[PATCH v3 12/20] drm/i915/psr: Check panel Early Transport capability for eDP PR

["Jouni Högander" <jouni.hogander@intel.com>]

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

Bspec: 68920

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 16e06312a8be..a96e03cd68ea 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -550,12 +550,19 @@ static void _panel_replay_init_dpcd(struct intel_dp *intel_dp, u8 alpm_caps)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 
-	if (intel_dp_is_edp(intel_dp) &&
-	    (!(alpm_caps & DP_ALPM_CAP) ||
-	     !(alpm_caps & DP_ALPM_AUX_LESS_CAP))) {
-		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 (!(alpm_caps & DP_ALPM_CAP) ||
+		    !(alpm_caps & DP_ALPM_AUX_LESS_CAP)) {
+			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;
-- 
2.34.1