mmBIF_DOORBELL_APER_EN  886 drivers/gpu/drm/amd/amdgpu/vi.c 	tmp = RREG32(mmBIF_DOORBELL_APER_EN);
mmBIF_DOORBELL_APER_EN  892 drivers/gpu/drm/amd/amdgpu/vi.c 	WREG32(mmBIF_DOORBELL_APER_EN, tmp);