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drm/amdgpu: fix aper_base for APU

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[Why]
Wrong fb offset results in dmub f/w errors and white screen.
[drm:dc_dmub_srv_wait_idle [amdgpu]] *ERROR* Error waiting for DMUB idle: status=3

[How]
Read aper_base from mmhub because GC is off by default

v2: use BAR for passthrough (Alex)

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Roman Li 2022-05-25 17:20:21 -04:00 committed by Alex Deucher
parent 97e5030554
commit ae969b62e7
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
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@ -638,6 +638,12 @@ static int gmc_v11_0_mc_init(struct amdgpu_device *adev)
adev->gmc.aper_base = pci_resource_start(adev->pdev, 0);
adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
#ifdef CONFIG_X86_64
if ((adev->flags & AMD_IS_APU) && !amdgpu_passthrough(adev)) {
adev->gmc.aper_base = adev->mmhub.funcs->get_mc_fb_offset(adev);
adev->gmc.aper_size = adev->gmc.real_vram_size;
}
#endif
/* In case the PCI BAR is larger than the actual amount of vram */
adev->gmc.visible_vram_size = adev->gmc.aper_size;
if (adev->gmc.visible_vram_size > adev->gmc.real_vram_size)