diff options
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/drm_irq.c | 72 |
1 files changed, 40 insertions, 32 deletions
diff --git a/linux-core/drm_irq.c b/linux-core/drm_irq.c index 75e53da9..1f887d31 100644 --- a/linux-core/drm_irq.c +++ b/linux-core/drm_irq.c @@ -412,7 +412,7 @@ int drm_vblank_get(struct drm_device *dev, int crtc) unsigned long irqflags; int ret = 0; - spin_lock_irqsave(&dev->vbl_lock, irqflags); + spin_lock_irqsave(&dev->vbl_lock, irqflags); /* Going from 0->1 means we have to enable interrupts again */ if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && !dev->vblank_enabled[crtc]) { @@ -455,47 +455,49 @@ EXPORT_SYMBOL(drm_vblank_put); * * Generally the counter will reset across mode sets. If interrupts are * enabled around this call, we don't have to do anything since the counter - * will have already been incremented. If interrupts are off though, we need - * to make sure we account for the lost events at %_DRM_POST_MODESET time. + * will have already been incremented. */ int drm_modeset_ctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_modeset_ctl *modeset = data; unsigned long irqflags; - u32 new, diff; int crtc, ret = 0; + /* If drm_vblank_init() hasn't been called yet, just no-op */ + if (!dev->num_crtcs) + goto out; + crtc = modeset->crtc; if (crtc >= dev->num_crtcs) { ret = -EINVAL; goto out; } + /* + * To avoid all the problems that might happen if interrupts + * were enabled/disabled around or between these calls, we just + * have the kernel take a reference on the CRTC (just once though + * to avoid corrupting the count if multiple, mismatch calls occur), + * so that interrupts remain enabled in the interim. + */ switch (modeset->cmd) { case _DRM_PRE_MODESET: - spin_lock_irqsave(&dev->vbl_lock, irqflags); - dev->vblank_disable_allowed = 1; - if (!dev->vblank_enabled[crtc]) { - dev->vblank_premodeset[crtc] = - dev->driver->get_vblank_counter(dev, crtc); + if (!dev->vblank_suspend[crtc]) { + spin_lock_irqsave(&dev->vbl_lock, irqflags); dev->vblank_suspend[crtc] = 1; + spin_unlock_irqrestore(&dev->vbl_lock, irqflags); + drm_vblank_get(dev, crtc); } - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); break; case _DRM_POST_MODESET: - spin_lock_irqsave(&dev->vbl_lock, irqflags); - dev->vblank_disable_allowed = 1; - new = dev->driver->get_vblank_counter(dev, crtc); - if (dev->vblank_suspend[crtc] && !dev->vblank_enabled[crtc]) { - if (new > dev->vblank_premodeset[crtc]) - diff = dev->vblank_premodeset[crtc] - new; - else - diff = new; - atomic_add(diff, &dev->_vblank_count[crtc]); + if (dev->vblank_suspend[crtc]) { + spin_lock_irqsave(&dev->vbl_lock, irqflags); + dev->vblank_disable_allowed = 1; + dev->vblank_suspend[crtc] = 0; + spin_unlock_irqrestore(&dev->vbl_lock, irqflags); + drm_vblank_put(dev, crtc); } - dev->vblank_suspend[crtc] = 0; - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); break; default: ret = -EINVAL; @@ -549,6 +551,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data, if (crtc >= dev->num_crtcs) return -EINVAL; + ret = drm_vblank_get(dev, crtc); + if (ret) + return ret; seq = drm_vblank_count(dev, crtc); switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { @@ -558,7 +563,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data, case _DRM_VBLANK_ABSOLUTE: break; default: - return -EINVAL; + ret = -EINVAL; + goto done; } if ((flags & _DRM_VBLANK_NEXTONMISS) && @@ -571,8 +577,10 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct list_head *vbl_sigs = &dev->vbl_sigs[crtc]; struct drm_vbl_sig *vbl_sig; - if (dev->vblank_suspend[crtc]) - return -EBUSY; + if (dev->vblank_suspend[crtc]) { + ret = -EBUSY; + goto done; + } spin_lock_irqsave(&dev->vbl_lock, irqflags); @@ -594,15 +602,18 @@ int drm_wait_vblank(struct drm_device *dev, void *data, if (atomic_read(&dev->vbl_signal_pending) >= 100) { spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - return -EBUSY; + ret = -EBUSY; + goto done; } spin_unlock_irqrestore(&dev->vbl_lock, irqflags); vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER); - if (!vbl_sig) - return -ENOMEM; + if (!vbl_sig) { + ret = -ENOMEM; + goto done; + } ret = drm_vblank_get(dev, crtc); if (ret) { @@ -626,13 +637,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data, vblwait->reply.sequence = seq; } else { if (!dev->vblank_suspend[crtc]) { - ret = drm_vblank_get(dev, crtc); - if (ret) - return ret; DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, ((drm_vblank_count(dev, crtc) - vblwait->request.sequence) <= (1 << 23))); - drm_vblank_put(dev, crtc); } if (ret != -EINTR) { @@ -646,7 +653,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data, } } - done: +done: + drm_vblank_put(dev, crtc); return ret; } |