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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-01-14 13:18:02 -0800
committerEric Anholt <eric@anholt.net>2010-01-25 22:01:12 -0800
commitde3f440f8c9922afe8770dd16c84f1c87d779b59 (patch)
tree3f5eafaeb3e90a92b3ca503592d99277fe60816b /drivers/gpu/drm/i915/intel_display.c
parent8a6c77d645d9111f7bc01f908464301f5c3e0a05 (diff)
drm/i915: handle non-flip pending case when unpinning the scanout buffer
The first page flip queued will replace the current front buffer, which should have a 0 pending flip count. So at finish time we need to handle that case (i.e. if the flip count is 0 *or* dec_and_test is 0 we need to wake the waiters). Also fix up an error path in the queue function and add some debug output (only enabled with driver debugging). Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
-rw-r--r--drivers/gpu/drm/i915/intel_display.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2cc489b6629..5f14dfbf715 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3985,6 +3985,12 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
spin_lock_irqsave(&dev->event_lock, flags);
work = intel_crtc->unpin_work;
if (work == NULL || !work->pending) {
+ if (work && !work->pending) {
+ obj_priv = work->obj->driver_private;
+ DRM_DEBUG_DRIVER("flip finish: %p (%d) not pending?\n",
+ obj_priv,
+ atomic_read(&obj_priv->pending_flip));
+ }
spin_unlock_irqrestore(&dev->event_lock, flags);
return;
}
@@ -4006,7 +4012,10 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
spin_unlock_irqrestore(&dev->event_lock, flags);
obj_priv = work->obj->driver_private;
- if (atomic_dec_and_test(&obj_priv->pending_flip))
+
+ /* Initial scanout buffer will have a 0 pending flip count */
+ if ((atomic_read(&obj_priv->pending_flip) == 0) ||
+ atomic_dec_and_test(&obj_priv->pending_flip))
DRM_WAKEUP(&dev_priv->pending_flip_queue);
schedule_work(&work->work);
}
@@ -4019,8 +4028,11 @@ void intel_prepare_page_flip(struct drm_device *dev, int plane)
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
- if (intel_crtc->unpin_work)
+ if (intel_crtc->unpin_work) {
intel_crtc->unpin_work->pending = 1;
+ } else {
+ DRM_DEBUG_DRIVER("preparing flip with no unpin work?\n");
+ }
spin_unlock_irqrestore(&dev->event_lock, flags);
}
@@ -4054,6 +4066,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
/* We borrow the event spin lock for protecting unpin_work */
spin_lock_irqsave(&dev->event_lock, flags);
if (intel_crtc->unpin_work) {
+ DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
spin_unlock_irqrestore(&dev->event_lock, flags);
kfree(work);
mutex_unlock(&dev->struct_mutex);
@@ -4067,7 +4080,10 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
ret = intel_pin_and_fence_fb_obj(dev, obj);
if (ret != 0) {
+ DRM_DEBUG_DRIVER("flip queue: %p pin & fence failed\n",
+ obj->driver_private);
kfree(work);
+ intel_crtc->unpin_work = NULL;
mutex_unlock(&dev->struct_mutex);
return ret;
}