IGC_TCTL
tctl = IGC_READ_REG(&sc->hw, IGC_TCTL);
IGC_WRITE_REG(&sc->hw, IGC_TCTL, tctl);
regs_buff[11] = IGC_READ_REG(hw, 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);