drm/i915/psr: Check panel Early Transport capability for eDP PR

Our HW doesn't support panel replay without Early Transport on eDP.

Bspec: 68920

Signed-off-by: Jouni Högander <[email protected]>
Reviewed-by: Animesh Manna <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: hogander

drivers/gpu/drm/i915/display/intel_psr.c

@@ -571,11 +571,18 @@ static void _panel_replay_init_dpcd(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 
-	if (intel_dp_is_edp(intel_dp) &&
-	    !intel_alpm_aux_less_wake_supported(intel_dp)) {
-		drm_dbg_kms(&i915->drm,
-			    "Panel doesn't support AUX-less ALPM, eDP Panel Replay not possible\n");
-		return;
+	if (intel_dp_is_edp(intel_dp)) {
+		if (!intel_alpm_aux_less_wake_supported(intel_dp)) {
+			drm_dbg_kms(&i915->drm,
+				    "Panel doesn't support AUX-less ALPM, eDP Panel Replay not possible\n");
+			return;
+		}
+
+		if (!(intel_dp->pr_dpcd & DP_PANEL_REPLAY_EARLY_TRANSPORT_SUPPORT)) {
+			drm_dbg_kms(&i915->drm,
+				    "Panel doesn't support early transport, eDP Panel Replay not possible\n");
+			return;
+		}
 	}
 
 	intel_dp->psr.sink_panel_replay_support = true;