disp: msm: sde: delay frame trigger on esd failure

This change adds support for delaying kickoff in case of ESD error.
This delay is required to handle a race condition between esd
workqueue and display thread.
When ESD workqueue detects the esd and while handling the failure
notification if the new updates arrive on display thread, there
is a possibility that ESD workqueue will keep on waiting on pp_done.
This could happen if display thread keeps on incrementing the kickoff_cnt
before workqueue can check the condition. With this change the kickoff is
delayed, allowing the workqueue to get scheduled and avoiding the race
condition.

Change-Id: I8e6fff5ea5494ae801d1e60ae85b7ad19cc12961
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

msm/sde/sde_encoder.h

@@ -189,6 +189,10 @@ struct sde_encoder_ops {
  * @valid_cpu_mask:		actual voted cpu core mask
  * @mode_info:                  stores the current mode and should be used
  *				only in commit phase
+ * @delay_kickoff		boolean to delay the kickoff, used in case
+ *				of esd attack to ensure esd workqueue detects
+ *				the previous frame transfer completion before
+ *				next update is triggered.
  */
 struct sde_encoder_virt {
 	struct drm_encoder base;
@@ -256,6 +260,7 @@ struct sde_encoder_virt {
 	struct dev_pm_qos_request pm_qos_cpu_req[NR_CPUS];
 	struct cpumask valid_cpu_mask;
 	struct msm_mode_info mode_info;
+	bool delay_kickoff;
 };
 
 #define to_sde_encoder_virt(x) container_of(x, struct sde_encoder_virt, base)