc_state)
+{
+	if (intel_mst_probed_link_params_valid(intel_dp,
+					       crtc_state->port_clock, crtc_state->lane_count))
+		return;
+
+	drm_dp_mst_topology_queue_probe(&intel_dp->mst_mgr);
+
+	intel_mst_set_probed_link_params(intel_dp,
+					 crtc_state->port_clock, crtc_state->lane_count);
+}
+
+static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
+				    struct intel_encoder *encoder,
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	int ret;
+	bool first_mst_stream;
+
+	/* MST encoders are bound to a crtc, not to a connector,
+	 * force the mapping here for get_hw_state.
+	 */
+	connector->encoder = encoder;
+	intel_mst->connector = connector;
+	first_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && first_mst_stream &&
+		    !intel_dp_mst_is_master_trans(pipe_config));
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (first_mst_stream)
+		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
+
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
+
+	intel_dp_sink_enable_decompression(state, connector, pipe_config);
+
+	if (first_mst_stream) {
+		dig_port->base.pre_enable(state, &dig_port->base,
+						pipe_config, NULL);
+
+		intel_mst_reprobe_topology(intel_dp, pipe_config);
+	}
+
+	intel_dp->active_mst_links++;
+
+	ret = drm_dp_add_payload_part1(&intel_dp->mst_mgr, mst_state,
+				       drm_atomic_get_mst_payload_state(mst_state, connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	/*
+	 * Before Gen 12 this is not done as part of
+	 * dig_port->base.pre_enable() and should be done here. For
+	 * Gen 12+ the step in which this should be done is different for the
+	 * first MST stream, so it's done on the DDI for the first stream and
+	 * here for the following ones.
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !first_mst_stream)
+		intel_ddi_enable_transcoder_clock(encoder, pipe_config);
+
+	intel_dsc_dp_pps_write(&dig_port->base, pipe_config);
+	intel_ddi_set_dp_msa(pipe_config, conn_state);
+}
+
+static void enable_bs_jitter_was(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	u32 clear = 0;
+	u32 set = 0;
+
+	if (!IS_ALDERLAKE_P(i915))
+		return;
+
+	if (!IS_DISPLAY_STEP(i915, STEP_D0, STEP_FOREVER))
+		return;
+
+	/* Wa_14013163432:adlp */
+	if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+		set |= DP_MST_FEC_BS_JITTER_WA(crtc_state->cpu_transcoder);
+
+	/* Wa_14014143976:adlp */
+	if (IS_DISPLAY_STEP(i915, STEP_E0, STEP_FOREVER)) {
+		if (intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+		else if (crtc_state->fec_enable)
+			clear |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+
+		if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_DPT_DPTP_ALIGN_WA(crtc_state->cpu_transcoder);
+	}
+
+	if (!clear && !set)
+		return;
+
+	intel_de_rmw(i915, CHICKEN_MISC_3, clear, set);
+}
+
+static void intel_mst_enable_dp(struct intel_atomic_state *state,
+				struct intel_encoder *encoder,
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector = to_intel_connector(conn_state->connector);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	enum transcoder trans = pipe_config->cpu_transcoder;
+	bool first_mst_stream = intel_dp->active_mst_links == 1;
+	struct intel_crtc *pipe_crtc;
+	int ret, i;
+
+	drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
+
+	if (intel_dp_is_uhbr(pipe_config)) {
+		const struct drm_display_mode *adjusted_mode =
+			&pipe_config->hw.adjusted_mode;
+		u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+		intel_de_write(dev_priv, TRANS_DP2_VFREQHIGH(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+		intel_de_write(dev_priv, TRANS_DP2_VFREQLOW(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+	}
+
+	enable_bs_jitter_was(pipe_config);
+
+	intel_ddi_enable_transcoder_func(encoder, pipe_config);
+
+	clear_act_sent(encoder, pipe_config);
+
+	intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(dev_priv, trans), 0,
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	wait_for_act_sent(encoder, pipe_config);
+
+	if (first_mst_stream)
+		intel_ddi_wait_for_fec_status(encoder, pipe_config, true);
+
+	ret = drm_dp_add_payload_part2(&intel_dp->mst_mgr,
+				       drm_atomic_get_mst_payload_state(mst_state,
+									connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	if (DISPLAY_VER(dev_priv) >= 12)
+		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, trans),
+			     FECSTALL_DIS_DPTSTREAM_DPTTG,
+			     pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
+
+	intel_audio_sdp_split_update(pipe_config);
+
+	intel_enable_transcoder(pipe_config);
+
+	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, pipe_config, i) {
+		const struct intel_crtc_state *pipe_crtc_state =
+			intel_atomic_get_new_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_on(pipe_crtc_state);
+	}
+
+	intel_hdcp_enable(state, encoder, pipe_config, conn_state);
+}
+
+static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
+				      enum pipe *pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	*pipe = intel_mst->pipe;
+	if (intel_mst->connector)
+		return true;
+	return false;
+}
+
+static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
+					struct intel_crtc_state *pipe_config)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	dig_port->base.get_config(&dig_port->base, pipe_config);
+}
+
+static bool intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder,
+					       struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	return intel_dp_initial_fastset_check(&dig_port->base, crtc_state);
+}
+
+static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_i915_private *i915 = to_i915(intel_connector->base.dev);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	const struct drm_edid *drm_edid;
+	int ret;
+
+	if (drm_connector_is_unregistered(connector))
+		return intel_connector_update_modes(connector, NULL);
+
+	if (!intel_display_driver_check_access(i915))
+		return drm_edid_connector_add_modes(connector);
+
+	drm_edid = drm_dp_mst_edid_read(connector, &intel_dp->mst_mgr, intel_connector->port);
+
+	ret = intel_connector_update_modes(connector, drm_edid);
+
+	drm_edid_free(drm_edid);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_connector_late_register(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	int ret;
+
+	ret = drm_dp_mst_connector_late_register(connector,
+						 intel_connector->port);
+	if (ret < 0)
+		return ret;
+
+	ret = intel_connector_register(connector);
+	if (ret < 0)
+		drm_dp_mst_connector_early_unregister(connector,
+						      intel_connector->port);
+
+	return ret;
+}
+
+static void
+intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+
+	intel_connector_unregister(connector);
+	drm_dp_mst_connector_early_unregister(connector,
+					      intel_connector->port);
+}
+
+static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.atomic_get_property = intel_digital_connector_atomic_get_property,
+	.atomic_set_property = intel_digital_connector_atomic_set_property,
+	.late_register = intel_dp_mst_connector_late_register,
+	.early_unregister = intel_dp_mst_connector_early_unregister,
+	.destroy = intel_connector_destroy,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_duplicate_state = intel_digital_connector_duplicate_state,
+};
+
+static int intel_dp_mst_get_modes(struct drm_connector *connector)
+{
+	return intel_dp_mst_get_ddc_modes(connector);
+}
+
+static int
+intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
+			    struct drm_display_mode *mode,
+			    struct drm_modeset_acquire_ctx *ctx,
+			    enum drm_mode_status *status)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_port *port = intel_connector->port;
+	const int min_bpp = 18;
+	int max_dotclk = to_i915(connector->dev)->display.cdclk.max_dotclk_freq;
+	int max_rate, mode_rate, max_lanes, max_link_clock;
+	int ret;
+	bool dsc = false;
+	u16 dsc_max_compressed_bpp = 0;
+	u8 dsc_slice_count = 0;
+	int target_clock = mode->clock;
+	int num_joined_pipes;
+
+	if (drm_connector_is_unregistered(connector)) {
+		*status = MODE_ERROR;
+		return 0;
+	}
+
+	*status = intel_cpu_transcoder_mode_valid(dev_priv, mode);
+	if (*status != MODE_OK)
+		return 0;
+
+	if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
+		*status = MODE_H_ILLEGAL;
+		return 0;
+	}
+
+	if (mode->clock < 10000) {
+		*status = MODE_CLOCK_LOW;
+		return 0;
+	}
+
+	max_link_clock = intel_dp_max_link_rate(intel_dp);
+	max_lanes = intel_dp_max_lane_count(intel_dp);
+
+	max_rate = intel_dp_max_link_data_rate(intel_dp,
+					       max_link_clock, max_lanes);
+	mode_rate = intel_dp_link_required(mode->clock, min_bpp);
+
+	/*
+	 * TODO:
+	 * - Also check if compression would allow for the mode
+	 * - Calculate the overhead using drm_dp_bw_overhead() /
+	 *   drm_dp_bw_channel_coding_efficiency(), similarly to the
+	 *   compute config code, as drm_dp_calc_pbn_mode() doesn't
+	 *   account with all the overheads.
+	 * - Check here and during compute config the BW reported by
+	 *   DFP_Link_Available_Payload_Bandwidth_Number (or the
+	 *   corresponding link capabilities of the sink) in case the
+	 *   stream is uncompressed for it by the last branch device.
+	 */
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, intel_connector,
+						     mode->hdisplay, target_clock);
+	max_dotclk *= num_joined_pipes;
+
+	ret = drm_modeset_lock(&mgr->base.lock, ctx);
+	if (ret)
+		return ret;
+
+	if (mode_rate > max_rate || mode->clock > max_dotclk ||
+	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (intel_dp_has_dsc(intel_connector)) {
+		/*
+		 * TBD pass the connector BPC,
+		 * for now U8_MAX so that max BPC on that platform would be picked
+		 */
+		int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_connector, U8_MAX);
+
+		if (drm_dp_sink_supports_fec(intel_connector->dp.fec_capability)) {
+			dsc_max_compressed_bpp =
+				intel_dp_dsc_get_max_compressed_bpp(dev_priv,
+								    max_link_clock,
+								    max_lanes,
+								    target_clock,
+								    mode->hdisplay,
+								    num_joined_pipes,
+								    INTEL_OUTPUT_FORMAT_RGB,
+								    pipe_bpp, 64);
+			dsc_slice_count =
+				intel_dp_dsc_get_slice_count(intel_connector,
+							     target_clock,
+							     mode->hdisplay,
+							     num_joined_pipes);
+		}
+
+		dsc = dsc_max_compressed_bpp && dsc_slice_count;
+	}
+
+	if (intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes) && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (mode_rate > max_rate && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	*status = intel_mode_valid_max_plane_size(dev_priv, mode, num_joined_pipes);
+	return 0;
+}
+
+static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
+							 struct drm_atomic_state *state)
+{
+	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
+											 connector);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct intel_crtc *crtc = to_intel_crtc(connector_state->crtc);
+
+	return &intel_dp->mst_encoders[crtc->pipe]->base.base;
+}
+
+static int
+intel_dp_mst_detect(struct drm_connector *connector,
+		    struct drm_modeset_acquire_ctx *ctx, bool force)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+
+	if (!intel_display_device_enabled(i915))
+		return connector_status_disconnected;
+
+	if (drm_connector_is_unregistered(connector))
+		return connector_status_disconnected;
+
+	if (!intel_display_driver_check_access(i915))
+		return connector->status;
+
+	return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
+				      intel_connector->port);
+}
+
+static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
+	.get_modes = intel_dp_mst_get_modes,
+	.mode_valid_ctx = intel_dp_mst_mode_valid_ctx,
+	.atomic_best_encoder = intel_mst_atomic_best_encoder,
+	.atomic_check = intel_dp_mst_atomic_check,
+	.detect_ctx = intel_dp_mst_detect,
+};
+
+static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(to_intel_encoder(encoder));
+
+	drm_encoder_cleanup(encoder);
+	kfree(intel_mst);
+}
+
+static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
+	.destroy = intel_dp_mst_encoder_destroy,
+};
+
+static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
+{
+	if (intel_attached_encoder(connector) && connector->base.state->crtc) {
+		enum pipe pipe;
+		if (!intel_attached_encoder(connector)->get_hw_state(intel_attached_encoder(connector), &pipe))
+			return false;
+		return true;
+	}
+	return false;
+}
+
+static int intel_dp_mst_add_properties(struct intel_dp *intel_dp,
+				       struct drm_connector *connector,
+				       const char *pathprop)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.path_property, 0);
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.tile_property, 0);
+
+	intel_attach_force_audio_property(connector);
+	intel_attach_broadcast_rgb_property(connector);
+
+	/*
+	 * Reuse the prop from the SST connector because we're
+	 * not allowed to create new props after device registration.
+	 */
+	connector->max_bpc_property =
+		intel_dp->attached_connector->base.max_bpc_property;
+	if (connector->max_bpc_property)
+		drm_connector_attach_max_bpc_property(connector, 6, 12);
+
+	return drm_connector_set_path_property(connector, pathprop);
+}
+
+static void
+intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
+					      struct intel_connector *connector)
+{
+	u8 dpcd_caps[DP_RECEIVER_CAP_SIZE];
+
+	if (!connector->dp.dsc_decompression_aux)
+		return;
+
+	if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
+		return;
+
+	intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], connector);
+}
+
+static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *connector)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct drm_dp_aux *aux = connector->dp.dsc_decompression_aux;
+	struct drm_dp_desc desc;
+	u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+	if (!aux)
+		return false;
+
+	/*
+	 * A logical port's OUI (at least for affected sinks) is all 0, so
+	 * instead of that the parent port's OUI is used for identification.
+	 */
+	if (drm_dp_mst_port_is_logical(connector->port)) {
+		aux = drm_dp_mst_aux_for_parent(connector->port);
+		if (!aux)
+			aux = &connector->mst_port->aux;
+	}
+
+	if (drm_dp_read_dpcd_caps(aux, dpcd) < 0)
+		return false;
+
+	if (drm_dp_read_desc(aux, &desc, drm_dp_is_branch(dpcd)) < 0)
+		return false;
+
+	if (!drm_dp_has_quirk(&desc,
+			      DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC))
+		return false;
+
+	/*
+	 * UHBR (MST sink) devices requiring this quirk don't advertise the
+	 * HBLANK expansion support. Presuming that they perform HBLANK
+	 * expansion internally, or are affected by this issue on modes with a
+	 * short HBLANK for other reasons.
+	 */
+	if (!drm_dp_128b132b_supported(dpcd) &&
+	    !(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE))
+		return false;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CONNECTOR:%d:%s] DSC HBLANK expansion quirk detected\n",
+		    connector->base.base.id, connector->base.name);
+
+	return true;
+}
+
+static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
+							struct drm_dp_mst_port *port,
+							const char *pathprop)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	enum pipe pipe;
+	int ret;
+
+	intel_connector = intel_connector_alloc();
+	if (!intel_connector)
+		return NULL;
+
+	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
+	intel_connector->sync_state = intel_dp_connector_sync_state;
+	intel_connector->mst_port = intel_dp;
+	intel_connector->port = port;
+	drm_dp_mst_get_port_malloc(port);
+
+	intel_dp_init_modeset_retry_work(intel_connector);
+
+	intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
+	intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
+	intel_connector->dp.dsc_hblank_expansion_quirk =
+		detect_dsc_hblank_expansion_quirk(intel_connector);
+
+	connector = &intel_connector->base;
+	ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret) {
+		drm_dp_mst_put_port_malloc(port);
+		intel_connector_free(intel_connector);
+		return NULL;
+	}
+
+	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
+
+	for_each_pipe(dev_priv, pipe) {
+		struct drm_encoder *enc =
+			&intel_dp->mst_encoders[pipe]->base.base;
+
+		ret = drm_connector_attach_encoder(&intel_connector->base, enc);
+		if (ret)
+			goto err;
+	}
+
+	ret = intel_dp_mst_add_properties(intel_dp, connector, pathprop);
+	if (ret)
+		goto err;
+
+	ret = intel_dp_hdcp_init(dig_port, intel_connector);
+	if (ret)
+		drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP MST init failed, skipping.\n",
+			    connector->name, connector->base.id);
+
+	return connector;
+
+err:
+	drm_connector_cleanup(connector);
+	return NULL;
+}
+
+static void
+intel_dp_mst_poll_hpd_irq(struct drm_dp_mst_topology_mgr *mgr)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+
+	intel_hpd_trigger_irq(dp_to_dig_port(intel_dp));
+}
+
+static const struct drm_dp_mst_topology_cbs mst_cbs = {
+	.add_connector = intel_dp_add_mst_connector,
+	.poll_hpd_irq = intel_dp_mst_poll_hpd_irq,
+};
+
+static struct intel_dp_mst_encoder *
+intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst;
+	struct intel_encoder *intel_encoder;
+	struct drm_device *dev = dig_port->base.base.dev;
+
+	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
+
+	if (!intel_mst)
+		return NULL;
+
+	intel_mst->pipe = pipe;
+	intel_encoder = &intel_mst->base;
+	intel_mst->primary = dig_port;
+
+	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
+			 DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
+
+	intel_encoder->type = INTEL_OUTPUT_DP_MST;
+	intel_encoder->power_domain = dig_port->base.power_domain;
+	intel_encoder->port = dig_port->base.port;
+	intel_encoder->cloneable = 0;
+	/*
+	 * This is wrong, but broken userspace uses the intersection
+	 * of possible_crtcs of all the encoders of a given connector
+	 * to figure out which crtcs can drive said connector. What
+	 * should be used instead is the union of possible_crtcs.
