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