[PATCH] drm/radeon: Ignore RADEON_GEM_GTT_WC on 32-bit x86

[Alex Deucher]

On Thu, Nov 27, 2014 at 4:00 AM, Michel Dänzer <michel at daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84627
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

Applied to my -fixes tree.

Thanks,

Alex

> ---
>  drivers/gpu/drm/radeon/radeon_object.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index 33e6c7a..d4f472b 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -233,6 +233,13 @@ int radeon_bo_create(struct radeon_device *rdev,
>         if (!(rdev->flags & RADEON_IS_PCIE))
>                 bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
>
> +#ifdef CONFIG_X86_32
> +       /* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit
> +        * See https://bugs.freedesktop.org/show_bug.cgi?id=84627
> +        */
> +       bo->flags &= ~RADEON_GEM_GTT_WC;
> +#endif
> +
>         radeon_ttm_placement_from_domain(bo, domain);
>         /* Kernel allocation are uninterruptible */
>         down_read(&rdev->pm.mclk_lock);
> --
> 2.1.3
>
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