+	 * To keep such userspace functioning we must misconfigure
+	 * this to make sure the intersection is not empty :(
+	 */
+	intel_encoder->pipe_mask = ~0;
+
+	intel_encoder->compute_config = intel_dp_mst_compute_config;
+	intel_encoder->compute_config_late = intel_dp_mst_compute_config_late;
+	intel_encoder->disable = intel_mst_disable_dp;
+	intel_encoder->post_disable = intel_mst_post_disable_dp;
+	intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
+	intel_encoder->update_pipe = intel_ddi_update_pipe;
+	intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
+	intel_encoder->pre_enable = intel_mst_pre_enable_dp;
+	intel_encoder->enable = intel_mst_enable_dp;
+	intel_encoder->audio_enable = intel_audio_codec_enable;
+	intel_encoder->audio_disable = intel_audio_codec_disable;
+	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
+	intel_encoder->get_config = intel_dp_mst_enc_get_config;
+	intel_encoder->initial_fastset_check = intel_dp_mst_initial_fastset_check;
+
+	return intel_mst;
+
+}
+
+static bool
+intel_dp_create_fake_mst_encoders(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	enum pipe pipe;
+
+	for_each_pipe(dev_priv, pipe)
+		intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(dig_port, pipe);
+	return true;
+}
+
+int
+intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port)
+{
+	return dig_port->dp.active_mst_links;
+}
+
+int
+intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
+{
+	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	struct intel_dp *intel_dp = &dig_port->dp;
+	enum port port = dig_port->base.port;
+	int ret;
+
+	if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
+		return 0;
+
+	if (DISPLAY_VER(i915) < 12 && port == PORT_A)
+		return 0;
+
+	if (DISPLAY_VER(i915) < 11 && port == PORT_E)
+		return 0;
+
+	intel_dp->mst_mgr.cbs = &mst_cbs;
+
+	/* create encoders */
+	intel_dp_create_fake_mst_encoders(dig_port);
+	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
+					   &intel_dp->aux, 16, 3, conn_base_id);
+	if (ret) {
+		intel_dp->mst_mgr.cbs = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
+bool intel_dp_mst_source_support(struct intel_dp *intel_dp)
+{
+	return intel_dp->mst_mgr.cbs;
+}
+
+void
+intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (!intel_dp_mst_source_support(intel_dp))
+		return;
+
+	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
+	/* encoders will get killed by normal cleanup */
+
+	intel_dp->mst_mgr.cbs = NULL;
+}
+
+bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
+}
+
+bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
+	       crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_connector - add MST topology state for a connector
+ * @state: atomic state
+ * @connector: connector to add the state for
+ * @crtc: the CRTC @connector is attached to
+ *
+ * Add the MST topology state for @connector to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+static int
+intel_dp_mst_add_topology_state_for_connector(struct intel_atomic_state *state,
+					      struct intel_connector *connector,
+					      struct intel_crtc *crtc)
+{
+	struct drm_dp_mst_topology_state *mst_state;
+
+	if (!connector->mst_port)
+		return 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(&state->base,
+						      &connector->mst_port->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	mst_state->pending_crtc_mask |= drm_crtc_mask(&crtc->base);
+
+	return 0;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_crtc - add MST topology state for a CRTC
+ * @state: atomic state
+ * @crtc: CRTC to add the state for
+ *
+ * Add the MST topology state for @crtc to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
+					     struct intel_crtc *crtc)
+{
+	struct drm_connector *_connector;
+	struct drm_connector_state *conn_state;
+	int i;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		struct intel_connector *connector = to_intel_connector(_connector);
+		int ret;
+
+		if (conn_state->crtc != &crtc->base)
+			continue;
+
+		ret = intel_dp_mst_add_topology_state_for_connector(state, connector, crtc);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct intel_connector *
+get_connector_in_state_for_crtc(struct intel_atomic_state *state,
+				const struct intel_crtc *crtc)
+{
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector_state *new_conn_state;
+	struct drm_connector *_connector;
+	int i;
+
+	for_each_oldnew_connector_in_state(&state->base, _connector,
+					   old_conn_state, new_conn_state, i) {
+		struct intel_connector *connector =
+			to_intel_connector(_connector);
+
+		if (old_conn_state->crtc == &crtc->base ||
+		    new_conn_state->crtc == &crtc->base)
+			return connector;
+	}
+
+	return NULL;
+}
+
+/**
+ * intel_dp_mst_crtc_needs_modeset - check if changes in topology need to modeset the given CRTC
+ * @state: atomic state
+ * @crtc: CRTC for which to check the modeset requirement
+ *
+ * Check if any change in a MST topology requires a forced modeset on @crtc in
+ * this topology. One such change is enabling/disabling the DSC decompression
+ * state in the first branch device's UFP DPCD as required by one CRTC, while
+ * the other @crtc in the same topology is still active, requiring a full modeset
+ * on @crtc.
+ */
+bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state,
+				     struct intel_crtc *crtc)
+{
+	const struct intel_connector *crtc_connector;
+	const struct drm_connector_state *conn_state;
+	const struct drm_connector *_connector;
+	int i;
+
+	if (!intel_crtc_has_type(intel_atomic_get_new_crtc_state(state, crtc),
+				 INTEL_OUTPUT_DP_MST))
+		return false;
+
+	crtc_connector = get_connector_in_state_for_crtc(state, crtc);
+
+	if (!crtc_connector)
+		/* None of the connectors in the topology needs modeset */
+		return false;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		const struct intel_connector *connector =
+			to_intel_connector(_connector);
+		const struct intel_crtc_state *new_crtc_state;
+		const struct intel_crtc_state *old_crtc_state;
+		struct intel_crtc *crtc_iter;
+
+		if (connector->mst_port != crtc_connector->mst_port ||
+		    !conn_state->crtc)
+			continue;
+
+		crtc_iter = to_intel_crtc(conn_state->crtc);
+
+		new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc_iter);
+		old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc_iter);
+
+		if (!intel_crtc_needs_modeset(new_crtc_state))
+			continue;
+
+		if (old_crtc_state->dsc.compression_enable ==
+		    new_crtc_state->dsc.compression_enable)
+			continue;
+		/*
+		 * Toggling the decompression flag because of this stream in
+		 * the first downstream branch device's UFP DPCD may reset the
+		 * whole branch device. To avoid the reset while other streams
+		 * are also active modeset the whole MST topology in this
+		 * case.
+		 */
+		if (connector->dp.dsc_decompression_aux ==
+		    &connector->mst_port->aux)
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * intel_dp_mst_prepare_probe - Prepare an MST link for topology probing
+ * @intel_dp: DP port object
+ *
+ * Prepare an MST link for topology probing, programming the target
+ * link parameters to DPCD. This step is a requirement of the enumaration
+ * of path resources during probing.
+ */
+void intel_dp_mst_prepare_probe(struct intel_dp *intel_dp)
+{
+	int link_rate = intel_dp_max_link_rate(intel_dp);
+	int lane_count = intel_dp_max_lane_count(intel_dp);
+	u8 rate_select;
+	u8 link_bw;
+
+	if (intel_dp->link_trained)
+		return;
+
+	if (intel_mst_probed_link_params_valid(intel_dp, link_rate, lane_count))
+		return;
+
+	intel_dp_compute_rate(intel_dp, link_rate, &link_bw, &rate_select);
+
+	intel_dp_link_training_set_mode(intel_dp, link_rate, false);
+	intel_dp_link_training_set_bw(intel_dp, link_bw, rate_select, lane_count,
+				      drm_dp_enhanced_frame_cap(intel_dp->dpcd));
+
+	intel_mst_set_probed_link_params(intel_dp, link_rate, lane_count);
+}
+
+/*
+ * intel_dp_mst_verify_dpcd_state - verify the MST SW enabled state wrt. the DPCD
+ * @intel_dp: DP port object
+ *
+ * Verify if @intel_dp's MST enabled SW state matches the corresponding DPCD
+ * state. A long HPD pulse - not long enough to be detected as a disconnected
+ * state - could've reset the DPCD state, which requires tearing
+ * down/recreating the MST topology.
+ *
+ * Returns %true if the SW MST enabled and DPCD states match, %false
+ * otherwise.
+ */
+bool intel_dp_mst_verify_dpcd_state(struct intel_dp *intel_dp)
+{
+	struct intel_display *display = to_intel_display(intel_dp);
+	struct intel_connector *connector = intel_dp->attached_connector;
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct intel_encoder *encoder = &dig_port->base;
+	int ret;
+	u8 val;
+
+	if (!intel_dp->is_mst)
+		return true;
+
+	ret = drm_dp_dpcd_readb(intel_dp->mst_mgr.aux, DP_MSTM_CTRL, &val);
+
+	/* Adjust the expected register value for SST + SideBand. */
+	if (ret < 0 || val != (DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC)) {
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s][ENCODER:%d:%s] MST mode got reset, removing topology (ret=%d, ctrl=0x%02x)\n",
+			    connector->base.base.id, connector->base.name,
+			    encoder->base.base.id, encoder->base.name,
+			    ret, val);
+
+		return false;
+	}
+
+	return true;
+}
diff --git a/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage
new file mode 100644
index 000000000000..8b447a1209d5
--- /dev/null
+++ b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage
@@ -0,0 +1,2138 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *             2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fixed.h>
+#include <drm/drm_probe_helper.h>
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_atomic.h"
+#include "intel_audio.h"
+#include "intel_connector.h"
+#include "intel_crtc.h"
+#include "intel_ddi.h"
+#include "intel_de.h"
+#include "intel_display_driver.h"
+#include "intel_display_types.h"
+#include "intel_dp.h"
+#include "intel_dp_hdcp.h"
+#include "intel_dp_link_training.h"
+#include "intel_dp_mst.h"
+#include "intel_dp_test.h"
+#include "intel_dp_tunnel.h"
+#include "intel_dpio_phy.h"
+#include "intel_hdcp.h"
+#include "intel_hotplug.h"
+#include "intel_link_bw.h"
+#include "intel_psr.h"
+#include "intel_vdsc.h"
+#include "skl_scaler.h"
+
+static int intel_dp_mst_max_dpt_bpp(const struct intel_crtc_state *crtc_state,
+				    bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	if (!intel_dp_is_uhbr(crtc_state) || DISPLAY_VER(i915) >= 20 || !dsc)
+		return INT_MAX;
+
+	/*
+	 * DSC->DPT interface width:
+	 *   ICL-MTL: 72 bits (each branch has 72 bits, only left branch is used)
+	 *   LNL+:    144 bits (not a bottleneck in any config)
+	 *
+	 * Bspec/49259 suggests that the FEC overhead needs to be
+	 * applied here, though HW people claim that neither this FEC
+	 * or any other overhead is applicable here (that is the actual
+	 * available_bw is just symbol_clock * 72). However based on
+	 * testing on MTL-P the
+	 * - DELL U3224KBA display
+	 * - Unigraf UCD-500 CTS test sink
+	 * devices the
+	 * - 5120x2880/995.59Mhz
+	 * - 6016x3384/1357.23Mhz
+	 * - 6144x3456/1413.39Mhz
+	 * modes (all the ones having a DPT limit on the above devices),
+	 * both the channel coding efficiency and an additional 3%
+	 * overhead needs to be accounted for.
+	 */
+	return div64_u64(mul_u32_u32(intel_dp_link_symbol_clock(crtc_state->port_clock) * 72,
+				     drm_dp_bw_channel_coding_efficiency(true)),
+			 mul_u32_u32(adjusted_mode->crtc_clock, 1030000));
+}
+
+static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
+				    const struct intel_connector *connector,
+				    bool ssc, int dsc_slice_count, int bpp_x16)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	unsigned long flags = DRM_DP_BW_OVERHEAD_MST;
+	int overhead;
+
+	flags |= intel_dp_is_uhbr(crtc_state) ? DRM_DP_BW_OVERHEAD_UHBR : 0;
+	flags |= ssc ? DRM_DP_BW_OVERHEAD_SSC_REF_CLK : 0;
+	flags |= crtc_state->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
+
+<<<<<<<
+	if (dsc) {
+		int num_joined_pipes = intel_crtc_num_joined_pipes(crtc_state);
+
+		flags |= DRM_DP_BW_OVERHEAD_DSC;
+		dsc_slice_count = intel_dp_dsc_get_slice_count(connector,
+							       adjusted_mode->clock,
+							       adjusted_mode->hdisplay,
+							       num_joined_pipes);
+	}
+=======
+	if (dsc_slice_count)
+		flags |= DRM_DP_BW_OVERHEAD_DSC;
+>>>>>>>
+
+	overhead = drm_dp_bw_overhead(crtc_state->lane_count,
+				      adjusted_mode->hdisplay,
+				      dsc_slice_count,
+				      bpp_x16,
+				      flags);
+
+	/*
+	 * TODO: clarify whether a minimum required by the fixed FEC overhead
+	 * in the bspec audio programming sequence is required here.
+	 */
+	return max(overhead, intel_dp_bw_fec_overhead(crtc_state->fec_enable));
+}
+
+static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
+				     const struct intel_connector *connector,
+				     int overhead,
+				     int bpp_x16,
+				     struct intel_link_m_n *m_n)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	/* TODO: Check WA 14013163432 to set data M/N for full BW utilization. */
+	intel_link_compute_m_n(bpp_x16, crtc_state->lane_count,
+			       adjusted_mode->crtc_clock,
+			       crtc_state->port_clock,
+			       overhead,
+			       m_n);
+
+	m_n->tu = DIV_ROUND_UP_ULL(mul_u32_u32(m_n->data_m, 64), m_n->data_n);
+}
+
+static int intel_dp_mst_calc_pbn(int pixel_clock, int bpp_x16, int bw_overhead)
+{
+	int effective_data_rate =
+		intel_dp_effective_data_rate(pixel_clock, bpp_x16, bw_overhead);
+
+	/*
+	 * TODO: Use drm_dp_calc_pbn_mode() instead, once it's converted
+	 * to calculate PBN with the BW overhead passed to it.
+	 */
+	return DIV_ROUND_UP(effective_data_rate * 64, 54 * 1000);
+}
+
+static int intel_dp_mst_dsc_get_slice_count(const struct intel_connector *connector,
+					    const struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int num_joined_pipes = crtc_state->joiner_pipes;
+
+	return intel_dp_dsc_get_slice_count(connector,
+					    adjusted_mode->clock,
+					    adjusted_mode->hdisplay,
+					    num_joined_pipes);
+}
+
+static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						int max_bpp,
+						int min_bpp,
+						struct link_config_limits *limits,
+						struct drm_connector_state *conn_state,
+						int step,
+						bool dsc)
+{
+	struct drm_atomic_state *state = crtc_state->uapi.state;
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_state *mst_state;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int bpp, slots = -EINVAL;
+	int dsc_slice_count = 0;
+	int max_dpt_bpp;
+	int ret = 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	crtc_state->lane_count = limits->max_lane_count;
+	crtc_state->port_clock = limits->max_rate;
+
+	if (dsc) {
+		if (!intel_dp_supports_fec(intel_dp, connector, crtc_state))
+			return -EINVAL;
+
+		crtc_state->fec_enable = !intel_dp_is_uhbr(crtc_state);
+	}
+
+	mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
+						      crtc_state->port_clock,
+						      crtc_state->lane_count);
+
+	max_dpt_bpp = intel_dp_mst_max_dpt_bpp(crtc_state, dsc);
+	if (max_bpp > max_dpt_bpp) {
+		drm_dbg_kms(&i915->drm, "Limiting bpp to max DPT bpp (%d -> %d)\n",
+			    max_bpp, max_dpt_bpp);
+		max_bpp = max_dpt_bpp;
+	}
+
+	drm_dbg_kms(&i915->drm, "Looking for slots in range min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	if (dsc) {
+		dsc_slice_count = intel_dp_mst_dsc_get_slice_count(connector, crtc_state);
+		if (!dsc_slice_count) {
+			drm_dbg_kms(&i915->drm, "Can't get valid DSC slice count\n");
+
+			return -ENOSPC;
+		}
+	}
+
+	for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
+		int local_bw_overhead;
+		int remote_bw_overhead;
+		int link_bpp_x16;
+		int remote_tu;
+		fixed20_12 pbn;
+
+		drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);
+
+		link_bpp_x16 = fxp_q4_from_int(dsc ? bpp :
+					       intel_dp_output_bpp(crtc_state->output_format, bpp));
+
+		local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							     false, dsc_slice_count, link_bpp_x16);
+		remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							      true, dsc_slice_count, link_bpp_x16);
+
+		intel_dp_mst_compute_m_n(crtc_state, connector,
+					 local_bw_overhead,
+					 link_bpp_x16,
+					 &crtc_state->dp_m_n);
+
+		/*
+		 * The TU size programmed to the HW determines which slots in
+		 * an MTP frame are used for this stream, which needs to match
+		 * the payload size programmed to the first downstream branch
+		 * device's payload table.
+		 *
+		 * Note that atm the payload's PBN value DRM core sends via
+		 * the ALLOCATE_PAYLOAD side-band message matches the payload
+		 * size (which it calculates from the PBN value) it programs
+		 * to the first branch device's payload table. The allocation
+		 * in the payload table could be reduced though (to
+		 * crtc_state->dp_m_n.tu), provided that the driver doesn't
+		 * enable SSC on the corresponding link.
+		 */
+		pbn.full = dfixed_const(intel_dp_mst_calc_pbn(adjusted_mode->crtc_clock,
+							      link_bpp_x16,
+							      remote_bw_overhead));
+		remote_tu = DIV_ROUND_UP(pbn.full, mst_state->pbn_div.full);
+
+		/*
+		 * Aligning the TUs ensures that symbols consisting of multiple
+		 * (4) symbol cycles don't get split between two consecutive
+		 * MTPs, as required by Bspec.
+		 * TODO: remove the alignment restriction for 128b/132b links
+		 * on some platforms, where Bspec allows this.
+		 */
+		remote_tu = ALIGN(remote_tu, 4 / crtc_state->lane_count);
+
+		/*
+		 * Also align PBNs accordingly, since MST core will derive its
+		 * own copy of TU from the PBN in drm_dp_atomic_find_time_slots().
+		 * The above comment about the difference between the PBN
+		 * allocated for the whole path and the TUs allocated for the
+		 * first branch device's link also applies here.
+		 */
+		pbn.full = remote_tu * mst_state->pbn_div.full;
+		crtc_state->pbn = dfixed_trunc(pbn);
+
+		drm_WARN_ON(&i915->drm, remote_tu < crtc_state->dp_m_n.tu);
+		crtc_state->dp_m_n.tu = remote_tu;
+
+		slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
+						      connector->port,
+						      crtc_state->pbn);
+		if (slots == -EDEADLK)
+			return slots;
+
+		if (slots >= 0) {
+			drm_WARN_ON(&i915->drm, slots != crtc_state->dp_m_n.tu);
+
+			break;
+		}
+	}
+
+	/* We failed to find a proper bpp/timeslots, return error */
+	if (ret)
+		slots = ret;
+
+	if (slots < 0) {
+		drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
+			    slots);
+	} else {
+		if (!dsc)
+			crtc_state->pipe_bpp = bpp;
+		else
+			crtc_state->dsc.compressed_bpp_x16 = fxp_q4_from_int(bpp);
+		drm_dbg_kms(&i915->drm, "Got %d slots for pipe bpp %d dsc %d\n", slots, bpp, dsc);
+	}
+
+	return slots;
+}
+
+static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state,
+					    struct link_config_limits *limits)
+{
+	int slots = -EINVAL;
+
+	/*
+	 * FIXME: allocate the BW according to link_bpp, which in the case of
+	 * YUV420 is only half of the pipe bpp value.
