Commit 12f84e87 authored by Maarten Lankhorst's avatar Maarten Lankhorst
Browse files

drm: Add drm_vblank_work_flush_all(). 



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: default avatarChaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522053341.137592-2-maarten.lankhorst@linux.intel.com
parent f8fa26f4

drivers/gpu/drm/drm_vblank_work.c

+22 −0
Original line number Diff line number Diff line
@@ -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

include/drm/drm_vblank_work.h

+2 −0
Original line number Diff line number Diff line
@@ -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_ */