[Bug 75502] [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #27 from Simon Farnsworth <simon at farnz.org.uk> ---
(In reply to comment #26)
> They confirm that the dspsurf is still at 0x00372000. The earlier theories
> that another write happened are debunked. So it has to be something in the
> simple MI_DISPLAY_FLIP command packets that causes the CS to simply ignore
> it.
> 
> Try,
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 0326ea8..1a680bf 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8842,6 +8842,10 @@ static int intel_gen6_queue_flip(struct drm_device
> *dev,
>         if (ret)
>                 goto err;
>  
> +       ret = intel_ring_cacheline_align(ring);
> +       if (ret)
> +               goto err_unpin;
> +
>         ret = intel_ring_begin(ring, 4);
>         if (ret)
>                 goto err_unpin;
> 
> (current drm-intel-nightly already has that for ivb)

Tested, and still fails.

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