[Intel-gfx] [PATCH v3 3/3] drm/i915/display: Configure HDMI2.1 Pcon for FRL only if Src-Ctl mode is available

[Ankit Nautiyal]

Currently we see only the MAX FRL BW from PCON before going for FRL.
Also add the check if source control mode is supported by the
PCON, before starting configuring PCON for FRL training.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 2e90359ce21f..8e401d3fd29d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2638,7 +2638,8 @@ 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) ||
+	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;
 
-- 
2.29.2