From: Christian König Date: Mon, 7 Nov 2016 09:19:40 +0000 (+0100) Subject: drm/amdgpu: access stolen VRAM directly on CZ (v2) X-Git-Tag: v4.14-rc1~1422^2~31^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=999446a786727af6bb5affccf2893b7c3976b675;p=platform%2Fkernel%2Flinux-rpi3.git drm/amdgpu: access stolen VRAM directly on CZ (v2) We don't need to use the PCI BAR on APUs. This allows us to access the full VRAM directly without being limited by the BAR size. v2: squash in 64bit shift fix Signed-off-by: Christian König Reviewed-by: Michel Dänzer Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c index 684a5f3..7669b32 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c @@ -467,9 +467,16 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev) /* size in MB on si */ adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL; adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL; - adev->mc.visible_vram_size = adev->mc.aper_size; + +#ifdef CONFIG_X86_64 + if (adev->flags & AMD_IS_APU) { + adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22; + adev->mc.aper_size = adev->mc.real_vram_size; + } +#endif /* In case the PCI BAR is larger than the actual amount of vram */ + adev->mc.visible_vram_size = adev->mc.aper_size; if (adev->mc.visible_vram_size > adev->mc.real_vram_size) adev->mc.visible_vram_size = adev->mc.real_vram_size;