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drm/i915: Check for FRL training before DP Link training

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This patch calls functions to check FRL training requirements
for an HDMI2.1 sink, when connected through PCON.
The call is made before the DP link training. In case FRL is not
required or failure during FRL training, the TMDS mode is selected
for the pcon.

v2: moved check_frl_training() just after FEC READY, before
starting DP link training.

v3: rebase

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201218103723.30844-11-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2020-12-18 16:07:18 +05:30 committed by Jani Nikula
parent ced42f2df5
commit 4f3dd47acb
2 changed files with 4 additions and 0 deletions
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2
drivers/gpu/drm/i915/display/intel_ddi.c
View File

@ -3651,6 +3651,8 @@ static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
*/
intel_dp_sink_set_fec_ready(intel_dp, crtc_state);
intel_dp_check_frl_training(intel_dp);
/*
* 7.i Follow DisplayPort specification training sequence (see notes for
* failure handling)

2
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -4252,6 +4252,7 @@ static void intel_enable_dp(struct intel_atomic_state *state,
intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
intel_dp_configure_protocol_converter(intel_dp);
intel_dp_check_frl_training(intel_dp);
intel_dp_start_link_train(intel_dp, pipe_config);
intel_dp_stop_link_train(intel_dp, pipe_config);
@ -6173,6 +6174,7 @@ int intel_dp_retrain_link(struct intel_encoder *encoder,
!intel_dp_mst_is_master_trans(crtc_state))
continue;
intel_dp_check_frl_training(intel_dp);
intel_dp_start_link_train(intel_dp, crtc_state);
intel_dp_stop_link_train(intel_dp, crtc_state);
break;