1 files changed, 44 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 3d3efcf02011..d638054c74ac 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -1379,10 +1379,6 @@ intel_dp_128b132b_lane_cds(struct intel_dp *intel_dp,
 		}
 	}
 
-	/* FIXME: Should DP_TRAINING_PATTERN_DISABLE be written first? */
-	if (intel_dp->set_idle_link_train)
-		intel_dp->set_idle_link_train(intel_dp, crtc_state);
-
 	return true;
 }
 
@@ -1433,7 +1429,11 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp,
 void intel_dp_start_link_train(struct intel_dp *intel_dp,
 			       const struct intel_crtc_state *crtc_state)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct intel_connector *connector = intel_dp->attached_connector;
+	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
 	bool passed;
+
 	/*
 	 * TODO: Reiniting LTTPRs here won't be needed once proper connector
 	 * HW state readout is added.
@@ -1451,6 +1451,46 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
 	else
 		passed = intel_dp_link_train_all_phys(intel_dp, crtc_state, lttpr_count);
 
+	/*
+	 * Ignore the link failure in CI
+	 *
+	 * In fixed enviroments like CI, sometimes unexpected long HPDs are
+	 * generated by the displays. If ignore_long_hpd flag is set, such long
+	 * HPDs are ignored. And probably as a consequence of these ignored
+	 * long HPDs, subsequent link trainings are failed resulting into CI
+	 * execution failures.
+	 *
+	 * For test cases which rely on the link training or processing of HPDs
+	 * ignore_long_hpd flag can unset from the testcase.
+	 */
+	if (!passed && i915->display.hotplug.ignore_long_hpd) {
+		drm_dbg_kms(&i915->drm,
+			    "[CONNECTOR:%d:%s][ENCODER:%d:%s] Ignore the link failure\n",
+			    connector->base.base.id, connector->base.name,
+			    encoder->base.base.id, encoder->base.name);
+		return;
+	}
+
 	if (!passed)
 		intel_dp_schedule_fallback_link_training(intel_dp, crtc_state);
 }
+
+void intel_dp_128b132b_sdp_crc16(struct intel_dp *intel_dp,
+				 const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+
+	/*
+	 * VIDEO_DIP_CTL register bit 31 should be set to '0' to not
+	 * disable SDP CRC. This is applicable for Display version 13.
+	 * Default value of bit 31 is '0' hence discarding the write
+	 * TODO: Corrective actions on SDP corruption yet to be defined
+	 */
+	if (intel_dp_is_uhbr(crtc_state))
+		/* DP v2.0 SCR on SDP CRC16 for 128b/132b Link Layer */
+		drm_dp_dpcd_writeb(&intel_dp->aux,
+				   DP_SDP_ERROR_DETECTION_CONFIGURATION,
+				   DP_SDP_CRC16_128B132B_EN);
+
+	drm_dbg_kms(&i915->drm, "DP2.0 SDP CRC16 for 128b/132b enabled\n");
+}