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/dp/dp_drm.c

@@ -377,6 +377,7 @@ end:
 
 int dp_connector_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)
 {

msm/dp/dp_drm.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _DP_DRM_H_
@@ -103,12 +103,14 @@ enum drm_mode_status dp_connector_mode_valid(struct drm_connector *connector,
  * @connector: Pointer to drm connector structure
  * @drm_mode: Display mode set for the display
  * @mode_info: Out parameter. Information of the mode
+ * @sub_mode: Additional mode info to drm display mode
  * @display: Pointer to private display structure
  * @avail_res: Pointer with curr available resources
  * Returns: zero on success
  */
 int dp_connector_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);
 
@@ -216,6 +218,7 @@ static inline enum drm_mode_status dp_connector_mode_valid(
 
 static inline int dp_connector_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)
 {

msm/dp/dp_mst_drm.c

@@ -1116,6 +1116,7 @@ int dp_mst_connector_get_info(struct drm_connector *connector,
 
 int dp_mst_connector_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)
@@ -1125,7 +1126,7 @@ int dp_mst_connector_get_mode_info(struct drm_connector *connector,
 	DP_MST_DEBUG("enter:\n");
 	SDE_EVT32_EXTERNAL(SDE_EVTLOG_FUNC_ENTRY, connector->base.id);
 
-	rc = dp_connector_get_mode_info(connector, drm_mode, mode_info,
+	rc = dp_connector_get_mode_info(connector, drm_mode, NULL, mode_info,
 			display, avail_res);
 
 	DP_MST_DEBUG("mst connector:%d get mode info. rc:%d\n",