BA1_PFIE
pfie = snd_cs46xx_peek(chip, BA1_PFIE);
snd_cs46xx_poke(chip, BA1_PFIE, pfie);
tmp = snd_cs46xx_peek(chip, BA1_PFIE);
snd_cs46xx_poke(chip, BA1_PFIE, tmp); /* playback interrupt disable */
tmp = snd_cs46xx_peek(chip, BA1_PFIE);
snd_cs46xx_poke(chip, BA1_PFIE, tmp); /* playback interrupt enable */