amdgpu_device_get_rev_id
u32 amdgpu_device_get_rev_id(struct amdgpu_device *adev);
!amdgpu_device_get_rev_id(adev)) {
adev->rev_id = amdgpu_device_get_rev_id(adev);
adev->rev_id = amdgpu_device_get_rev_id(adev);
adev->rev_id = amdgpu_device_get_rev_id(adev);
adev->rev_id = amdgpu_device_get_rev_id(adev);