DOVE_PMU_CPUSDFSCR
control = READ_PMUREG(sc, DOVE_PMU_CPUSDFSCR);
WRITE_PMUREG(sc, DOVE_PMU_CPUSDFSCR, control);
WRITE_PMUREG(sc, DOVE_PMU_CPUSDFSCR,
READ_PMUREG(sc, DOVE_PMU_CPUSDFSCR) | DOVE_PMU_CPUSDFSCR_DFSEN);