disp: msm: Add support for seamless panel operating mode switch

DSI display may support video mode and command mode both and it may
support transition between these two modes.
This change adds seamless transition between these two modes for DSI
display by avoiding crtc enable/disable and panel power on/off
during modeset.

Change-Id: Id7ddaef7d1f0f7cc7d52283755bad53a246adec6
Signed-off-by: Lei Chen <chenlei@codeaurora.org>

msm/sde/sde_encoder.h

@@ -201,12 +201,12 @@ void sde_encoder_virt_restore(struct drm_encoder *encoder);
 bool sde_encoder_is_dsc_merge(struct drm_encoder *drm_enc);
 
 /**
- * sde_encoder_check_mode - check if given mode is supported or not
+ * sde_encoder_check_curr_mode - check if given mode is supported or not
  * @drm_enc: Pointer to drm encoder object
  * @mode: Mode to be checked
  * @Return: true if it is cmd mode
  */
-bool sde_encoder_check_mode(struct drm_encoder *drm_enc, u32 mode);
+bool sde_encoder_check_curr_mode(struct drm_encoder *drm_enc, u32 mode);
 
 /**
  * sde_encoder_init - initialize virtual encoder object