path: root/drivers/gpu/drm/i915/display/intel_encoder.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021 Intel Corporation
 */

#include "intel_atomic.h"
#include "intel_crtc.h"
#include "intel_ddi.h"
#include "intel_display_types.h"
#include "intel_display.h"
#include "intel_encoder.h"

static struct intel_connector *intel_encoder_find_connector(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct intel_connector *connector;

	for_each_connector_on_encoder(dev, &encoder->base, connector)
		return connector;

	return NULL;
}

/*
 * intel_connector_primary_encoder - get the primary encoder for a connector
 * @connector: connector for which to return the encoder
 *
 * Returns the primary encoder for a connector. There is a 1:1 mapping from
 * all connectors to their encoder, except for DP-MST connectors which have
 * both a virtual and a primary encoder. These DP-MST primary encoders can be
 * pointed to by as many DP-MST connectors as there are pipes.
 */
static struct intel_encoder *
intel_connector_primary_encoder(struct intel_connector *connector)
{
	struct intel_encoder *encoder;

	if (connector->mst_port)
		return &dp_to_dig_port(connector->mst_port)->base;

	encoder = intel_attached_encoder(connector);
	drm_WARN_ON(connector->base.dev, !encoder);

	return encoder;
}

void intel_encoders_update_prepare(struct intel_atomic_state *state)
{
	struct drm_connector_state *new_conn_state;
	struct drm_connector *connector;
	int i;

	for_each_new_connector_in_state(&state->base, connector, new_conn_state,
					i) {
		struct intel_connector *intel_connector;
		struct intel_encoder *encoder;
		struct intel_crtc *crtc;

		if (!intel_connector_needs_modeset(state, connector))
			continue;

		intel_connector = to_intel_connector(connector);
		encoder = intel_connector_primary_encoder(intel_connector);
		if (!encoder->update_prepare)
			continue;

		crtc = new_conn_state->crtc ?
			to_intel_crtc(new_conn_state->crtc) : NULL;
		encoder->update_prepare(state, encoder, crtc);
	}
}

void intel_encoders_update_complete(struct intel_atomic_state *state)
{
	struct drm_connector_state *new_conn_state;
	struct drm_connector *connector;
	int i;

	for_each_new_connector_in_state(&state->base, connector, new_conn_state,
					i) {
		struct intel_connector *intel_connector;
		struct intel_encoder *encoder;
		struct intel_crtc *crtc;

		if (!intel_connector_needs_modeset(state, connector))
			continue;

		intel_connector = to_intel_connector(connector);
		encoder = intel_connector_primary_encoder(intel_connector);
		if (!encoder->update_complete)
			continue;

		crtc = new_conn_state->crtc ?
			to_intel_crtc(new_conn_state->crtc) : NULL;
		encoder->update_complete(state, encoder, crtc);
	}
}

void intel_encoders_pre_pll_enable(struct intel_atomic_state *state,
				   struct intel_crtc *crtc)
{
	const struct intel_crtc_state *crtc_state =
		intel_atomic_get_new_crtc_state(state, crtc);
	const struct drm_connector_state *conn_state;
	struct drm_connector *conn;
	int i;

	for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(conn_state->best_encoder);

		if (conn_state->crtc != &crtc->base)
			continue;

		if (encoder->pre_pll_enable)
			encoder->pre_pll_enable(state, encoder,
						crtc_state, conn_state);
	}
}

void intel_encoders_pre_enable(struct intel_atomic_state *state,
			       struct intel_crtc *crtc)
{
	const struct intel_crtc_state *crtc_state =
		intel_atomic_get_new_crtc_state(state, crtc);
	const struct drm_connector_state *conn_state;
	struct drm_connector *conn;
	int i;

	for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(conn_state->best_encoder);

		if (conn_state->crtc != &crtc->base)
			continue;

		if (encoder->pre_enable)
			encoder->pre_enable(state, encoder,
					    crtc_state, conn_state);
	}
}

void intel_encoders_enable(struct intel_atomic_state *state,
			   struct intel_crtc *crtc)
{
	const struct intel_crtc_state *crtc_state =
		intel_atomic_get_new_crtc_state(state, crtc);
	const struct drm_connector_state *conn_state;
	struct drm_connector *conn;
	int i;

	for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(conn_state->best_encoder);

		if (conn_state->crtc != &crtc->base)
			continue;

		if (encoder->enable)
			encoder->enable(state, encoder,
					crtc_state, conn_state);
		intel_opregion_notify_encoder(encoder, true);
	}
}

void intel_encoders_pre_disable(struct intel_atomic_state *state,
				struct intel_crtc *crtc)
{
	const struct intel_crtc_state *old_crtc_state =
		intel_atomic_get_old_crtc_state(state, crtc);
	const struct drm_connector_state *old_conn_state;
	struct drm_connector *conn;
	int i;

	for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(old_conn_state->best_encoder);

