Revert "drm/i915: Implement Link Rate fallback on Link training failure"

This reverts commit 233ce881dd91fb13eb6b09deefae33168e6ead4c.

I assumed it's ok, but really should have double-checked - CI caught
tons of fail :(

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Acked-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170301171749.13053-1-daniel.vetter@ffwll.ch

drivers/gpu/drm/i915/intel_dp.c

@@ -5790,29 +5790,6 @@ out_vdd_off:
 	return false;
 }
 
-static void intel_dp_modeset_retry_work_fn(struct work_struct *work)
-{
-	struct intel_connector *intel_connector;
-	struct drm_connector *connector;
-
-	intel_connector = container_of(work, typeof(*intel_connector),
-				       modeset_retry_work);
-	connector = &intel_connector->base;
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
-		      connector->name);
-
-	/* Grab the locks before changing connector property*/
-	mutex_lock(&connector->dev->mode_config.mutex);
-	/* Set connector link status to BAD and send a Uevent to notify
-	 * userspace to do a modeset.
-	 */
-	drm_mode_connector_set_link_status_property(connector,
-						    DRM_MODE_LINK_STATUS_BAD);
-	mutex_unlock(&connector->dev->mode_config.mutex);
-	/* Send Hotplug uevent so userspace can reprobe */
-	drm_kms_helper_hotplug_event(connector->dev);
-}
-
 bool
 intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 			struct intel_connector *intel_connector)
@@ -5825,10 +5802,6 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	enum port port = intel_dig_port->port;
 	int type;
 
-	/* Initialize the work for modeset in case of link train failure */
-	INIT_WORK(&intel_connector->modeset_retry_work,
-		  intel_dp_modeset_retry_work_fn);
-
 	if (WARN(intel_dig_port->max_lanes < 1,
 		 "Not enough lanes (%d) for DP on port %c\n",
 		 intel_dig_port->max_lanes, port_name(port)))

drivers/gpu/drm/i915/intel_dp_link_training.c

@@ -313,24 +313,6 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp)
 void
 intel_dp_start_link_train(struct intel_dp *intel_dp)
 {
-	struct intel_connector *intel_connector = intel_dp->attached_connector;
-
-	if (!intel_dp_link_training_clock_recovery(intel_dp))
-		goto failure_handling;
-	if (!intel_dp_link_training_channel_equalization(intel_dp))
-		goto failure_handling;
-
-	DRM_DEBUG_KMS("Link Training Passed at Link Rate = %d, Lane count = %d",
-		      intel_dp->link_rate, intel_dp->lane_count);
-	return;
-
- failure_handling:
-	DRM_DEBUG_KMS("Link Training failed at link rate = %d, lane count = %d",
-		      intel_dp->link_rate, intel_dp->lane_count);
-	if (!intel_dp_get_link_train_fallback_values(intel_dp,
-						     intel_dp->link_rate,
-						     intel_dp->lane_count))
-		/* Schedule a Hotplug Uevent to userspace to start modeset */
-		schedule_work(&intel_connector->modeset_retry_work);
-	return;
+	intel_dp_link_training_clock_recovery(intel_dp);
+	intel_dp_link_training_channel_equalization(intel_dp);
 }

drivers/gpu/drm/i915/intel_drv.h

@@ -316,9 +316,6 @@ struct intel_connector {
 	void *port; /* store this opaque as its illegal to dereference it */
 
 	struct intel_dp *mst_port;
-
-	/* Work struct to schedule a uevent on link train failure */
-	struct work_struct modeset_retry_work;
 };
 
 struct dpll {