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drm/i915: Decouple the stuck pageflip on modeset

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If we successfully confuse the hardware, and cause it to drop a queued
pageflip, we wait for 60s and issue a warning before continuing on with
the modeset. However, this leaves the pending pageflip still stuck
indefinitely. Pretend to userspace that it does complete, and let us
start afresh following the modeset.

v2: Rebase after refactor
v3: Rebase, rebase.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
References: https://bugs.freedesktop.org/show_bug.cgi?id=82612
Signed-off-by: Daniel Vetter <[email protected]>
This commit is contained in:
Chris Wilson 2014-09-05 07:13:25 +01:00 • committed by Daniel Vetter
commit 9c78794290
1 changed files with 13 additions and 3 deletions
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16
drivers/gpu/drm/i915/intel_display.c
View file

@ -3417,9 +3417,19 @@ void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
struct drm_i915_private *dev_priv = dev->dev_private;
WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));
WARN_ON(wait_event_timeout(dev_priv->pending_flip_queue,
!intel_crtc_has_pending_flip(crtc),
60*HZ) == 0);
if (WARN_ON(wait_event_timeout(dev_priv->pending_flip_queue,
!intel_crtc_has_pending_flip(crtc),
60*HZ) == 0)) {
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (intel_crtc->unpin_work) {
WARN_ONCE(1, "Removing stuck page flip\n");
page_flip_completed(intel_crtc);
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}
if (crtc->primary->fb) {
mutex_lock(&dev->struct_mutex);