+	 */
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state,
+						     fxp_q4_to_int(limits->link.max_bpp_x16),
+						     fxp_q4_to_int(limits->link.min_bpp_x16),
+						     limits,
+						     conn_state, 2 * 3, false);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+
+static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						struct drm_connector_state *conn_state,
+						struct link_config_limits *limits)
+{
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	int slots = -EINVAL;
+	int i, num_bpc;
+	u8 dsc_bpc[3] = {};
+	int min_bpp, max_bpp, sink_min_bpp, sink_max_bpp;
+	u8 dsc_max_bpc;
+	int min_compressed_bpp, max_compressed_bpp;
+
+	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
+	if (DISPLAY_VER(i915) >= 12)
+		dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
+	else
+		dsc_max_bpc = min_t(u8, 10, conn_state->max_requested_bpc);
+
+	max_bpp = min_t(u8, dsc_max_bpc * 3, limits->pipe.max_bpp);
+	min_bpp = limits->pipe.min_bpp;
+
+	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(connector->dp.dsc_dpcd,
+						       dsc_bpc);
+
+	drm_dbg_kms(&i915->drm, "DSC Source supported min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	sink_max_bpp = dsc_bpc[0] * 3;
+	sink_min_bpp = sink_max_bpp;
+
+	for (i = 1; i < num_bpc; i++) {
+		if (sink_min_bpp > dsc_bpc[i] * 3)
+			sink_min_bpp = dsc_bpc[i] * 3;
+		if (sink_max_bpp < dsc_bpc[i] * 3)
+			sink_max_bpp = dsc_bpc[i] * 3;
+	}
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n",
+		    sink_min_bpp, sink_max_bpp);
+
+	if (min_bpp < sink_min_bpp)
+		min_bpp = sink_min_bpp;
+
+	if (max_bpp > sink_max_bpp)
+		max_bpp = sink_max_bpp;
+
+	crtc_state->pipe_bpp = max_bpp;
+
+	max_compressed_bpp = intel_dp_dsc_sink_max_compressed_bpp(connector,
+								  crtc_state,
+								  max_bpp / 3);
+	max_compressed_bpp = min(max_compressed_bpp,
+				 fxp_q4_to_int(limits->link.max_bpp_x16));
+
+	min_compressed_bpp = intel_dp_dsc_sink_min_compressed_bpp(crtc_state);
+	min_compressed_bpp = max(min_compressed_bpp,
+				 fxp_q4_to_int_roundup(limits->link.min_bpp_x16));
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported compressed min bpp %d compressed max bpp %d\n",
+		    min_compressed_bpp, max_compressed_bpp);
+
+	/* Align compressed bpps according to our own constraints */
+	max_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, max_compressed_bpp,
+							    crtc_state->pipe_bpp);
+	min_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, min_compressed_bpp,
+							    crtc_state->pipe_bpp);
+
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_compressed_bpp,
+						     min_compressed_bpp, limits,
+						     conn_state, 1, true);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
+				     struct intel_crtc_state *crtc_state,
+				     struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_topology_state *topology_state;
+	u8 link_coding_cap = intel_dp_is_uhbr(crtc_state) ?
+		DP_CAP_ANSI_128B132B : DP_CAP_ANSI_8B10B;
+
+	topology_state = drm_atomic_get_mst_topology_state(conn_state->state, mgr);
+	if (IS_ERR(topology_state)) {
+		drm_dbg_kms(&i915->drm, "slot update failed\n");
+		return PTR_ERR(topology_state);
+	}
+
+	drm_dp_mst_update_slots(topology_state, link_coding_cap);
+
+	return 0;
+}
+
+static int mode_hblank_period_ns(const struct drm_display_mode *mode)
+{
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(mode->htotal - mode->hdisplay,
+						 NSEC_PER_SEC / 1000),
+				     mode->crtc_clock);
+}
+
+static bool
+hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector,
+				 const struct intel_crtc_state *crtc_state,
+				 const struct link_config_limits *limits)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	bool is_uhbr_sink = connector->mst_port &&
+			    drm_dp_128b132b_supported(connector->mst_port->dpcd);
+	int hblank_limit = is_uhbr_sink ? 500 : 300;
+
+	if (!connector->dp.dsc_hblank_expansion_quirk)
+		return false;
+
+	if (is_uhbr_sink && !drm_dp_is_uhbr_rate(limits->max_rate))
+		return false;
+
+	if (mode_hblank_period_ns(adjusted_mode) > hblank_limit)
+		return false;
+
+	if (!intel_dp_mst_dsc_get_slice_count(connector, crtc_state))
+		return false;
+
+	return true;
+}
+
+static bool
+adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *connector,
+					     const struct intel_crtc_state *crtc_state,
+					     struct link_config_limits *limits,
+					     bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	int min_bpp_x16 = limits->link.min_bpp_x16;
+
+	if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state, limits))
+		return true;
+
+	if (!dsc) {
+		if (intel_dp_supports_dsc(connector, crtc_state)) {
+			drm_dbg_kms(&i915->drm,
+				    "[CRTC:%d:%s][CONNECTOR:%d:%s] DSC needed by hblank expansion quirk\n",
+				    crtc->base.base.id, crtc->base.name,
+				    connector->base.base.id, connector->base.name);
+			return false;
+		}
+
+		drm_dbg_kms(&i915->drm,
+			    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to 24 due to hblank expansion quirk\n",
+			    crtc->base.base.id, crtc->base.name,
+			    connector->base.base.id, connector->base.name);
+
+		if (limits->link.max_bpp_x16 < fxp_q4_from_int(24))
+			return false;
+
+		limits->link.min_bpp_x16 = fxp_q4_from_int(24);
+
+		return true;
+	}
+
+	drm_WARN_ON(&i915->drm, limits->min_rate != limits->max_rate);
+
+	if (limits->max_rate < 540000)
+		min_bpp_x16 = fxp_q4_from_int(13);
+	else if (limits->max_rate < 810000)
+		min_bpp_x16 = fxp_q4_from_int(10);
+
+	if (limits->link.min_bpp_x16 >= min_bpp_x16)
+		return true;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to " FXP_Q4_FMT " in DSC mode due to hblank expansion quirk\n",
+		    crtc->base.base.id, crtc->base.name,
+		    connector->base.base.id, connector->base.name,
+		    FXP_Q4_ARGS(min_bpp_x16));
+
+	if (limits->link.max_bpp_x16 < min_bpp_x16)
+		return false;
+
+	limits->link.min_bpp_x16 = min_bpp_x16;
+
+	return true;
+}
+
+static bool
+intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
+				   const struct intel_connector *connector,
+				   struct intel_crtc_state *crtc_state,
+				   bool dsc,
+				   struct link_config_limits *limits)
+{
+	/*
+	 * for MST we always configure max link bw - the spec doesn't
+	 * seem to suggest we should do otherwise.
+	 */
+	limits->min_rate = limits->max_rate =
+		intel_dp_max_link_rate(intel_dp);
+
+	limits->min_lane_count = limits->max_lane_count =
+		intel_dp_max_lane_count(intel_dp);
+
+	limits->pipe.min_bpp = intel_dp_min_bpp(crtc_state->output_format);
+	/*
+	 * FIXME: If all the streams can't fit into the link with
+	 * their current pipe_bpp we should reduce pipe_bpp across
+	 * the board until things start to fit. Until then we
+	 * limit to <= 8bpc since that's what was hardcoded for all
+	 * MST streams previously. This hack should be removed once
+	 * we have the proper retry logic in place.
+	 */
+	limits->pipe.max_bpp = min(crtc_state->pipe_bpp, 24);
+
+	intel_dp_test_compute_config(intel_dp, crtc_state, limits);
+
+	if (!intel_dp_compute_config_link_bpp_limits(intel_dp,
+						     crtc_state,
+						     dsc,
+						     limits))
+		return false;
+
+	return adjust_limits_for_dsc_hblank_expansion_quirk(connector,
+							    crtc_state,
+							    limits,
+							    dsc);
+}
+
+static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *pipe_config,
+				       struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	const struct drm_display_mode *adjusted_mode =
+		&pipe_config->hw.adjusted_mode;
+	struct link_config_limits limits;
+	bool dsc_needed, joiner_needs_dsc;
+	int num_joined_pipes;
+	int ret = 0;
+
+	if (pipe_config->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, connector, pipe_config))
+		return -EINVAL;
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
+		return -EINVAL;
+
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, connector,
+						     adjusted_mode->crtc_hdisplay,
+						     adjusted_mode->crtc_clock);
+	if (num_joined_pipes > 1)
+		pipe_config->joiner_pipes = GENMASK(crtc->pipe + num_joined_pipes - 1, crtc->pipe);
+
+	pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->has_pch_encoder = false;
+
+	joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes);
+
+	dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
+		     !intel_dp_mst_compute_config_limits(intel_dp,
+							 connector,
+							 pipe_config,
+							 false,
+							 &limits);
+
+	if (!dsc_needed) {
+		ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
+						       conn_state, &limits);
+
+		if (ret == -EDEADLK)
+			return ret;
+
+		if (ret)
+			dsc_needed = true;
+	}
+
+	/* enable compression if the mode doesn't fit available BW */
+	if (dsc_needed) {
+		drm_dbg_kms(&dev_priv->drm, "Try DSC (fallback=%s, joiner=%s, force=%s)\n",
+			    str_yes_no(ret), str_yes_no(joiner_needs_dsc),
+			    str_yes_no(intel_dp->force_dsc_en));
+
+		if (!intel_dp_supports_dsc(connector, pipe_config))
+			return -EINVAL;
+
+		if (!intel_dp_mst_compute_config_limits(intel_dp,
+							connector,
+							pipe_config,
+							true,
+							&limits))
+			return -EINVAL;
+
+		/*
+		 * FIXME: As bpc is hardcoded to 8, as mentioned above,
+		 * WARN and ignore the debug flag force_dsc_bpc for now.
+		 */
+		drm_WARN(&dev_priv->drm, intel_dp->force_dsc_bpc, "Cannot Force BPC for MST\n");
+		/*
+		 * Try to get at least some timeslots and then see, if
+		 * we can fit there with DSC.
+		 */
+		drm_dbg_kms(&dev_priv->drm, "Trying to find VCPI slots in DSC mode\n");
+
+		ret = intel_dp_dsc_mst_compute_link_config(encoder, pipe_config,
+							   conn_state, &limits);
+		if (ret < 0)
+			return ret;
+
+		ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
+						  conn_state, &limits,
+						  pipe_config->dp_m_n.tu, false);
+	}
+
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_update_slots(encoder, pipe_config, conn_state);
+	if (ret)
+		return ret;
+
+	pipe_config->limited_color_range =
+		intel_dp_limited_color_range(pipe_config, conn_state);
+
+	if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
+		pipe_config->lane_lat_optim_mask =
+			bxt_dpio_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
+
+	intel_dp_audio_compute_config(encoder, pipe_config, conn_state);
+
+	intel_ddi_compute_min_voltage_level(pipe_config);
+
+	intel_psr_compute_config(intel_dp, pipe_config, conn_state);
+
+	return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
+							pipe_config);
+}
+
+/*
+ * Iterate over all connectors and return a mask of
+ * all CPU transcoders streaming over the same DP link.
+ */
+static unsigned int
+intel_dp_mst_transcoder_mask(struct intel_atomic_state *state,
+			     struct intel_dp *mst_port)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 transcoders = 0;
+	int i;
+
+	if (DISPLAY_VER(dev_priv) < 12)
+		return 0;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		const struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector->mst_port != mst_port || !conn_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_state->base.crtc);
+		crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+		if (!crtc_state->hw.active)
+			continue;
+
+		transcoders |= BIT(crtc_state->cpu_transcoder);
+	}
+
+	return transcoders;
+}
+
+static u8 get_pipes_downstream_of_mst_port(struct intel_atomic_state *state,
+					   struct drm_dp_mst_topology_mgr *mst_mgr,
+					   struct drm_dp_mst_port *parent_port)
+{
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 mask = 0;
+	int i;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		if (!conn_state->base.crtc)
+			continue;
+
+		if (&connector->mst_port->mst_mgr != mst_mgr)
+			continue;
+
+		if (connector->port != parent_port &&
+		    !drm_dp_mst_port_downstream_of_parent(mst_mgr,
+							  connector->port,
+							  parent_port))
+			continue;
+
+		mask |= BIT(to_intel_crtc(conn_state->base.crtc)->pipe);
+	}
+
+	return mask;
+}
+
+static int intel_dp_mst_check_fec_change(struct intel_atomic_state *state,
+					 struct drm_dp_mst_topology_mgr *mst_mgr,
+					 struct intel_link_bw_limits *limits)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+	u8 mst_pipe_mask;
+	u8 fec_pipe_mask = 0;
+	int ret;
+
+	mst_pipe_mask = get_pipes_downstream_of_mst_port(state, mst_mgr, NULL);
+
+	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, mst_pipe_mask) {
+		struct intel_crtc_state *crtc_state =
+			intel_atomic_get_new_crtc_state(state, crtc);
+
+		/* Atomic connector check should've added all the MST CRTCs. */
+		if (drm_WARN_ON(&i915->drm, !crtc_state))
+			return -EINVAL;
+
+		if (crtc_state->fec_enable)
+			fec_pipe_mask |= BIT(crtc->pipe);
+	}
+
+	if (!fec_pipe_mask || mst_pipe_mask == fec_pipe_mask)
+		return 0;
+
+	limits->force_fec_pipes |= mst_pipe_mask;
+
+	ret = intel_modeset_pipes_in_mask_early(state, "MST FEC",
+						mst_pipe_mask);
+
+	return ret ? : -EAGAIN;
+}
+
+static int intel_dp_mst_check_bw(struct intel_atomic_state *state,
+				 struct drm_dp_mst_topology_mgr *mst_mgr,
+				 struct drm_dp_mst_topology_state *mst_state,
+				 struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_port *mst_port;
+	u8 mst_port_pipes;
+	int ret;
+
+	ret = drm_dp_mst_atomic_check_mgr(&state->base, mst_mgr, mst_state, &mst_port);
+	if (ret != -ENOSPC)
+		return ret;
+
+	mst_port_pipes = get_pipes_downstream_of_mst_port(state, mst_mgr, mst_port);
+
+	ret = intel_link_bw_reduce_bpp(state, limits,
+				       mst_port_pipes, "MST link BW");
+
+	return ret ? : -EAGAIN;
+}
+
+/**
+ * intel_dp_mst_atomic_check_link - check all modeset MST link configuration
+ * @state: intel atomic state
+ * @limits: link BW limits
+ *
+ * Check the link configuration for all modeset MST outputs. If the
+ * configuration is invalid @limits will be updated if possible to
+ * reduce the total BW, after which the configuration for all CRTCs in
+ * @state must be recomputed with the updated @limits.
+ *
+ * Returns:
+ *   - 0 if the confugration is valid
+ *   - %-EAGAIN, if the configuration is invalid and @limits got updated
+ *     with fallback values with which the configuration of all CRTCs in
+ *     @state must be recomputed
+ *   - Other negative error, if the configuration is invalid without a
+ *     fallback possibility, or the check failed for another reason
+ */
+int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
+				   struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_dp_mst_topology_state *mst_state;
+	int ret;
+	int i;
+
+	for_each_new_mst_mgr_in_state(&state->base, mgr, mst_state, i) {
+		ret = intel_dp_mst_check_fec_change(state, mgr, limits);
+		if (ret)
+			return ret;
+
+		ret = intel_dp_mst_check_bw(state, mgr, mst_state,
+					    limits);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int intel_dp_mst_compute_config_late(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	/* lowest numbered transcoder will be designated master */
+	crtc_state->mst_master_transcoder =
+		ffs(intel_dp_mst_transcoder_mask(state, intel_dp)) - 1;
+
+	return 0;
+}
+
+/*
+ * If one of the connectors in a MST stream needs a modeset, mark all CRTCs
+ * that shares the same MST stream as mode changed,
+ * intel_modeset_pipe_config()+intel_crtc_check_fastset() will take care to do
+ * a fastset when possible.
+ *
+ * On TGL+ this is required since each stream go through a master transcoder,
+ * so if the master transcoder needs modeset, all other streams in the
+ * topology need a modeset. All platforms need to add the atomic state
+ * for all streams in the topology, since a modeset on one may require
+ * changing the MST link BW usage of the others, which in turn needs a
+ * recomputation of the corresponding CRTC states.
+ */
+static int
+intel_dp_mst_atomic_topology_check(struct intel_connector *connector,
+				   struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct drm_connector_list_iter connector_list_iter;
+	struct intel_connector *connector_iter;
+	int ret = 0;
+
+	if (!intel_connector_needs_modeset(state, &connector->base))
+		return 0;
+
+	drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
+	for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
+		struct intel_digital_connector_state *conn_iter_state;
+		struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector_iter->mst_port != connector->mst_port ||
+		    connector_iter == connector)
+			continue;
+
+		conn_iter_state = intel_atomic_get_digital_connector_state(state,
+									   connector_iter);
+		if (IS_ERR(conn_iter_state)) {
+			ret = PTR_ERR(conn_iter_state);
+			break;
+		}
+
+		if (!conn_iter_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_iter_state->base.crtc);
+		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+		if (IS_ERR(crtc_state)) {
+			ret = PTR_ERR(crtc_state);
+			break;
+		}
+
+		ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
+		if (ret)
+			break;
+		crtc_state->uapi.mode_changed = true;
+	}
+	drm_connector_list_iter_end(&connector_list_iter);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_atomic_check(struct drm_connector *connector,
+			  struct drm_atomic_state *_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(_state);
+	struct intel_connector *intel_connector =
+		to_intel_connector(connector);
+	int ret;
+
+	ret = intel_digital_connector_atomic_check(connector, &state->base);
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_atomic_topology_check(intel_connector, state);
+	if (ret)
+		return ret;
+
+	if (intel_connector_needs_modeset(state, connector)) {
+		ret = intel_dp_tunnel_atomic_check_state(state,
+							 intel_connector->mst_port,
+							 intel_connector);
+		if (ret)
+			return ret;
+	}
+
+	return drm_dp_atomic_release_time_slots(&state->base,
+						&intel_connector->mst_port->mst_mgr,
+						intel_connector->port);
+}
+
+static void clear_act_sent(struct intel_encoder *encoder,
+			   const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	intel_de_write(i915, dp_tp_status_reg(encoder, crtc_state),
+		       DP_TP_STATUS_ACT_SENT);
+}
+
+static void wait_for_act_sent(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	if (intel_de_wait_for_set(i915, dp_tp_status_reg(encoder, crtc_state),
+				  DP_TP_STATUS_ACT_SENT, 1))
+		drm_err(&i915->drm, "Timed out waiting for ACT sent\n");
+
+	drm_dp_check_act_status(&intel_dp->mst_mgr);
+}
+
+static void intel_mst_disable_dp(struct intel_atomic_state *state,
+				 struct intel_encoder *encoder,
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+
+	drm_dbg_kms(&i915->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (intel_dp->active_mst_links == 1)
+		intel_dp->link_trained = false;
+
+	intel_hdcp_disable(intel_mst->connector);
+
+	intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
+}
+
+static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
+				      struct intel_encoder *encoder,
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct drm_connector_state *old_conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_dp_mst_topology_state *old_mst_state =
+		drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	struct drm_dp_mst_topology_state *new_mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	const struct drm_dp_mst_atomic_payload *old_payload =
+		drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
+	struct drm_dp_mst_atomic_payload *new_payload =
+		drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_crtc *pipe_crtc;
+	bool last_mst_stream;
+	int i;
+
+	intel_dp->active_mst_links--;
+	last_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && last_mst_stream &&
+		    !intel_dp_mst_is_master_trans(old_crtc_state));
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_off(old_pipe_crtc_state);
+	}
+
+	intel_disable_transcoder(old_crtc_state);
+
+	drm_dp_remove_payload_part1(&intel_dp->mst_mgr, new_mst_state, new_payload);
+
+	clear_act_sent(encoder, old_crtc_state);
+
+	intel_de_rmw(dev_priv,
+		     TRANS_DDI_FUNC_CTL(dev_priv, old_crtc_state->cpu_transcoder),
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC, 0);
+
+	wait_for_act_sent(encoder, old_crtc_state);
+
+	drm_dp_remove_payload_part2(&intel_dp->mst_mgr, new_mst_state,
+				    old_payload, new_payload);
+
+	intel_ddi_disable_transcoder_func(old_crtc_state);
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_dsc_disable(old_pipe_crtc_state);
+
+		if (DISPLAY_VER(dev_priv) >= 9)
+			skl_scaler_disable(old_pipe_crtc_state);
+		else
+			ilk_pfit_disable(old_pipe_crtc_state);
+	}
+
+	/*
+	 * Power down mst path before disabling the port, otherwise we end
+	 * up getting interrupts from the sink upon detecting link loss.
