disp: msm: sde: ignore HW recovery disable event

The current SDE driver logic during MDP hang cases is to send a capture
event to user-mode if recovery custom event is registered. Otherwise, it
will enforce a device panic for debugging purpose. This might have a race
condition during the display tear-down sequence as user-mode unregisters
the recovery event when the last frame is in progress. If the last frame
causes any MDP hang, it will result in a device reset. Support only the
event registration to avoid this case, since HW recovery is not expected
to be changed dynamically.

Change-Id: I8a11e1060b239ac6827f1d078e3e396cff4c1325
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/sde/sde_encoder.h

@@ -486,12 +486,11 @@ int sde_encoder_display_failure_notification(struct drm_encoder *enc,
 bool sde_encoder_recovery_events_enabled(struct drm_encoder *encoder);
 
 /**
- * sde_encoder_recovery_events_handler - handler to enable/disable the
- * sw recovery for this connector
+ * sde_encoder_enable_recovery_event - handler to enable the sw recovery
+ * for this connector
  * @drm_enc:    Pointer to drm encoder structure
  */
-void sde_encoder_recovery_events_handler(struct drm_encoder *encoder,
-		bool val);
+void sde_encoder_enable_recovery_event(struct drm_encoder *encoder);
 /**
  * sde_encoder_in_clone_mode - checks if underlying phys encoder is in clone
  *	mode or independent display mode. ref@ WB in Concurrent writeback mode.