ITS_IDR1_DT_LEVELS
if ((idr & ITS_IDR1_DT_LEVELS) != 0)
if ((idr & (ITS_IDR1_ITT_LEVELS | ITS_IDR1_DT_LEVELS)) != 0) {
two_levels = (idr & ITS_IDR1_DT_LEVELS) != 0;