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drm/i915/display: Configure HDMI2.1 Pcon for FRL only if Src-Ctl mode is available

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Add the check if source control mode is supported by the
PCON, before starting configuring PCON for FRL training,
as per spec VESA DP2.0-HDMI2.1 PCON Draft-1 Sec-7.

v2: Added spec details for the change. (Uma)

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/20210323112422.1211-3-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2021-03-23 16:54:22 +05:30 committed by Jani Nikula
parent 68a8c645b2
commit 04b6603d13
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/display/intel_dp.c
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@ -2155,8 +2155,13 @@ void intel_dp_check_frl_training(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
/* Always go for FRL training if supported */
if (!intel_dp_is_hdmi_2_1_sink(intel_dp) ||
/*
* Always go for FRL training if:
* -PCON supports SRC_CTL_MODE (VESA DP2.0-HDMI2.1 PCON Spec Draft-1 Sec-7)
* -sink is HDMI2.1
*/
if (!(intel_dp->dpcd[2] & DP_PCON_SOURCE_CTL_MODE) ||
!intel_dp_is_hdmi_2_1_sink(intel_dp) ||
intel_dp->frl.is_trained)
return;