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-rw-r--r--linux-core/drmP.h5
-rw-r--r--linux-core/drm_irq.c22
2 files changed, 15 insertions, 12 deletions
diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 69d31e14..d7b1960c 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -840,13 +840,12 @@ struct drm_device {
atomic_t *vblank_refcount; /* number of users of vblank interrupts per crtc */
u32 *last_vblank; /* protected by dev->vbl_lock, used */
/* for wraparound handling */
- u32 *vblank_offset; /* used to track how many vblanks */
int *vblank_enabled; /* so we don't call enable more than
once per disable */
- u32 *vblank_premodeset; /* were lost during modeset */
+ u32 *vblank_premodeset; /* for compensation of spurious wraparounds */
struct timer_list vblank_disable_timer;
- unsigned long max_vblank_count; /**< size of vblank counter register */
+ u32 max_vblank_count; /**< size of vblank counter register */
spinlock_t tasklet_lock; /**< For drm_locked_tasklet */
void (*locked_tasklet_func)(struct drm_device *dev);
diff --git a/linux-core/drm_irq.c b/linux-core/drm_irq.c
index ccb3ca89..3627a890 100644
--- a/linux-core/drm_irq.c
+++ b/linux-core/drm_irq.c
@@ -112,8 +112,6 @@ static void drm_vblank_cleanup(struct drm_device *dev)
DRM_MEM_DRIVER);
drm_free(dev->vblank_premodeset, sizeof(*dev->vblank_premodeset) *
dev->num_crtcs, DRM_MEM_DRIVER);
- drm_free(dev->vblank_offset, sizeof(*dev->vblank_offset) * dev->num_crtcs,
- DRM_MEM_DRIVER);
dev->num_crtcs = 0;
}
@@ -162,10 +160,6 @@ int drm_vblank_init(struct drm_device *dev, int num_crtcs)
if (!dev->vblank_premodeset)
goto err;
- dev->vblank_offset = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
- if (!dev->vblank_offset)
- goto err;
-
/* Zero per-crtc vblank stuff */
for (i = 0; i < num_crtcs; i++) {
init_waitqueue_head(&dev->vbl_queue[i]);
@@ -330,8 +324,7 @@ int drm_control(struct drm_device *dev, void *data,
*/
u32 drm_vblank_count(struct drm_device *dev, int crtc)
{
- return atomic_read(&dev->_vblank_count[crtc]) +
- dev->vblank_offset[crtc];
+ return atomic_read(&dev->_vblank_count[crtc]);
}
EXPORT_SYMBOL(drm_vblank_count);
@@ -457,7 +450,18 @@ int drm_modeset_ctl(struct drm_device *dev, void *data,
break;
case _DRM_POST_MODESET:
new = dev->driver->get_vblank_counter(dev, crtc);
- dev->vblank_offset[crtc] = dev->vblank_premodeset[crtc] - new;
+
+ /* Compensate for spurious wraparound */
+ if (new < dev->vblank_premodeset[crtc]) {
+ atomic_sub(dev->max_vblank_count + new -
+ dev->vblank_premodeset[crtc],
+ &dev->_vblank_count[crtc]);
+ DRM_DEBUG("vblank_premodeset[%d]=0x%x, new=0x%x "
+ "=> _vblank_count[%d]-=0x%x\n", crtc,
+ dev->vblank_premodeset[crtc], new,
+ crtc, dev->max_vblank_count + new -
+ dev->vblank_premodeset[crtc]);
+ }
break;
default:
ret = -EINVAL;