disp: msm: sde: use different spin lock for frame events

Due to lock sequence inconsistency between sde_crtc->spin_lock and
sde_kms->hw_intr->irq_lock can cause deadlock, to avoid this possible
deadlock this change uses different spin lock for frame events.

Change-Id: I51b1184dfa1069c87653099b95b992b277721daf
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>

msm/sde/sde_crtc.h

@@ -263,7 +263,8 @@ struct sde_crtc_misr_info {
  * @frame_pending : Whether or not an update is pending
  * @frame_events  : static allocation of in-flight frame events
  * @frame_event_list : available frame event list
- * @spin_lock     : spin lock for frame event, transaction status, etc...
+ * @spin_lock     : spin lock for transaction status, etc...
+ * @fevent_spin_lock     : spin lock for frame event
  * @event_thread  : Pointer to event handler thread
  * @event_worker  : Event worker queue
  * @event_cache   : Local cache of event worker structures
@@ -350,6 +351,7 @@ struct sde_crtc {
 	struct sde_crtc_frame_event frame_events[SDE_CRTC_FRAME_EVENT_SIZE];
 	struct list_head frame_event_list;
 	spinlock_t spin_lock;
+	spinlock_t fevent_spin_lock;
 
 	/* for handling internal event thread */
 	struct sde_crtc_event event_cache[SDE_CRTC_MAX_EVENT_COUNT];