MC_CTL2_THRESHOLD
cur_threshold = ctl & MC_CTL2_THRESHOLD;
ctl &= ~MC_CTL2_THRESHOLD;
ctl &= ~MC_CTL2_THRESHOLD;
ctl &= ~MC_CTL2_THRESHOLD;
cc->max_threshold = ctl & MC_CTL2_THRESHOLD;
ctl &= ~MC_CTL2_THRESHOLD;
ctl &= ~MC_CTL2_THRESHOLD;