Re: [PATCH] drm/amdgpu: fix AGP location with VRAM at 0x0

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On 10/04/2018 05:02 PM, Christian König wrote:
That also simplifies handling quite a bit.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Junwei Zhang <Jerry.Zhang@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 7 ++-----
  1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 9a5b252784a1..999e15945355 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -200,16 +200,13 @@ void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
  	}
if (size_bf > size_af) {
-		mc->agp_start = mc->fb_start > mc->gart_start ?
-			mc->gart_end + 1 : 0;
+		mc->agp_start = (mc->fb_start - size_bf) & sixteen_gb_mask;
  		mc->agp_size = size_bf;
  	} else {
-		mc->agp_start = (mc->fb_start > mc->gart_start ?
-			mc->fb_end : mc->gart_end) + 1,
+		mc->agp_start = ALIGN(mc->fb_end + 1, sixteen_gb);
  		mc->agp_size = size_af;
  	}
- mc->agp_start = ALIGN(mc->agp_start, sixteen_gb);
  	mc->agp_end = mc->agp_start + mc->agp_size - 1;
  	dev_info(adev->dev, "AGP: %lluM 0x%016llX - 0x%016llX\n",
  			mc->agp_size >> 20, mc->agp_start, mc->agp_end);

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