Commit 77171ead authored Jan 16, 2020 by Christian König Committed by Alex Deucher Jan 27, 2020

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>

parent da2f84ba

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

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