From: Ankit Nautiyal Date: Tue, 23 Mar 2021 11:24:22 +0000 (+0530) Subject: drm/i915/display: Configure HDMI2.1 Pcon for FRL only if Src-Ctl mode is available X-Git-Tag: accepted/tizen/unified/20230118.172025~6402^2~29^2~250 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=04b6603d13be541df73634a18218f34a37820285;p=platform%2Fkernel%2Flinux-rpi.git drm/i915/display: Configure HDMI2.1 Pcon for FRL only if Src-Ctl mode is available 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 Reviewed-by: Uma Shankar Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20210323112422.1211-3-ankit.k.nautiyal@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index be82377..a560468 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;