AVIVO_CRTC_DISP_READ_REQUEST_DISABLE
tmp |= AVIVO_CRTC_DISP_READ_REQUEST_DISABLE;
tmp &= ~AVIVO_CRTC_DISP_READ_REQUEST_DISABLE;
if (!(tmp & AVIVO_CRTC_DISP_READ_REQUEST_DISABLE)) {
tmp |= AVIVO_CRTC_DISP_READ_REQUEST_DISABLE;
tmp &= ~AVIVO_CRTC_DISP_READ_REQUEST_DISABLE;