PCS_MR_CONTROL
ctl_reg = PCS_READ_8(sc, PCS_MR_CONTROL);
PCS_WRITE_8(sc, PCS_MR_CONTROL, ctl_reg);
ctl_reg = PCS_READ_8(sc, PCS_MR_CONTROL);
PCS_WRITE_8(sc, PCS_MR_CONTROL, ctl_reg);
PCS_WRITE_8(sc, PCS_MR_CONTROL, ctl_reg);