samsung-sm8650/android_kernel_samsung_sm8650-modules
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

disp: msm: sde: manage vblank refcount concurrency

Browse Source 
Vblank refcount can reach out of sync with below case
 1. event_thread triggers the vblank_enable
 2. commit_thread triggers the modeset
   2.a modeset resets the vblank refcount with mode_set
 3. event_thread triggers the vblank_disable

Event 2.a resets the vblank refcount and vblank disable
request after 2.a is going to fail. This can be fixed
by avoiding concurrency between mode_set call and vblank
request.

Change-Id: Ibb810ec90e81d63feee443f1c37dd736d5cfac0d
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
This commit is contained in:
Dhaval Patel
2020-06-12 15:39:33 -07:00
committed by Gerrit - the friendly Code Review server
parent 743dc695c4
commit 44cde01fc7
5 changed files with 37 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
msm/sde/sde_encoder_phys.h
View File

@@ -275,6 +275,7 @@ struct sde_encoder_irq {
* @enc_spinlock: Virtual-Encoder-Wide Spin Lock for IRQ purposes
* @enable_state: Enable state tracking
* @vblank_refcount: Reference count of vblank request
* @vblank_cached_refcount: Reference count of vblank cached request
* @wbirq_refcount: Reference count of wb irq request
* @vsync_cnt: Vsync count for the physical encoder
* @underrun_cnt: Underrun count for the physical encoder
@@ -324,6 +325,7 @@ struct sde_encoder_phys {
enum sde_enc_enable_state enable_state;
struct mutex *vblank_ctl_lock;
atomic_t vblank_refcount;
atomic_t vblank_cached_refcount;
atomic_t wbirq_refcount;
atomic_t vsync_cnt;
atomic_t underrun_cnt;