mmGRPH_ENABLE
WREG32(mmGRPH_ENABLE + amdgpu_crtc->crtc_offset, 1);
WREG32(mmGRPH_ENABLE + amdgpu_crtc->crtc_offset, 0);
WREG32(mmGRPH_ENABLE + amdgpu_crtc->crtc_offset, enable ? 1 : 0);
WREG32(mmGRPH_ENABLE + amdgpu_crtc->crtc_offset, 1);
WREG32(mmGRPH_ENABLE + amdgpu_crtc->crtc_offset, 0);