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/msm_drv.h

@@ -226,6 +226,7 @@ enum msm_mdp_conn_property {
 	CONNECTOR_PROP_CMD_FRAME_TRIGGER_MODE,
 	CONNECTOR_PROP_SET_PANEL_MODE,
 	CONNECTOR_PROP_AVR_STEP,
+	CONNECTOR_PROP_DSC_MODE,
 
 	/* total # of properties */
 	CONNECTOR_PROP_COUNT
@@ -307,6 +308,18 @@ enum panel_op_mode {
 	MSM_DISPLAY_MODE_MAX = BIT(2)
 };
 
+/**
+ * enum msm_display_dsc_mode - panel dsc mode
+ * @MSM_DISPLAY_DSC_MODE_NONE: No operation
+ * @MSM_DISPLAY_DSC_MODE_ENABLED: DSC is enabled
+ * @MSM_DISPLAY_DSC_MODE_DISABLED: DSC is disabled
+ */
+enum msm_display_dsc_mode {
+	MSM_DISPLAY_DSC_MODE_NONE,
+	MSM_DISPLAY_DSC_MODE_ENABLED,
+	MSM_DISPLAY_DSC_MODE_DISABLED,
+};
+
 /**
  * struct msm_display_mode - wrapper for drm_display_mode
  * @base: drm_display_mode attached to this msm_mode
@@ -319,6 +332,14 @@ struct msm_display_mode {
 	u32 *private;
 };
 
+/**
+ * struct msm_sub_mode - msm display sub mode
+ * @dsc_enabled: boolean used to indicate if dsc should be enabled
+ */
+struct msm_sub_mode {
+	enum msm_display_dsc_mode dsc_mode;
+};
+
 /**
  * struct msm_ratio - integer ratio
  * @numer: numerator