Re: [PATCH] drm/i915: Disable RCS flips on Ivybridge

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On Thu, Aug 21, 2014 at 10:10 AM, Vasily Khoruzhick <anarsoul@xxxxxxxxx> wrote:
> From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>
> This is 2a92d5bca1999b69c78f3c3e97b5484985b094b9 from 3.17-rc1
> for applying against 3.16
>
> We currently see random GPU hangs when using RCS flips with multiple
> pipes on Ivybridge. Now that we have mmio flips, we can fairly cheaply
> fallback to using CPU driven flips instead.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77104
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 8043e4b..8728c88 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -9658,6 +9658,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>
>         if (IS_VALLEYVIEW(dev)) {
>                 ring = &dev_priv->ring[BCS];
> +       } else if (IS_IVYBRIDGE(dev)) {
> +               ring = &dev_priv->ring[BCS];
>         } else if (INTEL_INFO(dev)->gen >= 7) {
>                 ring = obj->ring;
>                 if (ring == NULL || ring->id != RCS)
> --
> 2.1.0
>
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