drm/amdgpu: refine the logic in amdgpu_need_post()
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 28 Mar 2017 16:19:31 +0000 (12:19 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 30 Mar 2017 03:55:44 +0000 (23:55 -0400)
We check the mem config register to make sure it's been
programmed by the vbios to determine if we need to post
so we check for a non-0 value.  However, when the asic
comes out of reset, we may see all ones here, so check
for that too.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

index abb51bd77ca776c31fd3663fe92bfebd00a94bfd..ae31744dac28a8df6550abef270d98403e5a9103 100644 (file)
@@ -719,7 +719,7 @@ bool amdgpu_need_post(struct amdgpu_device *adev)
        /* then check MEM_SIZE, in case the crtcs are off */
        reg = amdgpu_asic_get_config_memsize(adev);
 
-       if (reg)
+       if ((reg != 0) && (reg != 0xffffffff))
                return false;
 
        return true;