[PATCH] drm/amdgpu: add coreboot workaround for KV/KB

[Alex Deucher]

On Thu, Jan 16, 2020 at 8:09 AM Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> Coreboot seems to have a problem correctly setting up access to the stolen VRAM
> on KV/KB. Use the direct access only when necessary.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> index 19d5b133e1d7..9da9596a3638 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> @@ -381,7 +381,8 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
>         adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
>
>  #ifdef CONFIG_X86_64
> -       if (adev->flags & AMD_IS_APU) {
> +       if (adev->flags & AMD_IS_APU &&
> +           adev->gmc.real_vram_size > adev->gmc.aper_size) {
>                 adev->gmc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22;
>                 adev->gmc.aper_size = adev->gmc.real_vram_size;
>         }
> --
> 2.17.1
>
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