mmCUR_UPDATE
cur_lock = RREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset);
WREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset, cur_lock);
cur_lock = RREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset);
WREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset, cur_lock);
cur_lock = RREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset);
WREG32(mmCUR_UPDATE + amdgpu_crtc->crtc_offset, cur_lock);