mmLB_DATA_FORMAT
tmp = RREG32(mmLB_DATA_FORMAT + amdgpu_crtc->crtc_offset);
WREG32(mmLB_DATA_FORMAT + amdgpu_crtc->crtc_offset, tmp);
WREG32(mmLB_DATA_FORMAT + amdgpu_crtc->crtc_offset,
WREG32(mmLB_DATA_FORMAT + amdgpu_crtc->crtc_offset, 0);