diff options
| author | Christian König <christian.koenig@amd.com> | 2020-01-16 14:06:59 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-01-27 22:46:45 +0100 |
| commit | 77171eade8faa713c1104b29ea7ff96915ecf9fb (patch) | |
| tree | 20d9fe6b15869cc0840f22c071e1075d4e3ee936 /drivers/gpu | |
| parent | Revert "drm/amd/display: Don't skip link training for empty dongle" (diff) | |
| download | linux-77171eade8faa713c1104b29ea7ff96915ecf9fb.tar.xz linux-77171eade8faa713c1104b29ea7ff96915ecf9fb.zip | |
drm/amdgpu: add coreboot workaround for KV/KB
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@amd.com>
Reported-and-tested-by: Fredrik Bruhn <fredrik.bruhn@unibap.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 3 |
1 files changed, 2 insertions, 1 deletions
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; } |