From 376a33c4a0d8344bb575e1a6eeb748ee4d4675d3 Mon Sep 17 00:00:00 2001 From: Suraj Kandpal Date: Mon, 4 Nov 2024 09:29:51 +0530 Subject: drm/i915/hdcp: Fix when the first read and write are retried Make sure that the first read/write in hdcp2_authentication_key_exchange are only retried when we have either DP/DPMST encoder connected, since we do this to give docks and dp encoders some extra time to get their HDCP DPCD registers ready only for DP/DPMST encoders as this issue is only observed here no need to burden other encoders with extra retries as this causes the HDMI connector to have some other timing issue and fails HDCP authentication. --v2 -Add intent of patch [Chaitanya] -Add reasoning for loop [Jani] -Make sure we forfiet the 50ms wait for non DP/DPMST encoders. --v3 -Remove the is_dp_encoder check [Jani/Chaitanya] -Make the commit message more clearer [Jani] Fixes: 9d5a05f86d2f ("drm/i915/hdcp: Retry first read and writes to downstream") Signed-off-by: Suraj Kandpal Reviewed-by: Chaitanya Kumar Borah Link: https://patchwork.freedesktop.org/patch/msgid/20241104035951.517837-1-suraj.kandpal@intel.com (cherry picked from commit 44499559496c1dac43583f4387d38de1b612a69b) Signed-off-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/display/intel_hdcp.c | 32 +++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c index f6d42ec6949e..f57e4dba2873 100644 --- a/drivers/gpu/drm/i915/display/intel_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c @@ -1503,6 +1503,8 @@ static int hdcp2_deauthenticate_port(struct intel_connector *connector) static int hdcp2_authentication_key_exchange(struct intel_connector *connector) { struct intel_display *display = to_intel_display(connector); + struct intel_digital_port *dig_port = + intel_attached_dig_port(connector); struct intel_hdcp *hdcp = &connector->hdcp; union { struct hdcp2_ake_init ake_init; @@ -1513,30 +1515,36 @@ static int hdcp2_authentication_key_exchange(struct intel_connector *connector) } msgs; const struct intel_hdcp_shim *shim = hdcp->shim; size_t size; - int ret, i; + int ret, i, max_retries; /* Init for seq_num */ hdcp->seq_num_v = 0; hdcp->seq_num_m = 0; + if (intel_encoder_is_dp(&dig_port->base) || + intel_encoder_is_mst(&dig_port->base)) + max_retries = 10; + else + max_retries = 1; + ret = hdcp2_prepare_ake_init(connector, &msgs.ake_init); if (ret < 0) return ret; /* * Retry the first read and write to downstream at least 10 times - * with a 50ms delay if not hdcp2 capable(dock decides to stop advertising - * hdcp2 capability for some reason). The reason being that - * during suspend resume dock usually keeps the HDCP2 registers inaccesible - * causing AUX error. This wouldn't be a big problem if the userspace - * just kept retrying with some delay while it continues to play low - * value content but most userpace applications end up throwing an error - * when it receives one from KMD. This makes sure we give the dock - * and the sink devices to complete its power cycle and then try HDCP - * authentication. The values of 10 and delay of 50ms was decided based - * on multiple trial and errors. + * with a 50ms delay if not hdcp2 capable for DP/DPMST encoders + * (dock decides to stop advertising hdcp2 capability for some reason). + * The reason being that during suspend resume dock usually keeps the + * HDCP2 registers inaccesible causing AUX error. This wouldn't be a + * big problem if the userspace just kept retrying with some delay while + * it continues to play low value content but most userpace applications + * end up throwing an error when it receives one from KMD. This makes + * sure we give the dock and the sink devices to complete its power cycle + * and then try HDCP authentication. The values of 10 and delay of 50ms + * was decided based on multiple trial and errors. */ - for (i = 0; i < 10; i++) { + for (i = 0; i < max_retries; i++) { if (!intel_hdcp2_get_capability(connector)) { msleep(50); continue; -- cgit v1.2.3