disp: msm: add support for seamless dsc switch

This change adds logic to determine dsc switch based on
the connector property "CONNECTOR_PROP_DSC_MODE" and
performs seamless DSC switch if there is any change in
DSC configuration. The connector property is populated
in msm_sub_mode based on which suitable mode is selected.

Change-Id: Ifc4931f16dfb814781bc1d72b103e09103e6bfee
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>

msm/dsi/dsi_drm.h

@@ -68,6 +68,7 @@ void dsi_connector_put_modes(struct drm_connector *connector,
 /**
  * dsi_conn_get_mode_info - retrieve information on the mode selected
  * @drm_mode: Display mode set for the display
+ * @sub_mode: Additional mode info to drm display mode
  * @mode_info: Out parameter. information of the mode.
  * @display: Pointer to private display structure
  * @avail_res: Pointer with curr available resources
@@ -75,6 +76,7 @@ void dsi_connector_put_modes(struct drm_connector *connector,
  */
 int dsi_conn_get_mode_info(struct drm_connector *connector,
 		const struct drm_display_mode *drm_mode,
+		struct msm_sub_mode *sub_mode,
 		struct msm_mode_info *mode_info,
 		void *display, const struct msm_resource_caps_info *avail_res);