From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: fredrik.bruhn@unibap.com, amd-gfx@lists.freedesktop.org
Subject: [PATCH] drm/amdgpu: add coreboot workaround for KV/KB
Date: Thu, 16 Jan 2020 14:09:07 +0100 [thread overview]
Message-ID: <20200116130907.22410-1-christian.koenig@amd.com> (raw)
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>
---
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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next reply other threads:[~2020-01-16 13:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 13:09 Christian König [this message]
2020-01-16 15:50 ` [PATCH] drm/amdgpu: add coreboot workaround for KV/KB Alex Deucher
2020-01-17 2:01 ` Felix Kuehling
2020-01-17 8:17 ` Christian König
2020-01-17 9:49 ` Christian König
2020-01-17 17:07 ` Felix Kuehling
2020-01-17 18:46 ` Christian König
2020-01-17 20:52 ` Felix Kuehling
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