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drm: Kick start vblank interrupts at drm_vblank_on()

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If the user is interested in getting accurate vblank sequence
numbers all the time they may disable the vblank disable timer
entirely. In that case it seems appropriate to kick start the
vblank interrupts already from drm_vblank_on().

v2: Adapt to the drm_vblank_offdelay ==0 vs <0 changes

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-08-06 14:49:56 +03:00 committed by Daniel Vetter
parent 21da27005f
commit cd19e52aee
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/drm_irq.c
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@ -1126,9 +1126,12 @@ void drm_vblank_on(struct drm_device *dev, int crtc)
vblank->last =
(dev->driver->get_vblank_counter(dev, crtc) - 1) &
dev->max_vblank_count;
/* re-enable interrupts if there's are users left */
if (atomic_read(&vblank->refcount) != 0)
/*
* re-enable interrupts if there are users left, or the
* user wishes vblank interrupts to be enabled all the time.
*/
if (atomic_read(&vblank->refcount) != 0 ||
(!dev->vblank_disable_immediate && drm_vblank_offdelay == 0))
WARN_ON(drm_vblank_enable(dev, crtc));
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
}