SM502_POWER_MODE0_GATE
VAC_READ(sc, SM502_POWER_MODE0_GATE),
VAC_WRITE(sc, SM502_POWER_MODE0_GATE,
VAC_READ(sc, SM502_POWER_MODE0_GATE) |
voyager_twiddle_bits(cookie, SM502_POWER_MODE0_GATE, m_and, m_or)