+	 */
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
+				     false);
+
+	/*
+	 * BSpec 4287: disable DIP after the transcoder is disabled and before
+	 * the transcoder clock select is set to none.
+	 */
+	intel_dp_set_infoframes(&dig_port->base, false,
+				old_crtc_state, NULL);
+	/*
+	 * From TGL spec: "If multi-stream slave transcoder: Configure
+	 * Transcoder Clock Select to direct no clock to the transcoder"
+	 *
+	 * From older GENs spec: "Configure Transcoder Clock Select to direct
+	 * no clock to the transcoder"
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !last_mst_stream)
+		intel_ddi_disable_transcoder_clock(old_crtc_state);
+
+
+	intel_mst->connector = NULL;
+	if (last_mst_stream)
+		dig_port->base.post_disable(state, &dig_port->base,
+						  old_crtc_state, NULL);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+}
+
+static void intel_mst_post_pll_disable_dp(struct intel_atomic_state *state,
+					  struct intel_encoder *encoder,
+					  const struct intel_crtc_state *old_crtc_state,
+					  const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0 &&
+	    dig_port->base.post_pll_disable)
+		dig_port->base.post_pll_disable(state, encoder, old_crtc_state, old_conn_state);
+}
+
+static void intel_mst_pre_pll_enable_dp(struct intel_atomic_state *state,
+					struct intel_encoder *encoder,
+					const struct intel_crtc_state *pipe_config,
+					const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0)
+		dig_port->base.pre_pll_enable(state, &dig_port->base,
+						    pipe_config, NULL);
+	else
+		/*
+		 * The port PLL state needs to get updated for secondary
+		 * streams as for the primary stream.
+		 */
+		intel_ddi_update_active_dpll(state, &dig_port->base,
+					     to_intel_crtc(pipe_config->uapi.crtc));
+}
+
+static bool intel_mst_probed_link_params_valid(struct intel_dp *intel_dp,
+					       int link_rate, int lane_count)
+{
+	return intel_dp->link.mst_probed_rate == link_rate &&
+		intel_dp->link.mst_probed_lane_count == lane_count;
+}
+
+static void intel_mst_set_probed_link_params(struct intel_dp *intel_dp,
+					     int link_rate, int lane_count)
+{
+	intel_dp->link.mst_probed_rate = link_rate;
+	intel_dp->link.mst_probed_lane_count = lane_count;
+}
+
+static void intel_mst_reprobe_topology(struct intel_dp *intel_dp,
+				       const struct intel_crtc_state *crtc_state)
+{
+	if (intel_mst_probed_link_params_valid(intel_dp,
+					       crtc_state->port_clock, crtc_state->lane_count))
+		return;
+
+	drm_dp_mst_topology_queue_probe(&intel_dp->mst_mgr);
+
+	intel_mst_set_probed_link_params(intel_dp,
+					 crtc_state->port_clock, crtc_state->lane_count);
+}
+
+static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
+				    struct intel_encoder *encoder,
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	int ret;
+	bool first_mst_stream;
+
+	/* MST encoders are bound to a crtc, not to a connector,
+	 * force the mapping here for get_hw_state.
+	 */
+	connector->encoder = encoder;
+	intel_mst->connector = connector;
+	first_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && first_mst_stream &&
+		    !intel_dp_mst_is_master_trans(pipe_config));
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (first_mst_stream)
+		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
+
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
+
+	intel_dp_sink_enable_decompression(state, connector, pipe_config);
+
+	if (first_mst_stream) {
+		dig_port->base.pre_enable(state, &dig_port->base,
+						pipe_config, NULL);
+
+		intel_mst_reprobe_topology(intel_dp, pipe_config);
+	}
+
+	intel_dp->active_mst_links++;
+
+	ret = drm_dp_add_payload_part1(&intel_dp->mst_mgr, mst_state,
+				       drm_atomic_get_mst_payload_state(mst_state, connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	/*
+	 * Before Gen 12 this is not done as part of
+	 * dig_port->base.pre_enable() and should be done here. For
+	 * Gen 12+ the step in which this should be done is different for the
+	 * first MST stream, so it's done on the DDI for the first stream and
+	 * here for the following ones.
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !first_mst_stream)
+		intel_ddi_enable_transcoder_clock(encoder, pipe_config);
+
+	intel_dsc_dp_pps_write(&dig_port->base, pipe_config);
+	intel_ddi_set_dp_msa(pipe_config, conn_state);
+}
+
+static void enable_bs_jitter_was(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	u32 clear = 0;
+	u32 set = 0;
+
+	if (!IS_ALDERLAKE_P(i915))
+		return;
+
+	if (!IS_DISPLAY_STEP(i915, STEP_D0, STEP_FOREVER))
+		return;
+
+	/* Wa_14013163432:adlp */
+	if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+		set |= DP_MST_FEC_BS_JITTER_WA(crtc_state->cpu_transcoder);
+
+	/* Wa_14014143976:adlp */
+	if (IS_DISPLAY_STEP(i915, STEP_E0, STEP_FOREVER)) {
+		if (intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+		else if (crtc_state->fec_enable)
+			clear |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+
+		if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_DPT_DPTP_ALIGN_WA(crtc_state->cpu_transcoder);
+	}
+
+	if (!clear && !set)
+		return;
+
+	intel_de_rmw(i915, CHICKEN_MISC_3, clear, set);
+}
+
+static void intel_mst_enable_dp(struct intel_atomic_state *state,
+				struct intel_encoder *encoder,
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector = to_intel_connector(conn_state->connector);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	enum transcoder trans = pipe_config->cpu_transcoder;
+	bool first_mst_stream = intel_dp->active_mst_links == 1;
+	struct intel_crtc *pipe_crtc;
+	int ret, i;
+
+	drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
+
+	if (intel_dp_is_uhbr(pipe_config)) {
+		const struct drm_display_mode *adjusted_mode =
+			&pipe_config->hw.adjusted_mode;
+		u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+		intel_de_write(dev_priv, TRANS_DP2_VFREQHIGH(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+		intel_de_write(dev_priv, TRANS_DP2_VFREQLOW(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+	}
+
+	enable_bs_jitter_was(pipe_config);
+
+	intel_ddi_enable_transcoder_func(encoder, pipe_config);
+
+	clear_act_sent(encoder, pipe_config);
+
+	intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(dev_priv, trans), 0,
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	wait_for_act_sent(encoder, pipe_config);
+
+	if (first_mst_stream)
+		intel_ddi_wait_for_fec_status(encoder, pipe_config, true);
+
+	ret = drm_dp_add_payload_part2(&intel_dp->mst_mgr,
+				       drm_atomic_get_mst_payload_state(mst_state,
+									connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	if (DISPLAY_VER(dev_priv) >= 12)
+		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, trans),
+			     FECSTALL_DIS_DPTSTREAM_DPTTG,
+			     pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
+
+	intel_audio_sdp_split_update(pipe_config);
+
+	intel_enable_transcoder(pipe_config);
+
+	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, pipe_config, i) {
+		const struct intel_crtc_state *pipe_crtc_state =
+			intel_atomic_get_new_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_on(pipe_crtc_state);
+	}
+
+	intel_hdcp_enable(state, encoder, pipe_config, conn_state);
+}
+
+static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
+				      enum pipe *pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	*pipe = intel_mst->pipe;
+	if (intel_mst->connector)
+		return true;
+	return false;
+}
+
+static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
+					struct intel_crtc_state *pipe_config)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	dig_port->base.get_config(&dig_port->base, pipe_config);
+}
+
+static bool intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder,
+					       struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	return intel_dp_initial_fastset_check(&dig_port->base, crtc_state);
+}
+
+static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_i915_private *i915 = to_i915(intel_connector->base.dev);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	const struct drm_edid *drm_edid;
+	int ret;
+
+	if (drm_connector_is_unregistered(connector))
+		return intel_connector_update_modes(connector, NULL);
+
+	if (!intel_display_driver_check_access(i915))
+		return drm_edid_connector_add_modes(connector);
+
+	drm_edid = drm_dp_mst_edid_read(connector, &intel_dp->mst_mgr, intel_connector->port);
+
+	ret = intel_connector_update_modes(connector, drm_edid);
+
+	drm_edid_free(drm_edid);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_connector_late_register(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	int ret;
+
+	ret = drm_dp_mst_connector_late_register(connector,
+						 intel_connector->port);
+	if (ret < 0)
+		return ret;
+
+	ret = intel_connector_register(connector);
+	if (ret < 0)
+		drm_dp_mst_connector_early_unregister(connector,
+						      intel_connector->port);
+
+	return ret;
+}
+
+static void
+intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+
+	intel_connector_unregister(connector);
+	drm_dp_mst_connector_early_unregister(connector,
+					      intel_connector->port);
+}
+
+static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.atomic_get_property = intel_digital_connector_atomic_get_property,
+	.atomic_set_property = intel_digital_connector_atomic_set_property,
+	.late_register = intel_dp_mst_connector_late_register,
+	.early_unregister = intel_dp_mst_connector_early_unregister,
+	.destroy = intel_connector_destroy,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_duplicate_state = intel_digital_connector_duplicate_state,
+};
+
+static int intel_dp_mst_get_modes(struct drm_connector *connector)
+{
+	return intel_dp_mst_get_ddc_modes(connector);
+}
+
+static int
+intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
+			    struct drm_display_mode *mode,
+			    struct drm_modeset_acquire_ctx *ctx,
+			    enum drm_mode_status *status)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_port *port = intel_connector->port;
+	const int min_bpp = 18;
+	int max_dotclk = to_i915(connector->dev)->display.cdclk.max_dotclk_freq;
+	int max_rate, mode_rate, max_lanes, max_link_clock;
+	int ret;
+	bool dsc = false;
+	u16 dsc_max_compressed_bpp = 0;
+	u8 dsc_slice_count = 0;
+	int target_clock = mode->clock;
+	int num_joined_pipes;
+
+	if (drm_connector_is_unregistered(connector)) {
+		*status = MODE_ERROR;
+		return 0;
+	}
+
+	*status = intel_cpu_transcoder_mode_valid(dev_priv, mode);
+	if (*status != MODE_OK)
+		return 0;
+
+	if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
+		*status = MODE_H_ILLEGAL;
+		return 0;
+	}
+
+	if (mode->clock < 10000) {
+		*status = MODE_CLOCK_LOW;
+		return 0;
+	}
+
+	max_link_clock = intel_dp_max_link_rate(intel_dp);
+	max_lanes = intel_dp_max_lane_count(intel_dp);
+
+	max_rate = intel_dp_max_link_data_rate(intel_dp,
+					       max_link_clock, max_lanes);
+	mode_rate = intel_dp_link_required(mode->clock, min_bpp);
+
+	/*
+	 * TODO:
+	 * - Also check if compression would allow for the mode
+	 * - Calculate the overhead using drm_dp_bw_overhead() /
+	 *   drm_dp_bw_channel_coding_efficiency(), similarly to the
+	 *   compute config code, as drm_dp_calc_pbn_mode() doesn't
+	 *   account with all the overheads.
+	 * - Check here and during compute config the BW reported by
+	 *   DFP_Link_Available_Payload_Bandwidth_Number (or the
+	 *   corresponding link capabilities of the sink) in case the
+	 *   stream is uncompressed for it by the last branch device.
+	 */
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, intel_connector,
+						     mode->hdisplay, target_clock);
+	max_dotclk *= num_joined_pipes;
+
+	ret = drm_modeset_lock(&mgr->base.lock, ctx);
+	if (ret)
+		return ret;
+
+	if (mode_rate > max_rate || mode->clock > max_dotclk ||
+	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (intel_dp_has_dsc(intel_connector)) {
+		/*
+		 * TBD pass the connector BPC,
+		 * for now U8_MAX so that max BPC on that platform would be picked
+		 */
+		int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_connector, U8_MAX);
+
+		if (drm_dp_sink_supports_fec(intel_connector->dp.fec_capability)) {
+			dsc_max_compressed_bpp =
+				intel_dp_dsc_get_max_compressed_bpp(dev_priv,
+								    max_link_clock,
+								    max_lanes,
+								    target_clock,
+								    mode->hdisplay,
+								    num_joined_pipes,
+								    INTEL_OUTPUT_FORMAT_RGB,
+								    pipe_bpp, 64);
+			dsc_slice_count =
+				intel_dp_dsc_get_slice_count(intel_connector,
+							     target_clock,
+							     mode->hdisplay,
+							     num_joined_pipes);
+		}
+
+		dsc = dsc_max_compressed_bpp && dsc_slice_count;
+	}
+
+	if (intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes) && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (mode_rate > max_rate && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	*status = intel_mode_valid_max_plane_size(dev_priv, mode, num_joined_pipes);
+	return 0;
+}
+
+static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
+							 struct drm_atomic_state *state)
+{
+	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
+											 connector);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct intel_crtc *crtc = to_intel_crtc(connector_state->crtc);
+
+	return &intel_dp->mst_encoders[crtc->pipe]->base.base;
+}
+
+static int
+intel_dp_mst_detect(struct drm_connector *connector,
+		    struct drm_modeset_acquire_ctx *ctx, bool force)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+
+	if (!intel_display_device_enabled(i915))
+		return connector_status_disconnected;
+
+	if (drm_connector_is_unregistered(connector))
+		return connector_status_disconnected;
+
+	if (!intel_display_driver_check_access(i915))
+		return connector->status;
+
+	return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
+				      intel_connector->port);
+}
+
+static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
+	.get_modes = intel_dp_mst_get_modes,
+	.mode_valid_ctx = intel_dp_mst_mode_valid_ctx,
+	.atomic_best_encoder = intel_mst_atomic_best_encoder,
+	.atomic_check = intel_dp_mst_atomic_check,
+	.detect_ctx = intel_dp_mst_detect,
+};
+
+static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(to_intel_encoder(encoder));
+
+	drm_encoder_cleanup(encoder);
+	kfree(intel_mst);
+}
+
+static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
+	.destroy = intel_dp_mst_encoder_destroy,
+};
+
+static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
+{
+	if (intel_attached_encoder(connector) && connector->base.state->crtc) {
+		enum pipe pipe;
+		if (!intel_attached_encoder(connector)->get_hw_state(intel_attached_encoder(connector), &pipe))
+			return false;
+		return true;
+	}
+	return false;
+}
+
+static int intel_dp_mst_add_properties(struct intel_dp *intel_dp,
+				       struct drm_connector *connector,
+				       const char *pathprop)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.path_property, 0);
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.tile_property, 0);
+
+	intel_attach_force_audio_property(connector);
+	intel_attach_broadcast_rgb_property(connector);
+
+	/*
+	 * Reuse the prop from the SST connector because we're
+	 * not allowed to create new props after device registration.
+	 */
+	connector->max_bpc_property =
+		intel_dp->attached_connector->base.max_bpc_property;
+	if (connector->max_bpc_property)
+		drm_connector_attach_max_bpc_property(connector, 6, 12);
+
+	return drm_connector_set_path_property(connector, pathprop);
+}
+
+static void
+intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
+					      struct intel_connector *connector)
+{
+	u8 dpcd_caps[DP_RECEIVER_CAP_SIZE];
+
+	if (!connector->dp.dsc_decompression_aux)
+		return;
+
+	if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
+		return;
+
+	intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], connector);
+}
+
+static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *connector)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct drm_dp_aux *aux = connector->dp.dsc_decompression_aux;
+	struct drm_dp_desc desc;
+	u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+	if (!aux)
+		return false;
+
+	/*
+	 * A logical port's OUI (at least for affected sinks) is all 0, so
+	 * instead of that the parent port's OUI is used for identification.
+	 */
+	if (drm_dp_mst_port_is_logical(connector->port)) {
+		aux = drm_dp_mst_aux_for_parent(connector->port);
+		if (!aux)
+			aux = &connector->mst_port->aux;
+	}
+
+	if (drm_dp_read_dpcd_caps(aux, dpcd) < 0)
+		return false;
+
+	if (drm_dp_read_desc(aux, &desc, drm_dp_is_branch(dpcd)) < 0)
+		return false;
+
+	if (!drm_dp_has_quirk(&desc,
+			      DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC))
+		return false;
+
+	/*
+	 * UHBR (MST sink) devices requiring this quirk don't advertise the
+	 * HBLANK expansion support. Presuming that they perform HBLANK
+	 * expansion internally, or are affected by this issue on modes with a
+	 * short HBLANK for other reasons.
