drm: Add dev->vblank_disable_immediate flag

Add a flag to drm_device which will cause the vblank code to bypass the
disable timer and always disable the vblank interrupt immediately when
the last reference is dropped.

v2: Add some notes about the flag to the kernel doc

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 99145c4d536b..8dbcc3f892d5 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -994,7 +994,7 @@ void drm_vblank_put(struct drm_device *dev, int crtc)
 
         /* Last user schedules interrupt disable */
         if (atomic_dec_and_test(&vblank->refcount)) {
-                if (drm_vblank_offdelay < 0)
+                if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0)
                         vblank_disable_fn((unsigned long)vblank);
                 else if (drm_vblank_offdelay > 0)
                         mod_timer(&vblank->disable_timer,