diff options
| -rw-r--r-- | linux-core/drmP.h | 5 | ||||
| -rw-r--r-- | linux-core/drm_irq.c | 22 |
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; |