+	 */
+	if (!drm_dp_128b132b_supported(dpcd) &&
+	    !(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE))
+		return false;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CONNECTOR:%d:%s] DSC HBLANK expansion quirk detected\n",
+		    connector->base.base.id, connector->base.name);
+
+	return true;
+}
+
+static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
+							struct drm_dp_mst_port *port,
+							const char *pathprop)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	enum pipe pipe;
+	int ret;
+
+	intel_connector = intel_connector_alloc();
+	if (!intel_connector)
+		return NULL;
+
+	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
+	intel_connector->sync_state = intel_dp_connector_sync_state;
+	intel_connector->mst_port = intel_dp;
+	intel_connector->port = port;
+	drm_dp_mst_get_port_malloc(port);
+
+	intel_dp_init_modeset_retry_work(intel_connector);
+
+	intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
+	intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
+	intel_connector->dp.dsc_hblank_expansion_quirk =
+		detect_dsc_hblank_expansion_quirk(intel_connector);
+
+	connector = &intel_connector->base;
+	ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret) {
+		drm_dp_mst_put_port_malloc(port);
+		intel_connector_free(intel_connector);
+		return NULL;
+	}
+
+	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
+
+	for_each_pipe(dev_priv, pipe) {
+		struct drm_encoder *enc =
+			&intel_dp->mst_encoders[pipe]->base.base;
+
+		ret = drm_connector_attach_encoder(&intel_connector->base, enc);
+		if (ret)
+			goto err;
+	}
+
+	ret = intel_dp_mst_add_properties(intel_dp, connector, pathprop);
+	if (ret)
+		goto err;
+
+	ret = intel_dp_hdcp_init(dig_port, intel_connector);
+	if (ret)
+		drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP MST init failed, skipping.\n",
+			    connector->name, connector->base.id);
+
+	return connector;
+
+err:
+	drm_connector_cleanup(connector);
+	return NULL;
+}
+
+static void
+intel_dp_mst_poll_hpd_irq(struct drm_dp_mst_topology_mgr *mgr)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+
+	intel_hpd_trigger_irq(dp_to_dig_port(intel_dp));
+}
+
+static const struct drm_dp_mst_topology_cbs mst_cbs = {
+	.add_connector = intel_dp_add_mst_connector,
+	.poll_hpd_irq = intel_dp_mst_poll_hpd_irq,
+};
+
+static struct intel_dp_mst_encoder *
+intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst;
+	struct intel_encoder *intel_encoder;
+	struct drm_device *dev = dig_port->base.base.dev;
+
+	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
+
+	if (!intel_mst)
+		return NULL;
+
+	intel_mst->pipe = pipe;
+	intel_encoder = &intel_mst->base;
+	intel_mst->primary = dig_port;
+
+	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
+			 DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
+
+	intel_encoder->type = INTEL_OUTPUT_DP_MST;
+	intel_encoder->power_domain = dig_port->base.power_domain;
+	intel_encoder->port = dig_port->base.port;
+	intel_encoder->cloneable = 0;
+	/*
+	 * This is wrong, but broken userspace uses the intersection
+	 * of possible_crtcs of all the encoders of a given connector
+	 * to figure out which crtcs can drive said connector. What
+	 * should be used instead is the union of possible_crtcs.
+	 * To keep such userspace functioning we must misconfigure
+	 * this to make sure the intersection is not empty :(
+	 */
+	intel_encoder->pipe_mask = ~0;
+
+	intel_encoder->compute_config = intel_dp_mst_compute_config;
+	intel_encoder->compute_config_late = intel_dp_mst_compute_config_late;
+	intel_encoder->disable = intel_mst_disable_dp;
+	intel_encoder->post_disable = intel_mst_post_disable_dp;
+	intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
+	intel_encoder->update_pipe = intel_ddi_update_pipe;
+	intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
+	intel_encoder->pre_enable = intel_mst_pre_enable_dp;
+	intel_encoder->enable = intel_mst_enable_dp;
+	intel_encoder->audio_enable = intel_audio_codec_enable;
+	intel_encoder->audio_disable = intel_audio_codec_disable;
+	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
+	intel_encoder->get_config = intel_dp_mst_enc_get_config;
+	intel_encoder->initial_fastset_check = intel_dp_mst_initial_fastset_check;
+
+	return intel_mst;
+
+}
+
+static bool
+intel_dp_create_fake_mst_encoders(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	enum pipe pipe;
+
+	for_each_pipe(dev_priv, pipe)
+		intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(dig_port, pipe);
+	return true;
+}
+
+int
+intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port)
+{
+	return dig_port->dp.active_mst_links;
+}
+
+int
+intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
+{
+	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	struct intel_dp *intel_dp = &dig_port->dp;
+	enum port port = dig_port->base.port;
+	int ret;
+
+	if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
+		return 0;
+
+	if (DISPLAY_VER(i915) < 12 && port == PORT_A)
+		return 0;
+
+	if (DISPLAY_VER(i915) < 11 && port == PORT_E)
+		return 0;
+
+	intel_dp->mst_mgr.cbs = &mst_cbs;
+
+	/* create encoders */
+	intel_dp_create_fake_mst_encoders(dig_port);
+	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
+					   &intel_dp->aux, 16, 3, conn_base_id);
+	if (ret) {
+		intel_dp->mst_mgr.cbs = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
+bool intel_dp_mst_source_support(struct intel_dp *intel_dp)
+{
+	return intel_dp->mst_mgr.cbs;
+}
+
+void
+intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (!intel_dp_mst_source_support(intel_dp))
+		return;
+
+	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
+	/* encoders will get killed by normal cleanup */
+
+	intel_dp->mst_mgr.cbs = NULL;
+}
+
+bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
+}
+
+bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
+	       crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_connector - add MST topology state for a connector
+ * @state: atomic state
+ * @connector: connector to add the state for
+ * @crtc: the CRTC @connector is attached to
+ *
+ * Add the MST topology state for @connector to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+static int
+intel_dp_mst_add_topology_state_for_connector(struct intel_atomic_state *state,
+					      struct intel_connector *connector,
+					      struct intel_crtc *crtc)
+{
+	struct drm_dp_mst_topology_state *mst_state;
+
+	if (!connector->mst_port)
+		return 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(&state->base,
+						      &connector->mst_port->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	mst_state->pending_crtc_mask |= drm_crtc_mask(&crtc->base);
+
+	return 0;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_crtc - add MST topology state for a CRTC
+ * @state: atomic state
+ * @crtc: CRTC to add the state for
+ *
+ * Add the MST topology state for @crtc to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
+					     struct intel_crtc *crtc)
+{
+	struct drm_connector *_connector;
+	struct drm_connector_state *conn_state;
+	int i;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		struct intel_connector *connector = to_intel_connector(_connector);
+		int ret;
+
+		if (conn_state->crtc != &crtc->base)
+			continue;
+
+		ret = intel_dp_mst_add_topology_state_for_connector(state, connector, crtc);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct intel_connector *
+get_connector_in_state_for_crtc(struct intel_atomic_state *state,
+				const struct intel_crtc *crtc)
+{
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector_state *new_conn_state;
+	struct drm_connector *_connector;
+	int i;
+
+	for_each_oldnew_connector_in_state(&state->base, _connector,
+					   old_conn_state, new_conn_state, i) {
+		struct intel_connector *connector =
+			to_intel_connector(_connector);
+
+		if (old_conn_state->crtc == &crtc->base ||
+		    new_conn_state->crtc == &crtc->base)
+			return connector;
+	}
+
+	return NULL;
+}
+
+/**
+ * intel_dp_mst_crtc_needs_modeset - check if changes in topology need to modeset the given CRTC
+ * @state: atomic state
+ * @crtc: CRTC for which to check the modeset requirement
+ *
+ * Check if any change in a MST topology requires a forced modeset on @crtc in
+ * this topology. One such change is enabling/disabling the DSC decompression
+ * state in the first branch device's UFP DPCD as required by one CRTC, while
+ * the other @crtc in the same topology is still active, requiring a full modeset
+ * on @crtc.
+ */
+bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state,
+				     struct intel_crtc *crtc)
+{
+	const struct intel_connector *crtc_connector;
+	const struct drm_connector_state *conn_state;
+	const struct drm_connector *_connector;
+	int i;
+
+	if (!intel_crtc_has_type(intel_atomic_get_new_crtc_state(state, crtc),
+				 INTEL_OUTPUT_DP_MST))
+		return false;
+
+	crtc_connector = get_connector_in_state_for_crtc(state, crtc);
+
+	if (!crtc_connector)
+		/* None of the connectors in the topology needs modeset */
+		return false;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		const struct intel_connector *connector =
+			to_intel_connector(_connector);
+		const struct intel_crtc_state *new_crtc_state;
+		const struct intel_crtc_state *old_crtc_state;
+		struct intel_crtc *crtc_iter;
+
+		if (connector->mst_port != crtc_connector->mst_port ||
+		    !conn_state->crtc)
+			continue;
+
+		crtc_iter = to_intel_crtc(conn_state->crtc);
+
+		new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc_iter);
+		old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc_iter);
+
+		if (!intel_crtc_needs_modeset(new_crtc_state))
+			continue;
+
+		if (old_crtc_state->dsc.compression_enable ==
+		    new_crtc_state->dsc.compression_enable)
+			continue;
+		/*
+		 * Toggling the decompression flag because of this stream in
+		 * the first downstream branch device's UFP DPCD may reset the
+		 * whole branch device. To avoid the reset while other streams
+		 * are also active modeset the whole MST topology in this
+		 * case.
+		 */
+		if (connector->dp.dsc_decompression_aux ==
+		    &connector->mst_port->aux)
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * intel_dp_mst_prepare_probe - Prepare an MST link for topology probing
+ * @intel_dp: DP port object
+ *
+ * Prepare an MST link for topology probing, programming the target
+ * link parameters to DPCD. This step is a requirement of the enumaration
+ * of path resources during probing.
+ */
+void intel_dp_mst_prepare_probe(struct intel_dp *intel_dp)
+{
+	int link_rate = intel_dp_max_link_rate(intel_dp);
+	int lane_count = intel_dp_max_lane_count(intel_dp);
+	u8 rate_select;
+	u8 link_bw;
+
+	if (intel_dp->link_trained)
+		return;
+
+	if (intel_mst_probed_link_params_valid(intel_dp, link_rate, lane_count))
+		return;
+
+	intel_dp_compute_rate(intel_dp, link_rate, &link_bw, &rate_select);
+
+	intel_dp_link_training_set_mode(intel_dp, link_rate, false);
+	intel_dp_link_training_set_bw(intel_dp, link_bw, rate_select, lane_count,
+				      drm_dp_enhanced_frame_cap(intel_dp->dpcd));
+
+	intel_mst_set_probed_link_params(intel_dp, link_rate, lane_count);
+}
+
+/*
+ * intel_dp_mst_verify_dpcd_state - verify the MST SW enabled state wrt. the DPCD
+ * @intel_dp: DP port object
+ *
+ * Verify if @intel_dp's MST enabled SW state matches the corresponding DPCD
+ * state. A long HPD pulse - not long enough to be detected as a disconnected
+ * state - could've reset the DPCD state, which requires tearing
+ * down/recreating the MST topology.
+ *
+ * Returns %true if the SW MST enabled and DPCD states match, %false
+ * otherwise.
+ */
+bool intel_dp_mst_verify_dpcd_state(struct intel_dp *intel_dp)
+{
+	struct intel_display *display = to_intel_display(intel_dp);
+	struct intel_connector *connector = intel_dp->attached_connector;
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct intel_encoder *encoder = &dig_port->base;
+	int ret;
+	u8 val;
+
+	if (!intel_dp->is_mst)
+		return true;
+
+	ret = drm_dp_dpcd_readb(intel_dp->mst_mgr.aux, DP_MSTM_CTRL, &val);
+
+	/* Adjust the expected register value for SST + SideBand. */
+	if (ret < 0 || val != (DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC)) {
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s][ENCODER:%d:%s] MST mode got reset, removing topology (ret=%d, ctrl=0x%02x)\n",
+			    connector->base.base.id, connector->base.name,
+			    encoder->base.base.id, encoder->base.name,
+			    ret, val);
+
+		return false;
+	}
+
+	return true;
+}
diff --git a/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage.1 b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage.1
new file mode 100644
index 000000000000..8b447a1209d5
--- /dev/null
+++ b/rr-cache/f4a0c24ab0699435d50cf6b411f38c6d1dd09e85/preimage.1
@@ -0,0 +1,2138 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *             2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fixed.h>
+#include <drm/drm_probe_helper.h>
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_atomic.h"
+#include "intel_audio.h"
+#include "intel_connector.h"
+#include "intel_crtc.h"
+#include "intel_ddi.h"
+#include "intel_de.h"
+#include "intel_display_driver.h"
+#include "intel_display_types.h"
+#include "intel_dp.h"
+#include "intel_dp_hdcp.h"
+#include "intel_dp_link_training.h"
+#include "intel_dp_mst.h"
+#include "intel_dp_test.h"
+#include "intel_dp_tunnel.h"
+#include "intel_dpio_phy.h"
+#include "intel_hdcp.h"
+#include "intel_hotplug.h"
+#include "intel_link_bw.h"
+#include "intel_psr.h"
+#include "intel_vdsc.h"
+#include "skl_scaler.h"
+
+static int intel_dp_mst_max_dpt_bpp(const struct intel_crtc_state *crtc_state,
+				    bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	if (!intel_dp_is_uhbr(crtc_state) || DISPLAY_VER(i915) >= 20 || !dsc)
+		return INT_MAX;
+
+	/*
+	 * DSC->DPT interface width:
+	 *   ICL-MTL: 72 bits (each branch has 72 bits, only left branch is used)
+	 *   LNL+:    144 bits (not a bottleneck in any config)
+	 *
+	 * Bspec/49259 suggests that the FEC overhead needs to be
+	 * applied here, though HW people claim that neither this FEC
+	 * or any other overhead is applicable here (that is the actual
+	 * available_bw is just symbol_clock * 72). However based on
+	 * testing on MTL-P the
+	 * - DELL U3224KBA display
+	 * - Unigraf UCD-500 CTS test sink
+	 * devices the
+	 * - 5120x2880/995.59Mhz
+	 * - 6016x3384/1357.23Mhz
+	 * - 6144x3456/1413.39Mhz
+	 * modes (all the ones having a DPT limit on the above devices),
+	 * both the channel coding efficiency and an additional 3%
+	 * overhead needs to be accounted for.
+	 */
+	return div64_u64(mul_u32_u32(intel_dp_link_symbol_clock(crtc_state->port_clock) * 72,
+				     drm_dp_bw_channel_coding_efficiency(true)),
+			 mul_u32_u32(adjusted_mode->crtc_clock, 1030000));
+}
+
+static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
+				    const struct intel_connector *connector,
+				    bool ssc, int dsc_slice_count, int bpp_x16)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	unsigned long flags = DRM_DP_BW_OVERHEAD_MST;
+	int overhead;
+
+	flags |= intel_dp_is_uhbr(crtc_state) ? DRM_DP_BW_OVERHEAD_UHBR : 0;
+	flags |= ssc ? DRM_DP_BW_OVERHEAD_SSC_REF_CLK : 0;
+	flags |= crtc_state->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
+
+<<<<<<<
+	if (dsc) {
+		int num_joined_pipes = intel_crtc_num_joined_pipes(crtc_state);
+
+		flags |= DRM_DP_BW_OVERHEAD_DSC;
+		dsc_slice_count = intel_dp_dsc_get_slice_count(connector,
+							       adjusted_mode->clock,
+							       adjusted_mode->hdisplay,
+							       num_joined_pipes);
+	}
+=======
+	if (dsc_slice_count)
+		flags |= DRM_DP_BW_OVERHEAD_DSC;
+>>>>>>>
+
+	overhead = drm_dp_bw_overhead(crtc_state->lane_count,
+				      adjusted_mode->hdisplay,
+				      dsc_slice_count,
+				      bpp_x16,
+				      flags);
+
+	/*
+	 * TODO: clarify whether a minimum required by the fixed FEC overhead
+	 * in the bspec audio programming sequence is required here.
+	 */
+	return max(overhead, intel_dp_bw_fec_overhead(crtc_state->fec_enable));
+}
+
+static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
+				     const struct intel_connector *connector,
+				     int overhead,
+				     int bpp_x16,
+				     struct intel_link_m_n *m_n)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	/* TODO: Check WA 14013163432 to set data M/N for full BW utilization. */
+	intel_link_compute_m_n(bpp_x16, crtc_state->lane_count,
+			       adjusted_mode->crtc_clock,
+			       crtc_state->port_clock,
+			       overhead,
+			       m_n);
+
+	m_n->tu = DIV_ROUND_UP_ULL(mul_u32_u32(m_n->data_m, 64), m_n->data_n);
+}
+
+static int intel_dp_mst_calc_pbn(int pixel_clock, int bpp_x16, int bw_overhead)
+{
+	int effective_data_rate =
+		intel_dp_effective_data_rate(pixel_clock, bpp_x16, bw_overhead);
+
+	/*
+	 * TODO: Use drm_dp_calc_pbn_mode() instead, once it's converted
+	 * to calculate PBN with the BW overhead passed to it.
+	 */
+	return DIV_ROUND_UP(effective_data_rate * 64, 54 * 1000);
+}
+
+static int intel_dp_mst_dsc_get_slice_count(const struct intel_connector *connector,
+					    const struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int num_joined_pipes = crtc_state->joiner_pipes;
+
+	return intel_dp_dsc_get_slice_count(connector,
+					    adjusted_mode->clock,
+					    adjusted_mode->hdisplay,
+					    num_joined_pipes);
+}
+
+static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						int max_bpp,
+						int min_bpp,
+						struct link_config_limits *limits,
+						struct drm_connector_state *conn_state,
+						int step,
+						bool dsc)
+{
+	struct drm_atomic_state *state = crtc_state->uapi.state;
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_state *mst_state;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int bpp, slots = -EINVAL;
+	int dsc_slice_count = 0;
+	int max_dpt_bpp;
+	int ret = 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	crtc_state->lane_count = limits->max_lane_count;
+	crtc_state->port_clock = limits->max_rate;
+
+	if (dsc) {
+		if (!intel_dp_supports_fec(intel_dp, connector, crtc_state))
+			return -EINVAL;
+
+		crtc_state->fec_enable = !intel_dp_is_uhbr(crtc_state);
+	}
+
+	mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
+						      crtc_state->port_clock,
+						      crtc_state->lane_count);
+
+	max_dpt_bpp = intel_dp_mst_max_dpt_bpp(crtc_state, dsc);
+	if (max_bpp > max_dpt_bpp) {
+		drm_dbg_kms(&i915->drm, "Limiting bpp to max DPT bpp (%d -> %d)\n",
+			    max_bpp, max_dpt_bpp);
+		max_bpp = max_dpt_bpp;
+	}
+
+	drm_dbg_kms(&i915->drm, "Looking for slots in range min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	if (dsc) {
+		dsc_slice_count = intel_dp_mst_dsc_get_slice_count(connector, crtc_state);
+		if (!dsc_slice_count) {
+			drm_dbg_kms(&i915->drm, "Can't get valid DSC slice count\n");
+
+			return -ENOSPC;
+		}
+	}
+
+	for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
+		int local_bw_overhead;
+		int remote_bw_overhead;
+		int link_bpp_x16;
+		int remote_tu;
+		fixed20_12 pbn;
+
+		drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);
+
+		link_bpp_x16 = fxp_q4_from_int(dsc ? bpp :
+					       intel_dp_output_bpp(crtc_state->output_format, bpp));
+
+		local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							     false, dsc_slice_count, link_bpp_x16);
+		remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
+							      true, dsc_slice_count, link_bpp_x16);
+
+		intel_dp_mst_compute_m_n(crtc_state, connector,
+					 local_bw_overhead,
+					 link_bpp_x16,
+					 &crtc_state->dp_m_n);
+
+		/*
+		 * The TU size programmed to the HW determines which slots in
+		 * an MTP frame are used for this stream, which needs to match
+		 * the payload size programmed to the first downstream branch
+		 * device's payload table.
