On Fri, May 30, 2014 at 05:16:35PM +0100, Chris Wilson wrote:
> 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.
>
> 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 | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 764b277e5937..54b69838e2de 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3329,9 +3329,21 @@ 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");
> + drm_vblank_put(dev, intel_crtc->pipe);
> + page_flip_completed(dev_priv, intel_crtc, intel_crtc->unpin_work);
> + intel_crtc->unpin_work = NULL;
> + }
> + spin_unlock_irqrestore(&dev->event_lock, flags);
> + }
Seems like a decent idea.
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Though my comment (to the other patch) about moving drm_vblank_put()
into page_flip_completed() still seems valid.
>
> mutex_lock(&dev->struct_mutex);
> intel_finish_fb(crtc->primary->fb);
> --
> 2.0.0.rc4
--
Ville Syrjälä
Intel OTC
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