ENVY24HT_MT_INT_RSTAT
mask = ~ENVY24HT_MT_INT_RSTAT;
if ((rtn = intr & ENVY24HT_MT_INT_RSTAT) != 0) {
stat = ENVY24HT_MT_INT_RSTAT | ENVY24HT_MT_INT_RMASK;
envy24ht_wrmt(sc, ENVY24HT_MT_INT_STAT, (intr & mask) | ENVY24HT_MT_INT_RSTAT, 1);