+		 *
+		 * Note that atm the payload's PBN value DRM core sends via
+		 * the ALLOCATE_PAYLOAD side-band message matches the payload
+		 * size (which it calculates from the PBN value) it programs
+		 * to the first branch device's payload table. The allocation
+		 * in the payload table could be reduced though (to
+		 * crtc_state->dp_m_n.tu), provided that the driver doesn't
+		 * enable SSC on the corresponding link.
+		 */
+		pbn.full = dfixed_const(intel_dp_mst_calc_pbn(adjusted_mode->crtc_clock,
+							      link_bpp_x16,
+							      remote_bw_overhead));
+		remote_tu = DIV_ROUND_UP(pbn.full, mst_state->pbn_div.full);
+
+		/*
+		 * Aligning the TUs ensures that symbols consisting of multiple
+		 * (4) symbol cycles don't get split between two consecutive
+		 * MTPs, as required by Bspec.
+		 * TODO: remove the alignment restriction for 128b/132b links
+		 * on some platforms, where Bspec allows this.
+		 */
+		remote_tu = ALIGN(remote_tu, 4 / crtc_state->lane_count);
+
+		/*
+		 * Also align PBNs accordingly, since MST core will derive its
+		 * own copy of TU from the PBN in drm_dp_atomic_find_time_slots().
+		 * The above comment about the difference between the PBN
+		 * allocated for the whole path and the TUs allocated for the
+		 * first branch device's link also applies here.
+		 */
+		pbn.full = remote_tu * mst_state->pbn_div.full;
+		crtc_state->pbn = dfixed_trunc(pbn);
+
+		drm_WARN_ON(&i915->drm, remote_tu < crtc_state->dp_m_n.tu);
+		crtc_state->dp_m_n.tu = remote_tu;
+
+		slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
+						      connector->port,
+						      crtc_state->pbn);
+		if (slots == -EDEADLK)
+			return slots;
+
+		if (slots >= 0) {
+			drm_WARN_ON(&i915->drm, slots != crtc_state->dp_m_n.tu);
+
+			break;
+		}
+	}
+
+	/* We failed to find a proper bpp/timeslots, return error */
+	if (ret)
+		slots = ret;
+
+	if (slots < 0) {
+		drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
+			    slots);
+	} else {
+		if (!dsc)
+			crtc_state->pipe_bpp = bpp;
+		else
+			crtc_state->dsc.compressed_bpp_x16 = fxp_q4_from_int(bpp);
+		drm_dbg_kms(&i915->drm, "Got %d slots for pipe bpp %d dsc %d\n", slots, bpp, dsc);
+	}
+
+	return slots;
+}
+
+static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state,
+					    struct link_config_limits *limits)
+{
+	int slots = -EINVAL;
+
+	/*
+	 * FIXME: allocate the BW according to link_bpp, which in the case of
+	 * YUV420 is only half of the pipe bpp value.
+	 */
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state,
+						     fxp_q4_to_int(limits->link.max_bpp_x16),
+						     fxp_q4_to_int(limits->link.min_bpp_x16),
+						     limits,
+						     conn_state, 2 * 3, false);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+
+static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state,
+						struct drm_connector_state *conn_state,
+						struct link_config_limits *limits)
+{
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	int slots = -EINVAL;
+	int i, num_bpc;
+	u8 dsc_bpc[3] = {};
+	int min_bpp, max_bpp, sink_min_bpp, sink_max_bpp;
+	u8 dsc_max_bpc;
+	int min_compressed_bpp, max_compressed_bpp;
+
+	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
+	if (DISPLAY_VER(i915) >= 12)
+		dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
+	else
+		dsc_max_bpc = min_t(u8, 10, conn_state->max_requested_bpc);
+
+	max_bpp = min_t(u8, dsc_max_bpc * 3, limits->pipe.max_bpp);
+	min_bpp = limits->pipe.min_bpp;
+
+	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(connector->dp.dsc_dpcd,
+						       dsc_bpc);
+
+	drm_dbg_kms(&i915->drm, "DSC Source supported min bpp %d max bpp %d\n",
+		    min_bpp, max_bpp);
+
+	sink_max_bpp = dsc_bpc[0] * 3;
+	sink_min_bpp = sink_max_bpp;
+
+	for (i = 1; i < num_bpc; i++) {
+		if (sink_min_bpp > dsc_bpc[i] * 3)
+			sink_min_bpp = dsc_bpc[i] * 3;
+		if (sink_max_bpp < dsc_bpc[i] * 3)
+			sink_max_bpp = dsc_bpc[i] * 3;
+	}
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n",
+		    sink_min_bpp, sink_max_bpp);
+
+	if (min_bpp < sink_min_bpp)
+		min_bpp = sink_min_bpp;
+
+	if (max_bpp > sink_max_bpp)
+		max_bpp = sink_max_bpp;
+
+	crtc_state->pipe_bpp = max_bpp;
+
+	max_compressed_bpp = intel_dp_dsc_sink_max_compressed_bpp(connector,
+								  crtc_state,
+								  max_bpp / 3);
+	max_compressed_bpp = min(max_compressed_bpp,
+				 fxp_q4_to_int(limits->link.max_bpp_x16));
+
+	min_compressed_bpp = intel_dp_dsc_sink_min_compressed_bpp(crtc_state);
+	min_compressed_bpp = max(min_compressed_bpp,
+				 fxp_q4_to_int_roundup(limits->link.min_bpp_x16));
+
+	drm_dbg_kms(&i915->drm, "DSC Sink supported compressed min bpp %d compressed max bpp %d\n",
+		    min_compressed_bpp, max_compressed_bpp);
+
+	/* Align compressed bpps according to our own constraints */
+	max_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, max_compressed_bpp,
+							    crtc_state->pipe_bpp);
+	min_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, min_compressed_bpp,
+							    crtc_state->pipe_bpp);
+
+	slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_compressed_bpp,
+						     min_compressed_bpp, limits,
+						     conn_state, 1, true);
+
+	if (slots < 0)
+		return slots;
+
+	return 0;
+}
+static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
+				     struct intel_crtc_state *crtc_state,
+				     struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_topology_state *topology_state;
+	u8 link_coding_cap = intel_dp_is_uhbr(crtc_state) ?
+		DP_CAP_ANSI_128B132B : DP_CAP_ANSI_8B10B;
+
+	topology_state = drm_atomic_get_mst_topology_state(conn_state->state, mgr);
+	if (IS_ERR(topology_state)) {
+		drm_dbg_kms(&i915->drm, "slot update failed\n");
+		return PTR_ERR(topology_state);
+	}
+
+	drm_dp_mst_update_slots(topology_state, link_coding_cap);
+
+	return 0;
+}
+
+static int mode_hblank_period_ns(const struct drm_display_mode *mode)
+{
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(mode->htotal - mode->hdisplay,
+						 NSEC_PER_SEC / 1000),
+				     mode->crtc_clock);
+}
+
+static bool
+hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector,
+				 const struct intel_crtc_state *crtc_state,
+				 const struct link_config_limits *limits)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	bool is_uhbr_sink = connector->mst_port &&
+			    drm_dp_128b132b_supported(connector->mst_port->dpcd);
+	int hblank_limit = is_uhbr_sink ? 500 : 300;
+
+	if (!connector->dp.dsc_hblank_expansion_quirk)
+		return false;
+
+	if (is_uhbr_sink && !drm_dp_is_uhbr_rate(limits->max_rate))
+		return false;
+
+	if (mode_hblank_period_ns(adjusted_mode) > hblank_limit)
+		return false;
+
+	if (!intel_dp_mst_dsc_get_slice_count(connector, crtc_state))
+		return false;
+
+	return true;
+}
+
+static bool
+adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *connector,
+					     const struct intel_crtc_state *crtc_state,
+					     struct link_config_limits *limits,
+					     bool dsc)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	int min_bpp_x16 = limits->link.min_bpp_x16;
+
+	if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state, limits))
+		return true;
+
+	if (!dsc) {
+		if (intel_dp_supports_dsc(connector, crtc_state)) {
+			drm_dbg_kms(&i915->drm,
+				    "[CRTC:%d:%s][CONNECTOR:%d:%s] DSC needed by hblank expansion quirk\n",
+				    crtc->base.base.id, crtc->base.name,
+				    connector->base.base.id, connector->base.name);
+			return false;
+		}
+
+		drm_dbg_kms(&i915->drm,
+			    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to 24 due to hblank expansion quirk\n",
+			    crtc->base.base.id, crtc->base.name,
+			    connector->base.base.id, connector->base.name);
+
+		if (limits->link.max_bpp_x16 < fxp_q4_from_int(24))
+			return false;
+
+		limits->link.min_bpp_x16 = fxp_q4_from_int(24);
+
+		return true;
+	}
+
+	drm_WARN_ON(&i915->drm, limits->min_rate != limits->max_rate);
+
+	if (limits->max_rate < 540000)
+		min_bpp_x16 = fxp_q4_from_int(13);
+	else if (limits->max_rate < 810000)
+		min_bpp_x16 = fxp_q4_from_int(10);
+
+	if (limits->link.min_bpp_x16 >= min_bpp_x16)
+		return true;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to " FXP_Q4_FMT " in DSC mode due to hblank expansion quirk\n",
+		    crtc->base.base.id, crtc->base.name,
+		    connector->base.base.id, connector->base.name,
+		    FXP_Q4_ARGS(min_bpp_x16));
+
+	if (limits->link.max_bpp_x16 < min_bpp_x16)
+		return false;
+
+	limits->link.min_bpp_x16 = min_bpp_x16;
+
+	return true;
+}
+
+static bool
+intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
+				   const struct intel_connector *connector,
+				   struct intel_crtc_state *crtc_state,
+				   bool dsc,
+				   struct link_config_limits *limits)
+{
+	/*
+	 * for MST we always configure max link bw - the spec doesn't
+	 * seem to suggest we should do otherwise.
+	 */
+	limits->min_rate = limits->max_rate =
+		intel_dp_max_link_rate(intel_dp);
+
+	limits->min_lane_count = limits->max_lane_count =
+		intel_dp_max_lane_count(intel_dp);
+
+	limits->pipe.min_bpp = intel_dp_min_bpp(crtc_state->output_format);
+	/*
+	 * FIXME: If all the streams can't fit into the link with
+	 * their current pipe_bpp we should reduce pipe_bpp across
+	 * the board until things start to fit. Until then we
+	 * limit to <= 8bpc since that's what was hardcoded for all
+	 * MST streams previously. This hack should be removed once
+	 * we have the proper retry logic in place.
+	 */
+	limits->pipe.max_bpp = min(crtc_state->pipe_bpp, 24);
+
+	intel_dp_test_compute_config(intel_dp, crtc_state, limits);
+
+	if (!intel_dp_compute_config_link_bpp_limits(intel_dp,
+						     crtc_state,
+						     dsc,
+						     limits))
+		return false;
+
+	return adjust_limits_for_dsc_hblank_expansion_quirk(connector,
+							    crtc_state,
+							    limits,
+							    dsc);
+}
+
+static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *pipe_config,
+				       struct drm_connector_state *conn_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	const struct drm_display_mode *adjusted_mode =
+		&pipe_config->hw.adjusted_mode;
+	struct link_config_limits limits;
+	bool dsc_needed, joiner_needs_dsc;
+	int num_joined_pipes;
+	int ret = 0;
+
+	if (pipe_config->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, connector, pipe_config))
+		return -EINVAL;
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
+		return -EINVAL;
+
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, connector,
+						     adjusted_mode->crtc_hdisplay,
+						     adjusted_mode->crtc_clock);
+	if (num_joined_pipes > 1)
+		pipe_config->joiner_pipes = GENMASK(crtc->pipe + num_joined_pipes - 1, crtc->pipe);
+
+	pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
+	pipe_config->has_pch_encoder = false;
+
+	joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes);
+
+	dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
+		     !intel_dp_mst_compute_config_limits(intel_dp,
+							 connector,
+							 pipe_config,
+							 false,
+							 &limits);
+
+	if (!dsc_needed) {
+		ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
+						       conn_state, &limits);
+
+		if (ret == -EDEADLK)
+			return ret;
+
+		if (ret)
+			dsc_needed = true;
+	}
+
+	/* enable compression if the mode doesn't fit available BW */
+	if (dsc_needed) {
+		drm_dbg_kms(&dev_priv->drm, "Try DSC (fallback=%s, joiner=%s, force=%s)\n",
+			    str_yes_no(ret), str_yes_no(joiner_needs_dsc),
+			    str_yes_no(intel_dp->force_dsc_en));
+
+		if (!intel_dp_supports_dsc(connector, pipe_config))
+			return -EINVAL;
+
+		if (!intel_dp_mst_compute_config_limits(intel_dp,
+							connector,
+							pipe_config,
+							true,
+							&limits))
+			return -EINVAL;
+
+		/*
+		 * FIXME: As bpc is hardcoded to 8, as mentioned above,
+		 * WARN and ignore the debug flag force_dsc_bpc for now.
+		 */
+		drm_WARN(&dev_priv->drm, intel_dp->force_dsc_bpc, "Cannot Force BPC for MST\n");
+		/*
+		 * Try to get at least some timeslots and then see, if
+		 * we can fit there with DSC.
+		 */
+		drm_dbg_kms(&dev_priv->drm, "Trying to find VCPI slots in DSC mode\n");
+
+		ret = intel_dp_dsc_mst_compute_link_config(encoder, pipe_config,
+							   conn_state, &limits);
+		if (ret < 0)
+			return ret;
+
+		ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
+						  conn_state, &limits,
+						  pipe_config->dp_m_n.tu, false);
+	}
+
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_update_slots(encoder, pipe_config, conn_state);
+	if (ret)
+		return ret;
+
+	pipe_config->limited_color_range =
+		intel_dp_limited_color_range(pipe_config, conn_state);
+
+	if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
+		pipe_config->lane_lat_optim_mask =
+			bxt_dpio_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
+
+	intel_dp_audio_compute_config(encoder, pipe_config, conn_state);
+
+	intel_ddi_compute_min_voltage_level(pipe_config);
+
+	intel_psr_compute_config(intel_dp, pipe_config, conn_state);
+
+	return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
+							pipe_config);
+}
+
+/*
+ * Iterate over all connectors and return a mask of
+ * all CPU transcoders streaming over the same DP link.
+ */
+static unsigned int
+intel_dp_mst_transcoder_mask(struct intel_atomic_state *state,
+			     struct intel_dp *mst_port)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 transcoders = 0;
+	int i;
+
+	if (DISPLAY_VER(dev_priv) < 12)
+		return 0;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		const struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector->mst_port != mst_port || !conn_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_state->base.crtc);
+		crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+		if (!crtc_state->hw.active)
+			continue;
+
+		transcoders |= BIT(crtc_state->cpu_transcoder);
+	}
+
+	return transcoders;
+}
+
+static u8 get_pipes_downstream_of_mst_port(struct intel_atomic_state *state,
+					   struct drm_dp_mst_topology_mgr *mst_mgr,
+					   struct drm_dp_mst_port *parent_port)
+{
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 mask = 0;
+	int i;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		if (!conn_state->base.crtc)
+			continue;
+
+		if (&connector->mst_port->mst_mgr != mst_mgr)
+			continue;
+
+		if (connector->port != parent_port &&
+		    !drm_dp_mst_port_downstream_of_parent(mst_mgr,
+							  connector->port,
+							  parent_port))
+			continue;
+
+		mask |= BIT(to_intel_crtc(conn_state->base.crtc)->pipe);
+	}
+
+	return mask;
+}
+
+static int intel_dp_mst_check_fec_change(struct intel_atomic_state *state,
+					 struct drm_dp_mst_topology_mgr *mst_mgr,
+					 struct intel_link_bw_limits *limits)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+	u8 mst_pipe_mask;
+	u8 fec_pipe_mask = 0;
+	int ret;
+
+	mst_pipe_mask = get_pipes_downstream_of_mst_port(state, mst_mgr, NULL);
+
+	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, mst_pipe_mask) {
+		struct intel_crtc_state *crtc_state =
+			intel_atomic_get_new_crtc_state(state, crtc);
+
+		/* Atomic connector check should've added all the MST CRTCs. */
+		if (drm_WARN_ON(&i915->drm, !crtc_state))
+			return -EINVAL;
+
+		if (crtc_state->fec_enable)
+			fec_pipe_mask |= BIT(crtc->pipe);
+	}
+
+	if (!fec_pipe_mask || mst_pipe_mask == fec_pipe_mask)
+		return 0;
+
+	limits->force_fec_pipes |= mst_pipe_mask;
+
+	ret = intel_modeset_pipes_in_mask_early(state, "MST FEC",
+						mst_pipe_mask);
+
+	return ret ? : -EAGAIN;
+}
+
+static int intel_dp_mst_check_bw(struct intel_atomic_state *state,
+				 struct drm_dp_mst_topology_mgr *mst_mgr,
+				 struct drm_dp_mst_topology_state *mst_state,
+				 struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_port *mst_port;
+	u8 mst_port_pipes;
+	int ret;
+
+	ret = drm_dp_mst_atomic_check_mgr(&state->base, mst_mgr, mst_state, &mst_port);
+	if (ret != -ENOSPC)
+		return ret;
+
+	mst_port_pipes = get_pipes_downstream_of_mst_port(state, mst_mgr, mst_port);
+
+	ret = intel_link_bw_reduce_bpp(state, limits,
+				       mst_port_pipes, "MST link BW");
+
+	return ret ? : -EAGAIN;
+}
+
+/**
+ * intel_dp_mst_atomic_check_link - check all modeset MST link configuration
+ * @state: intel atomic state
+ * @limits: link BW limits
+ *
+ * Check the link configuration for all modeset MST outputs. If the
+ * configuration is invalid @limits will be updated if possible to
+ * reduce the total BW, after which the configuration for all CRTCs in
+ * @state must be recomputed with the updated @limits.
