mmGRPH_FLIP_CONTROL
tmp = RREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset);
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, tmp);
tmp = RREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset);
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, tmp);
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, 0);
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, async ?
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, async ?
WREG32(mmGRPH_FLIP_CONTROL + amdgpu_crtc->crtc_offset, 0);