On Thu, Jan 16, 2020 at 8:09 AM Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> 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@xxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> 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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