+ *
+ * Returns:
+ *   - 0 if the confugration is valid
+ *   - %-EAGAIN, if the configuration is invalid and @limits got updated
+ *     with fallback values with which the configuration of all CRTCs in
+ *     @state must be recomputed
+ *   - Other negative error, if the configuration is invalid without a
+ *     fallback possibility, or the check failed for another reason
+ */
+int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
+				   struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_dp_mst_topology_state *mst_state;
+	int ret;
+	int i;
+
+	for_each_new_mst_mgr_in_state(&state->base, mgr, mst_state, i) {
+		ret = intel_dp_mst_check_fec_change(state, mgr, limits);
+		if (ret)
+			return ret;
+
+		ret = intel_dp_mst_check_bw(state, mgr, mst_state,
+					    limits);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int intel_dp_mst_compute_config_late(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state,
+					    struct drm_connector_state *conn_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	/* lowest numbered transcoder will be designated master */
+	crtc_state->mst_master_transcoder =
+		ffs(intel_dp_mst_transcoder_mask(state, intel_dp)) - 1;
+
+	return 0;
+}
+
+/*
+ * If one of the connectors in a MST stream needs a modeset, mark all CRTCs
+ * that shares the same MST stream as mode changed,
+ * intel_modeset_pipe_config()+intel_crtc_check_fastset() will take care to do
+ * a fastset when possible.
+ *
+ * On TGL+ this is required since each stream go through a master transcoder,
+ * so if the master transcoder needs modeset, all other streams in the
+ * topology need a modeset. All platforms need to add the atomic state
+ * for all streams in the topology, since a modeset on one may require
+ * changing the MST link BW usage of the others, which in turn needs a
+ * recomputation of the corresponding CRTC states.
+ */
+static int
+intel_dp_mst_atomic_topology_check(struct intel_connector *connector,
+				   struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct drm_connector_list_iter connector_list_iter;
+	struct intel_connector *connector_iter;
+	int ret = 0;
+
+	if (!intel_connector_needs_modeset(state, &connector->base))
+		return 0;
+
+	drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
+	for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
+		struct intel_digital_connector_state *conn_iter_state;
+		struct intel_crtc_state *crtc_state;
+		struct intel_crtc *crtc;
+
+		if (connector_iter->mst_port != connector->mst_port ||
+		    connector_iter == connector)
+			continue;
+
+		conn_iter_state = intel_atomic_get_digital_connector_state(state,
+									   connector_iter);
+		if (IS_ERR(conn_iter_state)) {
+			ret = PTR_ERR(conn_iter_state);
+			break;
+		}
+
+		if (!conn_iter_state->base.crtc)
+			continue;
+
+		crtc = to_intel_crtc(conn_iter_state->base.crtc);
+		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+		if (IS_ERR(crtc_state)) {
+			ret = PTR_ERR(crtc_state);
+			break;
+		}
+
+		ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
+		if (ret)
+			break;
+		crtc_state->uapi.mode_changed = true;
+	}
+	drm_connector_list_iter_end(&connector_list_iter);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_atomic_check(struct drm_connector *connector,
+			  struct drm_atomic_state *_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(_state);
+	struct intel_connector *intel_connector =
+		to_intel_connector(connector);
+	int ret;
+
+	ret = intel_digital_connector_atomic_check(connector, &state->base);
+	if (ret)
+		return ret;
+
+	ret = intel_dp_mst_atomic_topology_check(intel_connector, state);
+	if (ret)
+		return ret;
+
+	if (intel_connector_needs_modeset(state, connector)) {
+		ret = intel_dp_tunnel_atomic_check_state(state,
+							 intel_connector->mst_port,
+							 intel_connector);
+		if (ret)
+			return ret;
+	}
+
+	return drm_dp_atomic_release_time_slots(&state->base,
+						&intel_connector->mst_port->mst_mgr,
+						intel_connector->port);
+}
+
+static void clear_act_sent(struct intel_encoder *encoder,
+			   const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	intel_de_write(i915, dp_tp_status_reg(encoder, crtc_state),
+		       DP_TP_STATUS_ACT_SENT);
+}
+
+static void wait_for_act_sent(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_dp *intel_dp = &intel_mst->primary->dp;
+
+	if (intel_de_wait_for_set(i915, dp_tp_status_reg(encoder, crtc_state),
+				  DP_TP_STATUS_ACT_SENT, 1))
+		drm_err(&i915->drm, "Timed out waiting for ACT sent\n");
+
+	drm_dp_check_act_status(&intel_dp->mst_mgr);
+}
+
+static void intel_mst_disable_dp(struct intel_atomic_state *state,
+				 struct intel_encoder *encoder,
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+
+	drm_dbg_kms(&i915->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (intel_dp->active_mst_links == 1)
+		intel_dp->link_trained = false;
+
+	intel_hdcp_disable(intel_mst->connector);
+
+	intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
+}
+
+static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
+				      struct intel_encoder *encoder,
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct drm_connector_state *old_conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_dp_mst_topology_state *old_mst_state =
+		drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	struct drm_dp_mst_topology_state *new_mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	const struct drm_dp_mst_atomic_payload *old_payload =
+		drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
+	struct drm_dp_mst_atomic_payload *new_payload =
+		drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_crtc *pipe_crtc;
+	bool last_mst_stream;
+	int i;
+
+	intel_dp->active_mst_links--;
+	last_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && last_mst_stream &&
+		    !intel_dp_mst_is_master_trans(old_crtc_state));
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_off(old_pipe_crtc_state);
+	}
+
+	intel_disable_transcoder(old_crtc_state);
+
+	drm_dp_remove_payload_part1(&intel_dp->mst_mgr, new_mst_state, new_payload);
+
+	clear_act_sent(encoder, old_crtc_state);
+
+	intel_de_rmw(dev_priv,
+		     TRANS_DDI_FUNC_CTL(dev_priv, old_crtc_state->cpu_transcoder),
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC, 0);
+
+	wait_for_act_sent(encoder, old_crtc_state);
+
+	drm_dp_remove_payload_part2(&intel_dp->mst_mgr, new_mst_state,
+				    old_payload, new_payload);
+
+	intel_ddi_disable_transcoder_func(old_crtc_state);
+
+	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
+		const struct intel_crtc_state *old_pipe_crtc_state =
+			intel_atomic_get_old_crtc_state(state, pipe_crtc);
+
+		intel_dsc_disable(old_pipe_crtc_state);
+
+		if (DISPLAY_VER(dev_priv) >= 9)
+			skl_scaler_disable(old_pipe_crtc_state);
+		else
+			ilk_pfit_disable(old_pipe_crtc_state);
+	}
+
+	/*
+	 * Power down mst path before disabling the port, otherwise we end
+	 * up getting interrupts from the sink upon detecting link loss.
+	 */
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
+				     false);
+
+	/*
+	 * BSpec 4287: disable DIP after the transcoder is disabled and before
+	 * the transcoder clock select is set to none.
+	 */
+	intel_dp_set_infoframes(&dig_port->base, false,
+				old_crtc_state, NULL);
+	/*
+	 * From TGL spec: "If multi-stream slave transcoder: Configure
+	 * Transcoder Clock Select to direct no clock to the transcoder"
+	 *
+	 * From older GENs spec: "Configure Transcoder Clock Select to direct
+	 * no clock to the transcoder"
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !last_mst_stream)
+		intel_ddi_disable_transcoder_clock(old_crtc_state);
+
+
+	intel_mst->connector = NULL;
+	if (last_mst_stream)
+		dig_port->base.post_disable(state, &dig_port->base,
+						  old_crtc_state, NULL);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+}
+
+static void intel_mst_post_pll_disable_dp(struct intel_atomic_state *state,
+					  struct intel_encoder *encoder,
+					  const struct intel_crtc_state *old_crtc_state,
+					  const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0 &&
+	    dig_port->base.post_pll_disable)
+		dig_port->base.post_pll_disable(state, encoder, old_crtc_state, old_conn_state);
+}
+
+static void intel_mst_pre_pll_enable_dp(struct intel_atomic_state *state,
+					struct intel_encoder *encoder,
+					const struct intel_crtc_state *pipe_config,
+					const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (intel_dp->active_mst_links == 0)
+		dig_port->base.pre_pll_enable(state, &dig_port->base,
+						    pipe_config, NULL);
+	else
+		/*
+		 * The port PLL state needs to get updated for secondary
+		 * streams as for the primary stream.
+		 */
+		intel_ddi_update_active_dpll(state, &dig_port->base,
+					     to_intel_crtc(pipe_config->uapi.crtc));
+}
+
+static bool intel_mst_probed_link_params_valid(struct intel_dp *intel_dp,
+					       int link_rate, int lane_count)
+{
+	return intel_dp->link.mst_probed_rate == link_rate &&
+		intel_dp->link.mst_probed_lane_count == lane_count;
+}
+
+static void intel_mst_set_probed_link_params(struct intel_dp *intel_dp,
+					     int link_rate, int lane_count)
+{
+	intel_dp->link.mst_probed_rate = link_rate;
+	intel_dp->link.mst_probed_lane_count = lane_count;
+}
+
+static void intel_mst_reprobe_topology(struct intel_dp *intel_dp,
+				       const struct intel_crtc_state *crtc_state)
+{
+	if (intel_mst_probed_link_params_valid(intel_dp,
+					       crtc_state->port_clock, crtc_state->lane_count))
+		return;
+
+	drm_dp_mst_topology_queue_probe(&intel_dp->mst_mgr);
+
+	intel_mst_set_probed_link_params(intel_dp,
+					 crtc_state->port_clock, crtc_state->lane_count);
+}
+
+static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
+				    struct intel_encoder *encoder,
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	int ret;
+	bool first_mst_stream;
+
+	/* MST encoders are bound to a crtc, not to a connector,
+	 * force the mapping here for get_hw_state.
+	 */
+	connector->encoder = encoder;
+	intel_mst->connector = connector;
+	first_mst_stream = intel_dp->active_mst_links == 0;
+	drm_WARN_ON(&dev_priv->drm,
+		    DISPLAY_VER(dev_priv) >= 12 && first_mst_stream &&
+		    !intel_dp_mst_is_master_trans(pipe_config));
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	if (first_mst_stream)
+		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
+
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
+
+	intel_dp_sink_enable_decompression(state, connector, pipe_config);
+
+	if (first_mst_stream) {
+		dig_port->base.pre_enable(state, &dig_port->base,
+						pipe_config, NULL);
+
+		intel_mst_reprobe_topology(intel_dp, pipe_config);
+	}
+
+	intel_dp->active_mst_links++;
+
+	ret = drm_dp_add_payload_part1(&intel_dp->mst_mgr, mst_state,
+				       drm_atomic_get_mst_payload_state(mst_state, connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	/*
+	 * Before Gen 12 this is not done as part of
+	 * dig_port->base.pre_enable() and should be done here. For
+	 * Gen 12+ the step in which this should be done is different for the
+	 * first MST stream, so it's done on the DDI for the first stream and
+	 * here for the following ones.
+	 */
+	if (DISPLAY_VER(dev_priv) < 12 || !first_mst_stream)
+		intel_ddi_enable_transcoder_clock(encoder, pipe_config);
+
+	intel_dsc_dp_pps_write(&dig_port->base, pipe_config);
+	intel_ddi_set_dp_msa(pipe_config, conn_state);
+}
+
+static void enable_bs_jitter_was(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	u32 clear = 0;
+	u32 set = 0;
+
+	if (!IS_ALDERLAKE_P(i915))
+		return;
+
+	if (!IS_DISPLAY_STEP(i915, STEP_D0, STEP_FOREVER))
+		return;
+
+	/* Wa_14013163432:adlp */
+	if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+		set |= DP_MST_FEC_BS_JITTER_WA(crtc_state->cpu_transcoder);
+
+	/* Wa_14014143976:adlp */
+	if (IS_DISPLAY_STEP(i915, STEP_E0, STEP_FOREVER)) {
+		if (intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+		else if (crtc_state->fec_enable)
+			clear |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
+
+		if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
+			set |= DP_MST_DPT_DPTP_ALIGN_WA(crtc_state->cpu_transcoder);
+	}
+
+	if (!clear && !set)
+		return;
+
+	intel_de_rmw(i915, CHICKEN_MISC_3, clear, set);
+}
+
+static void intel_mst_enable_dp(struct intel_atomic_state *state,
+				struct intel_encoder *encoder,
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct intel_connector *connector = to_intel_connector(conn_state->connector);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct drm_dp_mst_topology_state *mst_state =
+		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	enum transcoder trans = pipe_config->cpu_transcoder;
+	bool first_mst_stream = intel_dp->active_mst_links == 1;
+	struct intel_crtc *pipe_crtc;
+	int ret, i;
+
+	drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
+
+	if (intel_dp_is_uhbr(pipe_config)) {
+		const struct drm_display_mode *adjusted_mode =
+			&pipe_config->hw.adjusted_mode;
+		u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+		intel_de_write(dev_priv, TRANS_DP2_VFREQHIGH(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+		intel_de_write(dev_priv, TRANS_DP2_VFREQLOW(pipe_config->cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+	}
+
+	enable_bs_jitter_was(pipe_config);
+
+	intel_ddi_enable_transcoder_func(encoder, pipe_config);
+
+	clear_act_sent(encoder, pipe_config);
+
+	intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(dev_priv, trans), 0,
+		     TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+
+	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
+		    intel_dp->active_mst_links);
+
+	wait_for_act_sent(encoder, pipe_config);
+
+	if (first_mst_stream)
+		intel_ddi_wait_for_fec_status(encoder, pipe_config, true);
+
+	ret = drm_dp_add_payload_part2(&intel_dp->mst_mgr,
+				       drm_atomic_get_mst_payload_state(mst_state,
+									connector->port));
+	if (ret < 0)
+		intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
+
+	if (DISPLAY_VER(dev_priv) >= 12)
+		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, trans),
+			     FECSTALL_DIS_DPTSTREAM_DPTTG,
+			     pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
+
+	intel_audio_sdp_split_update(pipe_config);
+
+	intel_enable_transcoder(pipe_config);
+
+	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, pipe_config, i) {
+		const struct intel_crtc_state *pipe_crtc_state =
+			intel_atomic_get_new_crtc_state(state, pipe_crtc);
+
+		intel_crtc_vblank_on(pipe_crtc_state);
+	}
+
+	intel_hdcp_enable(state, encoder, pipe_config, conn_state);
+}
+
+static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
+				      enum pipe *pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	*pipe = intel_mst->pipe;
+	if (intel_mst->connector)
+		return true;
+	return false;
+}
+
+static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
+					struct intel_crtc_state *pipe_config)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	dig_port->base.get_config(&dig_port->base, pipe_config);
+}
+
+static bool intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder,
+					       struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	return intel_dp_initial_fastset_check(&dig_port->base, crtc_state);
+}
+
+static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_i915_private *i915 = to_i915(intel_connector->base.dev);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	const struct drm_edid *drm_edid;
+	int ret;
+
+	if (drm_connector_is_unregistered(connector))
+		return intel_connector_update_modes(connector, NULL);
+
+	if (!intel_display_driver_check_access(i915))
+		return drm_edid_connector_add_modes(connector);
+
+	drm_edid = drm_dp_mst_edid_read(connector, &intel_dp->mst_mgr, intel_connector->port);
+
+	ret = intel_connector_update_modes(connector, drm_edid);
+
+	drm_edid_free(drm_edid);
+
+	return ret;
+}
+
+static int
+intel_dp_mst_connector_late_register(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	int ret;
+
+	ret = drm_dp_mst_connector_late_register(connector,
+						 intel_connector->port);
+	if (ret < 0)
+		return ret;
+
+	ret = intel_connector_register(connector);
+	if (ret < 0)
+		drm_dp_mst_connector_early_unregister(connector,
+						      intel_connector->port);
+
+	return ret;
+}
+
+static void
+intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+
+	intel_connector_unregister(connector);
+	drm_dp_mst_connector_early_unregister(connector,
+					      intel_connector->port);
+}
+
+static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.atomic_get_property = intel_digital_connector_atomic_get_property,
+	.atomic_set_property = intel_digital_connector_atomic_set_property,
+	.late_register = intel_dp_mst_connector_late_register,
+	.early_unregister = intel_dp_mst_connector_early_unregister,
+	.destroy = intel_connector_destroy,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_duplicate_state = intel_digital_connector_duplicate_state,
+};
+
+static int intel_dp_mst_get_modes(struct drm_connector *connector)
+{
+	return intel_dp_mst_get_ddc_modes(connector);
+}
+
+static int
+intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
+			    struct drm_display_mode *mode,
+			    struct drm_modeset_acquire_ctx *ctx,
+			    enum drm_mode_status *status)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+	struct drm_dp_mst_port *port = intel_connector->port;
+	const int min_bpp = 18;
+	int max_dotclk = to_i915(connector->dev)->display.cdclk.max_dotclk_freq;
+	int max_rate, mode_rate, max_lanes, max_link_clock;
+	int ret;
+	bool dsc = false;
+	u16 dsc_max_compressed_bpp = 0;
+	u8 dsc_slice_count = 0;
+	int target_clock = mode->clock;
+	int num_joined_pipes;
+
+	if (drm_connector_is_unregistered(connector)) {
+		*status = MODE_ERROR;
+		return 0;
+	}
+
+	*status = intel_cpu_transcoder_mode_valid(dev_priv, mode);
+	if (*status != MODE_OK)
+		return 0;
+
+	if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
+		*status = MODE_H_ILLEGAL;
+		return 0;
+	}
+
+	if (mode->clock < 10000) {
+		*status = MODE_CLOCK_LOW;
+		return 0;
+	}
+
+	max_link_clock = intel_dp_max_link_rate(intel_dp);
+	max_lanes = intel_dp_max_lane_count(intel_dp);
+
+	max_rate = intel_dp_max_link_data_rate(intel_dp,
+					       max_link_clock, max_lanes);
+	mode_rate = intel_dp_link_required(mode->clock, min_bpp);
+
+	/*
+	 * TODO:
+	 * - Also check if compression would allow for the mode
+	 * - Calculate the overhead using drm_dp_bw_overhead() /
+	 *   drm_dp_bw_channel_coding_efficiency(), similarly to the
+	 *   compute config code, as drm_dp_calc_pbn_mode() doesn't
+	 *   account with all the overheads.
