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/sde/sde_connector.h

@@ -138,6 +138,7 @@ struct sde_connector_ops {
 	 * get_mode_info - retrieve mode information
 	 * @connector: Pointer to drm connector structure
 	 * @drm_mode: Display mode set for the display
+	 * @sub_mode: Additional mode info to drm display mode
 	 * @mode_info: Out parameter. information of the display mode
 	 * @display: Pointer to private display structure
 	 * @avail_res: Pointer with curr available resources
@@ -145,6 +146,7 @@ struct sde_connector_ops {
 	 */
 	int (*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);
@@ -1080,11 +1082,13 @@ int sde_connector_set_msm_mode(struct drm_connector_state *conn_state,
 * sde_connector_get_mode_info - retrieve mode info for given mode
 * @connector: Pointer to drm connector structure
 * @drm_mode: Display mode set for the display
+* @sub_mode: Additional mode info to drm display mode
 * @mode_info: Out parameter. information of the display mode
 * Returns: Zero on success
 */
 int sde_connector_get_mode_info(struct drm_connector *conn,
 		const struct drm_display_mode *drm_mode,
+		struct msm_sub_mode *sub_mode,
 		struct msm_mode_info *mode_info);
 
 /**