AR_QUIET2
OS_REG_WRITE(ah, AR_QUIET2, period | (duration << AR_QUIET2_QUIET_DUR_S));
OS_REG_WRITE(ah, AR_QUIET2, SM(100, AR_QUIET2_QUIET_PER) |
OS_REG_WRITE(ah, AR_QUIET2, SM(duration, AR_QUIET2_QUIET_DUR));
OS_REG_WRITE(ah, AR_QUIET2,