		if (old_conn_state->crtc != &crtc->base)
			continue;

		if (encoder->pre_disable)
			encoder->pre_disable(state, encoder, old_crtc_state,
					     old_conn_state);
	}
}

void intel_encoders_disable(struct intel_atomic_state *state,
			    struct intel_crtc *crtc)
{
	const struct intel_crtc_state *old_crtc_state =
		intel_atomic_get_old_crtc_state(state, crtc);
	const struct drm_connector_state *old_conn_state;
	struct drm_connector *conn;
	int i;

	for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(old_conn_state->best_encoder);

		if (old_conn_state->crtc != &crtc->base)
			continue;

		intel_opregion_notify_encoder(encoder, false);
		if (encoder->disable)
			encoder->disable(state, encoder,
					 old_crtc_state, old_conn_state);
	}
}

void intel_encoders_post_disable(struct intel_atomic_state *state,
				 struct intel_crtc *crtc)
{
	const struct intel_crtc_state *old_crtc_state =
		intel_atomic_get_old_crtc_state(state, crtc);
	const struct drm_connector_state *old_conn_state;
	struct drm_connector *conn;
	int i;

	for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(old_conn_state->best_encoder);

		if (old_conn_state->crtc != &crtc->base)
			continue;

		if (encoder->post_disable)
			encoder->post_disable(state, encoder,
					      old_crtc_state, old_conn_state);
	}
}

void intel_encoders_post_pll_disable(struct intel_atomic_state *state,
				     struct intel_crtc *crtc)
{
	const struct intel_crtc_state *old_crtc_state =
		intel_atomic_get_old_crtc_state(state, crtc);
	const struct drm_connector_state *old_conn_state;
	struct drm_connector *conn;
	int i;

	for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(old_conn_state->best_encoder);

		if (old_conn_state->crtc != &crtc->base)
			continue;

		if (encoder->post_pll_disable)
			encoder->post_pll_disable(state, encoder,
						  old_crtc_state, old_conn_state);
	}
}

void intel_encoders_update_pipe(struct intel_atomic_state *state,
				struct intel_crtc *crtc)
{
	const struct intel_crtc_state *crtc_state =
		intel_atomic_get_new_crtc_state(state, crtc);
	const struct drm_connector_state *conn_state;
	struct drm_connector *conn;
	int i;

	for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
		struct intel_encoder *encoder =
			to_intel_encoder(conn_state->best_encoder);

		if (conn_state->crtc != &crtc->base)
			continue;

		if (encoder->update_pipe)
			encoder->update_pipe(state, encoder,
					     crtc_state, conn_state);
	}
}

static bool has_bogus_dpll_config(const struct intel_crtc_state *crtc_state)
{
	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

	/*
	 * Some SNB BIOSen (eg. ASUS K53SV) are known to misprogram
	 * the hardware when a high res displays plugged in. DPLL P
	 * divider is zero, and the pipe timings are bonkers. We'll
	 * try to disable everything in that case.
	 *
	 * FIXME would be nice to be able to sanitize this state
	 * without several WARNs, but for now let's take the easy
	 * road.
	 */
	return IS_SANDYBRIDGE(dev_priv) &&
		crtc_state->hw.active &&
		crtc_state->shared_dpll &&
		crtc_state->port_clock == 0;
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	struct intel_connector *connector;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct intel_crtc_state *crtc_state = crtc ?
		to_intel_crtc_state(crtc->base.state) : NULL;

	/* We need to check both for a crtc link (meaning that the
	 * encoder is active and trying to read from a pipe) and the
	 * pipe itself being active. */
	bool has_active_crtc = crtc_state &&
		crtc_state->hw.active;

	if (crtc_state && has_bogus_dpll_config(crtc_state)) {
		drm_dbg_kms(&dev_priv->drm,
			    "BIOS has misprogrammed the hardware. Disabling pipe %c\n",
			    pipe_name(crtc->pipe));
		has_active_crtc = false;
	}

	connector = intel_encoder_find_connector(encoder);
	if (connector && !has_active_crtc) {
		drm_dbg_kms(&dev_priv->drm,
			    "[ENCODER:%d:%s] has active connectors but no active pipe!\n",
			    encoder->base.base.id,
			    encoder->base.name);

		/* Connector is active, but has no active pipe. This is
		 * fallout from our resume register restoring. Disable
		 * the encoder manually again. */
		if (crtc_state) {
			struct drm_encoder *best_encoder;

			drm_dbg_kms(&dev_priv->drm,
				    "[ENCODER:%d:%s] manually disabled\n",
				    encoder->base.base.id,
				    encoder->base.name);

			/* avoid oopsing in case the hooks consult best_encoder */
			best_encoder = connector->base.state->best_encoder;
			connector->base.state->best_encoder = &encoder->base;

