[PATCH v4 11/19] 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 | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 081109bed0e6..1e503612bd25 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -551,11 +551,18 @@ 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;
-- 
2.34.1