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drm: Add drm_vblank_work_flush_all().

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In some cases we want to flush all vblank work, right before vblank_off
for example. Add a simple function to make this possible.

Check that both pending_work and running work are empty when flushing.

Co-Developed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522053341.137592-2-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2024-05-22 07:33:39 +02:00
parent f8fa26f4e0
commit 12f84e8793
2 changed files with 24 additions and 0 deletions
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22
drivers/gpu/drm/drm_vblank_work.c
View File

@ -232,6 +232,28 @@ void drm_vblank_work_flush(struct drm_vblank_work *work)
}
EXPORT_SYMBOL(drm_vblank_work_flush);
/**
* drm_vblank_work_flush_all - flush all currently pending vblank work on crtc.
* @crtc: crtc for which vblank work to flush
*
* Wait until all currently queued vblank work on @crtc
* has finished executing once.
*/
void drm_vblank_work_flush_all(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_vblank_crtc *vblank = &dev->vblank[drm_crtc_index(crtc)];
spin_lock_irq(&dev->event_lock);
wait_event_lock_irq(vblank->work_wait_queue,
list_empty(&vblank->pending_work),
dev->event_lock);
spin_unlock_irq(&dev->event_lock);
kthread_flush_worker(vblank->worker);
}
EXPORT_SYMBOL(drm_vblank_work_flush_all);
/**
* drm_vblank_work_init - initialize a vblank work item
* @work: vblank work item

2
include/drm/drm_vblank_work.h
View File

@ -17,6 +17,7 @@ struct drm_crtc;
* drm_vblank_work_init()
* drm_vblank_work_cancel_sync()
* drm_vblank_work_flush()
* drm_vblank_work_flush_all()
*/
struct drm_vblank_work {
/**
@ -67,5 +68,6 @@ void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,
void (*func)(struct kthread_work *work));
bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work);
void drm_vblank_work_flush(struct drm_vblank_work *work);
void drm_vblank_work_flush_all(struct drm_crtc *crtc);
#endif /* !_DRM_VBLANK_WORK_H_ */