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path: root/drivers/gpu/drm
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Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/drm_irq.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 3795dbc0f50..93e677a481f 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -435,6 +435,8 @@ EXPORT_SYMBOL(drm_vblank_get);
*/
void drm_vblank_put(struct drm_device *dev, int crtc)
{
+ BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
+
/* Last user schedules interrupt disable */
if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
@@ -460,8 +462,9 @@ void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
* so that interrupts remain enabled in the interim.
*/
if (!dev->vblank_inmodeset[crtc]) {
- dev->vblank_inmodeset[crtc] = 1;
- drm_vblank_get(dev, crtc);
+ dev->vblank_inmodeset[crtc] = 0x1;
+ if (drm_vblank_get(dev, crtc) == 0)
+ dev->vblank_inmodeset[crtc] |= 0x2;
}
}
EXPORT_SYMBOL(drm_vblank_pre_modeset);
@@ -473,9 +476,12 @@ void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
if (dev->vblank_inmodeset[crtc]) {
spin_lock_irqsave(&dev->vbl_lock, irqflags);
dev->vblank_disable_allowed = 1;
- dev->vblank_inmodeset[crtc] = 0;
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
- drm_vblank_put(dev, crtc);
+
+ if (dev->vblank_inmodeset[crtc] & 0x2)
+ drm_vblank_put(dev, crtc);
+
+ dev->vblank_inmodeset[crtc] = 0;
}
}
EXPORT_SYMBOL(drm_vblank_post_modeset);