+	 * - Check here and during compute config the BW reported by
+	 *   DFP_Link_Available_Payload_Bandwidth_Number (or the
+	 *   corresponding link capabilities of the sink) in case the
+	 *   stream is uncompressed for it by the last branch device.
+	 */
+	num_joined_pipes = intel_dp_num_joined_pipes(intel_dp, intel_connector,
+						     mode->hdisplay, target_clock);
+	max_dotclk *= num_joined_pipes;
+
+	ret = drm_modeset_lock(&mgr->base.lock, ctx);
+	if (ret)
+		return ret;
+
+	if (mode_rate > max_rate || mode->clock > max_dotclk ||
+	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (intel_dp_has_dsc(intel_connector)) {
+		/*
+		 * TBD pass the connector BPC,
+		 * for now U8_MAX so that max BPC on that platform would be picked
+		 */
+		int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_connector, U8_MAX);
+
+		if (drm_dp_sink_supports_fec(intel_connector->dp.fec_capability)) {
+			dsc_max_compressed_bpp =
+				intel_dp_dsc_get_max_compressed_bpp(dev_priv,
+								    max_link_clock,
+								    max_lanes,
+								    target_clock,
+								    mode->hdisplay,
+								    num_joined_pipes,
+								    INTEL_OUTPUT_FORMAT_RGB,
+								    pipe_bpp, 64);
+			dsc_slice_count =
+				intel_dp_dsc_get_slice_count(intel_connector,
+							     target_clock,
+							     mode->hdisplay,
+							     num_joined_pipes);
+		}
+
+		dsc = dsc_max_compressed_bpp && dsc_slice_count;
+	}
+
+	if (intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes) && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	if (mode_rate > max_rate && !dsc) {
+		*status = MODE_CLOCK_HIGH;
+		return 0;
+	}
+
+	*status = intel_mode_valid_max_plane_size(dev_priv, mode, num_joined_pipes);
+	return 0;
+}
+
+static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
+							 struct drm_atomic_state *state)
+{
+	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
+											 connector);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+	struct intel_crtc *crtc = to_intel_crtc(connector_state->crtc);
+
+	return &intel_dp->mst_encoders[crtc->pipe]->base.base;
+}
+
+static int
+intel_dp_mst_detect(struct drm_connector *connector,
+		    struct drm_modeset_acquire_ctx *ctx, bool force)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dp *intel_dp = intel_connector->mst_port;
+
+	if (!intel_display_device_enabled(i915))
+		return connector_status_disconnected;
+
+	if (drm_connector_is_unregistered(connector))
+		return connector_status_disconnected;
+
+	if (!intel_display_driver_check_access(i915))
+		return connector->status;
+
+	return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
+				      intel_connector->port);
+}
+
+static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
+	.get_modes = intel_dp_mst_get_modes,
+	.mode_valid_ctx = intel_dp_mst_mode_valid_ctx,
+	.atomic_best_encoder = intel_mst_atomic_best_encoder,
+	.atomic_check = intel_dp_mst_atomic_check,
+	.detect_ctx = intel_dp_mst_detect,
+};
+
+static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(to_intel_encoder(encoder));
+
+	drm_encoder_cleanup(encoder);
+	kfree(intel_mst);
+}
+
+static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
+	.destroy = intel_dp_mst_encoder_destroy,
+};
+
+static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
+{
+	if (intel_attached_encoder(connector) && connector->base.state->crtc) {
+		enum pipe pipe;
+		if (!intel_attached_encoder(connector)->get_hw_state(intel_attached_encoder(connector), &pipe))
+			return false;
+		return true;
+	}
+	return false;
+}
+
+static int intel_dp_mst_add_properties(struct intel_dp *intel_dp,
+				       struct drm_connector *connector,
+				       const char *pathprop)
+{
+	struct drm_i915_private *i915 = to_i915(connector->dev);
+
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.path_property, 0);
+	drm_object_attach_property(&connector->base,
+				   i915->drm.mode_config.tile_property, 0);
+
+	intel_attach_force_audio_property(connector);
+	intel_attach_broadcast_rgb_property(connector);
+
+	/*
+	 * Reuse the prop from the SST connector because we're
+	 * not allowed to create new props after device registration.
+	 */
+	connector->max_bpc_property =
+		intel_dp->attached_connector->base.max_bpc_property;
+	if (connector->max_bpc_property)
+		drm_connector_attach_max_bpc_property(connector, 6, 12);
+
+	return drm_connector_set_path_property(connector, pathprop);
+}
+
+static void
+intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
+					      struct intel_connector *connector)
+{
+	u8 dpcd_caps[DP_RECEIVER_CAP_SIZE];
+
+	if (!connector->dp.dsc_decompression_aux)
+		return;
+
+	if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
+		return;
+
+	intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], connector);
+}
+
+static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *connector)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct drm_dp_aux *aux = connector->dp.dsc_decompression_aux;
+	struct drm_dp_desc desc;
+	u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+	if (!aux)
+		return false;
+
+	/*
+	 * A logical port's OUI (at least for affected sinks) is all 0, so
+	 * instead of that the parent port's OUI is used for identification.
+	 */
+	if (drm_dp_mst_port_is_logical(connector->port)) {
+		aux = drm_dp_mst_aux_for_parent(connector->port);
+		if (!aux)
+			aux = &connector->mst_port->aux;
+	}
+
+	if (drm_dp_read_dpcd_caps(aux, dpcd) < 0)
+		return false;
+
+	if (drm_dp_read_desc(aux, &desc, drm_dp_is_branch(dpcd)) < 0)
+		return false;
+
+	if (!drm_dp_has_quirk(&desc,
+			      DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC))
+		return false;
+
+	/*
+	 * UHBR (MST sink) devices requiring this quirk don't advertise the
+	 * HBLANK expansion support. Presuming that they perform HBLANK
+	 * expansion internally, or are affected by this issue on modes with a
+	 * short HBLANK for other reasons.
+	 */
+	if (!drm_dp_128b132b_supported(dpcd) &&
+	    !(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE))
+		return false;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CONNECTOR:%d:%s] DSC HBLANK expansion quirk detected\n",
+		    connector->base.base.id, connector->base.name);
+
+	return true;
+}
+
+static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
+							struct drm_dp_mst_port *port,
+							const char *pathprop)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	enum pipe pipe;
+	int ret;
+
+	intel_connector = intel_connector_alloc();
+	if (!intel_connector)
+		return NULL;
+
+	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
+	intel_connector->sync_state = intel_dp_connector_sync_state;
+	intel_connector->mst_port = intel_dp;
+	intel_connector->port = port;
+	drm_dp_mst_get_port_malloc(port);
+
+	intel_dp_init_modeset_retry_work(intel_connector);
+
+	intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
+	intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
+	intel_connector->dp.dsc_hblank_expansion_quirk =
+		detect_dsc_hblank_expansion_quirk(intel_connector);
+
+	connector = &intel_connector->base;
+	ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret) {
+		drm_dp_mst_put_port_malloc(port);
+		intel_connector_free(intel_connector);
+		return NULL;
+	}
+
+	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
+
+	for_each_pipe(dev_priv, pipe) {
+		struct drm_encoder *enc =
+			&intel_dp->mst_encoders[pipe]->base.base;
+
+		ret = drm_connector_attach_encoder(&intel_connector->base, enc);
+		if (ret)
+			goto err;
+	}
+
+	ret = intel_dp_mst_add_properties(intel_dp, connector, pathprop);
+	if (ret)
+		goto err;
+
+	ret = intel_dp_hdcp_init(dig_port, intel_connector);
+	if (ret)
+		drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP MST init failed, skipping.\n",
+			    connector->name, connector->base.id);
+
+	return connector;
+
+err:
+	drm_connector_cleanup(connector);
+	return NULL;
+}
+
+static void
+intel_dp_mst_poll_hpd_irq(struct drm_dp_mst_topology_mgr *mgr)
+{
+	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+
+	intel_hpd_trigger_irq(dp_to_dig_port(intel_dp));
+}
+
+static const struct drm_dp_mst_topology_cbs mst_cbs = {
+	.add_connector = intel_dp_add_mst_connector,
+	.poll_hpd_irq = intel_dp_mst_poll_hpd_irq,
+};
+
+static struct intel_dp_mst_encoder *
+intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe pipe)
+{
+	struct intel_dp_mst_encoder *intel_mst;
+	struct intel_encoder *intel_encoder;
+	struct drm_device *dev = dig_port->base.base.dev;
+
+	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
+
+	if (!intel_mst)
+		return NULL;
+
+	intel_mst->pipe = pipe;
+	intel_encoder = &intel_mst->base;
+	intel_mst->primary = dig_port;
+
+	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
+			 DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
+
+	intel_encoder->type = INTEL_OUTPUT_DP_MST;
+	intel_encoder->power_domain = dig_port->base.power_domain;
+	intel_encoder->port = dig_port->base.port;
+	intel_encoder->cloneable = 0;
+	/*
+	 * This is wrong, but broken userspace uses the intersection
+	 * of possible_crtcs of all the encoders of a given connector
+	 * to figure out which crtcs can drive said connector. What
+	 * should be used instead is the union of possible_crtcs.
+	 * To keep such userspace functioning we must misconfigure
+	 * this to make sure the intersection is not empty :(
+	 */
+	intel_encoder->pipe_mask = ~0;
+
+	intel_encoder->compute_config = intel_dp_mst_compute_config;
+	intel_encoder->compute_config_late = intel_dp_mst_compute_config_late;
+	intel_encoder->disable = intel_mst_disable_dp;
+	intel_encoder->post_disable = intel_mst_post_disable_dp;
+	intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
+	intel_encoder->update_pipe = intel_ddi_update_pipe;
+	intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
+	intel_encoder->pre_enable = intel_mst_pre_enable_dp;
+	intel_encoder->enable = intel_mst_enable_dp;
+	intel_encoder->audio_enable = intel_audio_codec_enable;
+	intel_encoder->audio_disable = intel_audio_codec_disable;
+	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
+	intel_encoder->get_config = intel_dp_mst_enc_get_config;
+	intel_encoder->initial_fastset_check = intel_dp_mst_initial_fastset_check;
+
+	return intel_mst;
+
+}
+
+static bool
+intel_dp_create_fake_mst_encoders(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	enum pipe pipe;
+
+	for_each_pipe(dev_priv, pipe)
+		intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(dig_port, pipe);
+	return true;
+}
+
+int
+intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port)
+{
+	return dig_port->dp.active_mst_links;
+}
+
+int
+intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
+{
+	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	struct intel_dp *intel_dp = &dig_port->dp;
+	enum port port = dig_port->base.port;
+	int ret;
+
+	if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
+		return 0;
+
+	if (DISPLAY_VER(i915) < 12 && port == PORT_A)
+		return 0;
+
+	if (DISPLAY_VER(i915) < 11 && port == PORT_E)
+		return 0;
+
+	intel_dp->mst_mgr.cbs = &mst_cbs;
+
+	/* create encoders */
+	intel_dp_create_fake_mst_encoders(dig_port);
+	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
+					   &intel_dp->aux, 16, 3, conn_base_id);
+	if (ret) {
+		intel_dp->mst_mgr.cbs = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
+bool intel_dp_mst_source_support(struct intel_dp *intel_dp)
+{
+	return intel_dp->mst_mgr.cbs;
+}
+
+void
+intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port)
+{
+	struct intel_dp *intel_dp = &dig_port->dp;
+
+	if (!intel_dp_mst_source_support(intel_dp))
+		return;
+
+	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
+	/* encoders will get killed by normal cleanup */
+
+	intel_dp->mst_mgr.cbs = NULL;
+}
+
+bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
+}
+
+bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
+	       crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_connector - add MST topology state for a connector
+ * @state: atomic state
+ * @connector: connector to add the state for
+ * @crtc: the CRTC @connector is attached to
+ *
+ * Add the MST topology state for @connector to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+static int
+intel_dp_mst_add_topology_state_for_connector(struct intel_atomic_state *state,
+					      struct intel_connector *connector,
+					      struct intel_crtc *crtc)
+{
+	struct drm_dp_mst_topology_state *mst_state;
+
+	if (!connector->mst_port)
+		return 0;
+
+	mst_state = drm_atomic_get_mst_topology_state(&state->base,
+						      &connector->mst_port->mst_mgr);
+	if (IS_ERR(mst_state))
+		return PTR_ERR(mst_state);
+
+	mst_state->pending_crtc_mask |= drm_crtc_mask(&crtc->base);
+
+	return 0;
+}
+
+/**
+ * intel_dp_mst_add_topology_state_for_crtc - add MST topology state for a CRTC
+ * @state: atomic state
+ * @crtc: CRTC to add the state for
+ *
+ * Add the MST topology state for @crtc to @state.
+ *
+ * Returns 0 on success, negative error code on failure.
+ */
+int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
+					     struct intel_crtc *crtc)
+{
+	struct drm_connector *_connector;
+	struct drm_connector_state *conn_state;
+	int i;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		struct intel_connector *connector = to_intel_connector(_connector);
+		int ret;
+
+		if (conn_state->crtc != &crtc->base)
+			continue;
+
+		ret = intel_dp_mst_add_topology_state_for_connector(state, connector, crtc);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct intel_connector *
+get_connector_in_state_for_crtc(struct intel_atomic_state *state,
+				const struct intel_crtc *crtc)
+{
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector_state *new_conn_state;
+	struct drm_connector *_connector;
+	int i;
+
+	for_each_oldnew_connector_in_state(&state->base, _connector,
+					   old_conn_state, new_conn_state, i) {
+		struct intel_connector *connector =
+			to_intel_connector(_connector);
+
+		if (old_conn_state->crtc == &crtc->base ||
+		    new_conn_state->crtc == &crtc->base)
+			return connector;
+	}
+
+	return NULL;
+}
+
+/**
+ * intel_dp_mst_crtc_needs_modeset - check if changes in topology need to modeset the given CRTC
+ * @state: atomic state
+ * @crtc: CRTC for which to check the modeset requirement
+ *
+ * Check if any change in a MST topology requires a forced modeset on @crtc in
+ * this topology. One such change is enabling/disabling the DSC decompression
+ * state in the first branch device's UFP DPCD as required by one CRTC, while
+ * the other @crtc in the same topology is still active, requiring a full modeset
+ * on @crtc.
+ */
+bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state,
+				     struct intel_crtc *crtc)
+{
+	const struct intel_connector *crtc_connector;
+	const struct drm_connector_state *conn_state;
+	const struct drm_connector *_connector;
+	int i;
+
+	if (!intel_crtc_has_type(intel_atomic_get_new_crtc_state(state, crtc),
+				 INTEL_OUTPUT_DP_MST))
+		return false;
+
+	crtc_connector = get_connector_in_state_for_crtc(state, crtc);
+
+	if (!crtc_connector)
+		/* None of the connectors in the topology needs modeset */
+		return false;
+
+	for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
+		const struct intel_connector *connector =
+			to_intel_connector(_connector);
+		const struct intel_crtc_state *new_crtc_state;
+		const struct intel_crtc_state *old_crtc_state;
+		struct intel_crtc *crtc_iter;
+
+		if (connector->mst_port != crtc_connector->mst_port ||
+		    !conn_state->crtc)
+			continue;
+
+		crtc_iter = to_intel_crtc(conn_state->crtc);
+
+		new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc_iter);
+		old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc_iter);
+
+		if (!intel_crtc_needs_modeset(new_crtc_state))
+			continue;
+
+		if (old_crtc_state->dsc.compression_enable ==
+		    new_crtc_state->dsc.compression_enable)
+			continue;
+		/*
+		 * Toggling the decompression flag because of this stream in
+		 * the first downstream branch device's UFP DPCD may reset the
+		 * whole branch device. To avoid the reset while other streams
+		 * are also active modeset the whole MST topology in this
+		 * case.
+		 */
+		if (connector->dp.dsc_decompression_aux ==
+		    &connector->mst_port->aux)
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * intel_dp_mst_prepare_probe - Prepare an MST link for topology probing
+ * @intel_dp: DP port object
+ *
+ * Prepare an MST link for topology probing, programming the target
+ * link parameters to DPCD. This step is a requirement of the enumaration
+ * of path resources during probing.
+ */
+void intel_dp_mst_prepare_probe(struct intel_dp *intel_dp)
+{
+	int link_rate = intel_dp_max_link_rate(intel_dp);
+	int lane_count = intel_dp_max_lane_count(intel_dp);
+	u8 rate_select;
+	u8 link_bw;
+
+	if (intel_dp->link_trained)
+		return;
+
+	if (intel_mst_probed_link_params_valid(intel_dp, link_rate, lane_count))
+		return;
+
+	intel_dp_compute_rate(intel_dp, link_rate, &link_bw, &rate_select);
+
+	intel_dp_link_training_set_mode(intel_dp, link_rate, false);
+	intel_dp_link_training_set_bw(intel_dp, link_bw, rate_select, lane_count,
+				      drm_dp_enhanced_frame_cap(intel_dp->dpcd));
+
+	intel_mst_set_probed_link_params(intel_dp, link_rate, lane_count);
+}
+
+/*
+ * intel_dp_mst_verify_dpcd_state - verify the MST SW enabled state wrt. the DPCD
+ * @intel_dp: DP port object
+ *
+ * Verify if @intel_dp's MST enabled SW state matches the corresponding DPCD
+ * state. A long HPD pulse - not long enough to be detected as a disconnected
+ * state - could've reset the DPCD state, which requires tearing
+ * down/recreating the MST topology.
+ *
+ * Returns %true if the SW MST enabled and DPCD states match, %false
+ * otherwise.
+ */
+bool intel_dp_mst_verify_dpcd_state(struct intel_dp *intel_dp)
+{
+	struct intel_display *display = to_intel_display(intel_dp);
+	struct intel_connector *connector = intel_dp->attached_connector;
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct intel_encoder *encoder = &dig_port->base;
+	int ret;
+	u8 val;
+
+	if (!intel_dp->is_mst)
+		return true;
+
+	ret = drm_dp_dpcd_readb(intel_dp->mst_mgr.aux, DP_MSTM_CTRL, &val);
+
+	/* Adjust the expected register value for SST + SideBand. */
+	if (ret < 0 || val != (DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC)) {
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s][ENCODER:%d:%s] MST mode got reset, removing topology (ret=%d, ctrl=0x%02x)\n",
+			    connector->base.base.id, connector->base.name,
+			    encoder->base.base.id, encoder->base.name,
+			    ret, val);
+
+		return false;
+	}
+
+	return true;
+}