			/* FIXME NULL atomic state passed! */
			if (encoder->disable)
				encoder->disable(NULL, encoder, crtc_state,
						 connector->base.state);
			if (encoder->post_disable)
				encoder->post_disable(NULL, encoder, crtc_state,
						      connector->base.state);

			connector->base.state->best_encoder = best_encoder;
		}
		encoder->base.crtc = NULL;

		/* Inconsistent output/port/pipe state happens presumably due to
		 * a bug in one of the get_hw_state functions. Or someplace else
		 * in our code, like the register restore mess on resume. Clamp
		 * things to off as a safer default. */

		connector->base.dpms = DRM_MODE_DPMS_OFF;
		connector->base.encoder = NULL;
	}

	/* notify opregion of the sanitized encoder state */
	intel_opregion_notify_encoder(encoder, connector && has_active_crtc);

	if (HAS_DDI(dev_priv))
		intel_ddi_sanitize_encoder_pll_mapping(encoder);
}

void intel_encoders_sanitize(struct drm_i915_private *dev_priv)
{
	struct intel_encoder *encoder;
	for_each_intel_encoder(&dev_priv->drm, encoder)
		intel_sanitize_encoder(encoder);
}

static bool encoders_cloneable(const struct intel_encoder *a,
			       const struct intel_encoder *b)
{
	/* masks could be asymmetric, so check both ways */
	return a == b || (a->cloneable & (1 << b->type) &&
			  b->cloneable & (1 << a->type));
}

bool intel_encoders_check_single_cloning(struct intel_atomic_state *state,
					 struct intel_crtc *crtc,
					 struct intel_encoder *encoder)
{
	struct intel_encoder *source_encoder;
	struct drm_connector *connector;
	struct drm_connector_state *connector_state;
	int i;

	for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
		if (connector_state->crtc != &crtc->base)
			continue;

		source_encoder =
			to_intel_encoder(connector_state->best_encoder);
		if (!encoders_cloneable(encoder, source_encoder))
			return false;
	}

	return true;
}

static u32 intel_encoder_possible_clones(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct intel_encoder *source_encoder;
	u32 possible_clones = 0;

	for_each_intel_encoder(dev, source_encoder) {
		if (encoders_cloneable(encoder, source_encoder))
			possible_clones |= drm_encoder_mask(&source_encoder->base);
	}

	return possible_clones;
}

static u32 intel_encoder_possible_crtcs(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct intel_crtc *crtc;
	u32 possible_crtcs = 0;

	for_each_intel_crtc(dev, crtc) {
		if (encoder->pipe_mask & BIT(crtc->pipe))
			possible_crtcs |= drm_crtc_mask(&crtc->base);
	}

	return possible_crtcs;
}

void intel_encoders_fill_possible(struct drm_i915_private *dev_priv)
{
	struct intel_encoder *encoder;
	for_each_intel_encoder(&dev_priv->drm, encoder) {
		encoder->base.possible_crtcs =
			intel_encoder_possible_crtcs(encoder);
		encoder->base.possible_clones =
			intel_encoder_possible_clones(encoder);
	}
}

void intel_encoder_get_config(struct intel_encoder *encoder,
			      struct intel_crtc_state *crtc_state)
{
	encoder->get_config(encoder, crtc_state);

	intel_crtc_readout_derived_state(crtc_state);
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
	struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

	drm_encoder_cleanup(encoder);
	kfree(intel_encoder);
}

/* Returns the currently programmed mode of the given encoder. */
struct drm_display_mode *
intel_encoder_current_mode(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	struct intel_crtc_state *crtc_state;
	struct drm_display_mode *mode;
	struct intel_crtc *crtc;
	enum pipe pipe;

	if (!encoder->get_hw_state(encoder, &pipe))
		return NULL;

	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

	mode = kzalloc(sizeof(*mode), GFP_KERNEL);
	if (!mode)
		return NULL;

	crtc_state = intel_crtc_state_alloc(crtc);
	if (!crtc_state) {
		kfree(mode);
		return NULL;
	}

	if (!intel_crtc_get_pipe_config(crtc_state)) {
		kfree(crtc_state);
		kfree(mode);
		return NULL;
	}

	intel_encoder_get_config(encoder, crtc_state);

	intel_mode_from_crtc_timings(mode, &crtc_state->hw.adjusted_mode);

	kfree(crtc_state);

	return mode;
}

void intel_encoders_get_power_domains(struct drm_i915_private *dev_priv)
{
	struct intel_encoder *encoder;

	for_each_intel_encoder(&dev_priv->drm, encoder) {
		struct intel_crtc_state *crtc_state;

		if (!encoder->get_power_domains)
			continue;

		/*
		 * MST-primary and inactive encoders don't have a crtc state
		 * and neither of these require any power domain references.
		 */
		if (!encoder->base.crtc)
			continue;

		crtc_state = to_intel_crtc_state(encoder->base.crtc->state);
		encoder->get_power_domains(encoder, crtc_state);
	}
}