diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index be82377a5057..a560468765c0 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -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; |