disp: msm: sde: add management of demura shared memory region

In cont-splash use cases the bootloader's Demura configuration
must stay operational until user space takes over display control.
Introduce Demura shared memory region handling to ensure
Demura configuration data stays consistent and accessible to the
hardware.

Change-Id: I5ef20ad9286574904b3d33a4179629d5a16746cf
Signed-off-by: Christopher Braga <cbraga@codeaurora.org>

msm/sde/sde_hw_mdss.h

@@ -641,7 +641,8 @@ struct sde_sspp_index_info {
  * used in continuous splash on a specific display.
  * @cont_splash_enabled:  Stores the cont_splash status (enabled/disabled)
  * @encoder:	Pointer to the drm encoder object used for this display
- * @splash:     Pointer to struct sde_splash_mem used for this display
+ * @splash:	Pointer to struct sde_splash_mem used for this display
+ * @demura:	Pointer to struct sde_splash_mem used for demura cont splash
  * @ctl_ids:	Stores the valid MDSS ctl block ids for the current mode
  * @lm_ids:	Stores the valid MDSS layer mixer block ids for the current mode
  * @dsc_ids:	Stores the valid MDSS DSC block ids for the current mode
@@ -657,6 +658,7 @@ struct sde_splash_display {
 	bool cont_splash_enabled;
 	struct drm_encoder *encoder;
 	struct sde_splash_mem *splash;
+	struct sde_splash_mem *demura;
 	u8 ctl_ids[MAX_DATA_PATH_PER_DSIPLAY];
 	u8 lm_ids[MAX_DATA_PATH_PER_DSIPLAY];
 	u8 dsc_ids[MAX_DATA_PATH_PER_DSIPLAY];
@@ -681,6 +683,7 @@ enum sde_handoff_type {
  * @num_splash_regions:  Indicates number of splash memory regions from dtsi
  * @num_splash_displays: Indicates count of active displays in continuous splash
  * @splash_mem:          Array of all struct sde_splash_mem listed from dtsi
+ * @demura_mem:          Array of all demura memory regions listed from dtsi
  * @splash_display:      Array of all struct sde_splash_display
  */
 struct sde_splash_data {
@@ -688,6 +691,7 @@ struct sde_splash_data {
 	u32 num_splash_regions;
 	u32 num_splash_displays;
 	struct sde_splash_mem splash_mem[MAX_DSI_DISPLAYS];
+	struct sde_splash_mem demura_mem[MAX_DSI_DISPLAYS];
 	struct sde_splash_display splash_display[MAX_DSI_DISPLAYS];
 };