IGC_TCTL
IGC_WRITE_REG(hw, IGC_TCTL, IGC_TCTL_PSP);
tctl = IGC_READ_REG(hw, IGC_TCTL);
IGC_WRITE_REG(hw, IGC_TCTL, tctl);
val = igc_read32(igc, IGC_TCTL);
igc_write32(igc, IGC_TCTL, val);