From: Ville Syrjälä ville.syrjala@linux.intel.com
If the vblank irq has already been disabled (via the disable timer) when we call drm_vblank_off() sample the counter and timestamp one last time. This will make the sure that the user space visible counter will account for time between vblank irq disable and drm_vblank_off().
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_irq.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index e12cf69..bb64f0f 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -140,6 +140,19 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc) */ spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
+ /* + * If the vblank interrupt was already disbled update the count + * and timestamp to maintain the appearance that the counter + * has been ticking all along until this time. This makes the + * count account for the entire time between drm_vblank_on() and + * drm_vblank_off(). + */ + if (!dev->vblank[crtc].enabled) { + drm_update_vblank_count(dev, crtc); + spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); + return; + } + dev->driver->disable_vblank(dev, crtc); dev->vblank[crtc].enabled = false;