drm/i915/psr: HW will not allow PR on eDP when HDCP enabled

Take into account in Panel Replay compute config that  HW will not allow PR
on eDP when HDCP enabled.

v2: add debug message to print out why Panel Replay is not possible

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

@@ -1523,6 +1523,9 @@ _panel_replay_compute_config(struct intel_dp *intel_dp,
 			     const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+	struct intel_hdcp *hdcp = &connector->hdcp;
 
 	if (!CAN_PANEL_REPLAY(intel_dp))
 		return false;
@@ -1544,6 +1547,17 @@ _panel_replay_compute_config(struct intel_dp *intel_dp,
 		return false;
 	}
 
+	/* HW will not allow Panel Replay on eDP when HDCP enabled */
+	if (conn_state->content_protection ==
+	    DRM_MODE_CONTENT_PROTECTION_DESIRED ||
+	    (conn_state->content_protection ==
+	     DRM_MODE_CONTENT_PROTECTION_ENABLED && hdcp->value ==
+	     DRM_MODE_CONTENT_PROTECTION_UNDESIRED)) {
+		drm_dbg_kms(&i915->drm,
+			    "Panel Replay is not supported with HDCP\n");
+		return false;
+	}
+
 	return true;
 }