drm: also move DSI panels to the front of the connector list

We've overlooked adding DSI panels to the front of the connector
list. This seems to be the right thing to do, and I suspect this might
fix some issues, although I currently have no evidence to support this.

v2: also git add the comment change

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1479378548-32695-1-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/drm_modeset_helper.c

@@ -38,7 +38,7 @@
  * Some userspace presumes that the first connected connector is the main
  * display, where it's supposed to display e.g. the login screen. For
  * laptops, this should be the main panel. Use this function to sort all
- * (eDP/LVDS) panels to the front of the connector list, instead of
+ * (eDP/LVDS/DSI) panels to the front of the connector list, instead of
  * painstakingly trying to initialize them in the right order.
  */
 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
@@ -51,7 +51,8 @@ void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
 	list_for_each_entry_safe(connector, tmp,
 				 &dev->mode_config.connector_list, head) {
 		if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
-		    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+		    connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
+		    connector->connector_type == DRM_MODE_CONNECTOR_DSI)
 			list_move_tail(&connector->head, &panel_list);
 	}