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
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b87b4ce..9ecc6bf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3363,9 +3363,19 @@ void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
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);
+ }
mutex_lock(&dev->struct_mutex);
intel_finish_fb(crtc->primary->fb);
--
1.7.9.5
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