MAX_COMBINED_POWER
chan_pwr = min_t(int, channel->max_power * 2, MAX_COMBINED_POWER);
reg->power_limit = min_t(u32, limit, MAX_COMBINED_POWER);
channel->max_power = MAX_COMBINED_POWER / 2;
regulatory->power_limit = MAX_COMBINED_POWER;
ath9k_hw_set_txpowerlimit(ah, MAX_COMBINED_POWER, true);