HDAUDIO_SD_CTL0
ctl0 = hda_read1(sc, HDAUDIO_SD_CTL0(snum));
hda_write1(sc, HDAUDIO_SD_CTL0(snum), ctl0);
ctl0 = hda_read1(sc, HDAUDIO_SD_CTL0(snum));
hda_write1(sc, HDAUDIO_SD_CTL0(snum), ctl0);
ctl0 = hda_read1(sc, HDAUDIO_SD_CTL0(snum));
ctl0 = hda_read1(sc, HDAUDIO_SD_CTL0(snum));
hda_write1(sc, HDAUDIO_SD_CTL0(snum), ctl0);
ctl0 = hda_read1(sc, HDAUDIO_SD_CTL0(snum));
hda_write1(sc, HDAUDIO_SD_CTL0(snum), ctl0);