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drm/amdgpu: align GTT start to 4GB v2

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For VCE to work properly the start of the GTT space must be aligned to a
4GB boundary.

v2: add comment why we do this

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-11-16 20:12:51 +01:00 committed by Alex Deucher
parent 3d647c8f93
commit b98f1b9e5e
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -622,7 +622,10 @@ void amdgpu_gart_location(struct amdgpu_device *adev, struct amdgpu_mc *mc)
dev_warn(adev->dev, "limiting GTT\n");
mc->gart_size = size_af;
}
mc->gart_start = mc->vram_end + 1;
/* VCE doesn't like it when BOs cross a 4GB segment, so align
* the GART base on a 4GB boundary as well.
*/
mc->gart_start = ALIGN(mc->vram_end + 1, 0x100000000ULL);
}
mc->gart_end = mc->gart_start + mc->gart_size - 1;
dev_info(adev->dev, "GTT: %lluM 0x%016llX - 0x%016llX\n",