phy.c

		if (phydev->link) {
			phydev->state = PHY_RUNNING;
			phy_link_up(phydev);
		} else {
			phydev->state = PHY_NOLINK;
			phy_link_down(phydev, true);
		}

		if (phy_interrupt_is_valid(phydev))
			err = phy_config_interrupt(phydev,
						   PHY_INTERRUPT_ENABLED);
		break;
	case PHY_HALTED:
		if (phydev->link) {
			phydev->link = 0;
			phy_link_down(phydev, true);
			do_suspend = true;
		}
		break;
	case PHY_RESUMING:
		if (AUTONEG_ENABLE == phydev->autoneg) {
			err = phy_aneg_done(phydev);
			if (err < 0)
				break;

			/* err > 0 if AN is done.
			 * Otherwise, it's 0, and we're  still waiting for AN
			 */
			if (err > 0) {
				err = phy_read_status(phydev);
				if (err)
					break;

				if (phydev->link) {
					phydev->state = PHY_RUNNING;
					phy_link_up(phydev);
				} else	{
					phydev->state = PHY_NOLINK;
					phy_link_down(phydev, false);
				}
			} else {
				phydev->state = PHY_AN;
				phydev->link_timeout = PHY_AN_TIMEOUT;
			}
		} else {
			err = phy_read_status(phydev);
			if (err)
				break;

			if (phydev->link) {
				phydev->state = PHY_RUNNING;
				phy_link_up(phydev);
			} else	{
				phydev->state = PHY_NOLINK;
				phy_link_down(phydev, false);
			}
		}
		break;
	}

	mutex_unlock(&phydev->lock);

	if (needs_aneg)
		err = phy_start_aneg_priv(phydev, false);
	else if (do_suspend)
		phy_suspend(phydev);

	if (err < 0)
		phy_error(phydev);

	if (old_state != phydev->state)
		phydev_dbg(phydev, "PHY state change %s -> %s\n",
			   phy_state_to_str(old_state),
			   phy_state_to_str(phydev->state));

	/* Only re-schedule a PHY state machine change if we are polling the
	 * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
	 * between states from phy_mac_interrupt()
	 */
	if (phydev->irq == PHY_POLL)
		queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
				   PHY_STATE_TIME * HZ);
}

/**
 * phy_mac_interrupt - MAC says the link has changed
 * @phydev: phy_device struct with changed link
 * @new_link: Link is Up/Down.
 *
 * Description: The MAC layer is able indicate there has been a change
 *   in the PHY link status. Set the new link status, and trigger the
 *   state machine, work a work queue.
 */
void phy_mac_interrupt(struct phy_device *phydev, int new_link)
{
	phydev->link = new_link;

	/* Trigger a state machine change */
	queue_work(system_power_efficient_wq, &phydev->phy_queue);
}
EXPORT_SYMBOL(phy_mac_interrupt);

/**
 * phy_init_eee - init and check the EEE feature
 * @phydev: target phy_device struct
 * @clk_stop_enable: PHY may stop the clock during LPI
 *
 * Description: it checks if the Energy-Efficient Ethernet (EEE)
 * is supported by looking at the MMD registers 3.20 and 7.60/61
 * and it programs the MMD register 3.0 setting the "Clock stop enable"
 * bit if required.
 */
int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
{
	if (!phydev->drv)
		return -EIO;

	/* According to 802.3az,the EEE is supported only in full duplex-mode.
	 */
	if (phydev->duplex == DUPLEX_FULL) {
		int eee_lp, eee_cap, eee_adv;
		u32 lp, cap, adv;
		int status;

		/* Read phy status to properly get the right settings */
		status = phy_read_status(phydev);
		if (status)
			return status;

		/* First check if the EEE ability is supported */
		eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
		if (eee_cap <= 0)
			goto eee_exit_err;

		cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
		if (!cap)
			goto eee_exit_err;

		/* Check which link settings negotiated and verify it in
		 * the EEE advertising registers.
		 */
		eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
		if (eee_lp <= 0)
			goto eee_exit_err;

		eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
		if (eee_adv <= 0)
			goto eee_exit_err;

		adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
		lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
		if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
			goto eee_exit_err;

		if (clk_stop_enable) {
			/* Configure the PHY to stop receiving xMII
			 * clock while it is signaling LPI.
			 */
			int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
			if (val < 0)
				return val;

			val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
			phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
		}

		return 0; /* EEE supported */
	}
eee_exit_err:
	return -EPROTONOSUPPORT;
}
EXPORT_SYMBOL(phy_init_eee);

/**
 * phy_get_eee_err - report the EEE wake error count
 * @phydev: target phy_device struct
 *
 * Description: it is to report the number of time where the PHY
 * failed to complete its normal wake sequence.
 */
int phy_get_eee_err(struct phy_device *phydev)
{
	if (!phydev->drv)
		return -EIO;

	return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
}
EXPORT_SYMBOL(phy_get_eee_err);

/**
 * phy_ethtool_get_eee - get EEE supported and status
 * @phydev: target phy_device struct
 * @data: ethtool_eee data
 *
 * Description: it reportes the Supported/Advertisement/LP Advertisement
 * capabilities.
 */
int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
{
	int val;

	if (!phydev->drv)
		return -EIO;

	/* Get Supported EEE */
	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
	if (val < 0)
		return val;
	data->supported = mmd_eee_cap_to_ethtool_sup_t(val);

	/* Get advertisement EEE */
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
	if (val < 0)
		return val;
	data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);

	/* Get LP advertisement EEE */
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
	if (val < 0)
		return val;
	data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);

	return 0;
}
EXPORT_SYMBOL(phy_ethtool_get_eee);

/**
 * phy_ethtool_set_eee - set EEE supported and status
 * @phydev: target phy_device struct
 * @data: ethtool_eee data
 *
 * Description: it is to program the Advertisement EEE register.
 */
int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
{
	int cap, old_adv, adv, ret;

	if (!phydev->drv)
		return -EIO;

	/* Get Supported EEE */
	cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
	if (cap < 0)
		return cap;

	old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
	if (old_adv < 0)
		return old_adv;

	adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;

	/* Mask prohibited EEE modes */
	adv &= ~phydev->eee_broken_modes;

	if (old_adv != adv) {
		ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
		if (ret < 0)
			return ret;

		/* Restart autonegotiation so the new modes get sent to the
		 * link partner.
		 */
		ret = phy_restart_aneg(phydev);
		if (ret < 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL(phy_ethtool_set_eee);

int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
{
	if (phydev->drv && phydev->drv->set_wol)
		return phydev->drv->set_wol(phydev, wol);

	return -EOPNOTSUPP;
}
EXPORT_SYMBOL(phy_ethtool_set_wol);

void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
{
	if (phydev->drv && phydev->drv->get_wol)
		phydev->drv->get_wol(phydev, wol);
}
EXPORT_SYMBOL(phy_ethtool_get_wol);

int phy_ethtool_get_link_ksettings(struct net_device *ndev,
				   struct ethtool_link_ksettings *cmd)
{
	struct phy_device *phydev = ndev->phydev;

	if (!phydev)
		return -ENODEV;

	phy_ethtool_ksettings_get(phydev, cmd);

	return 0;
}
EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);

int phy_ethtool_set_link_ksettings(struct net_device *ndev,
				   const struct ethtool_link_ksettings *cmd)
{
	struct phy_device *phydev = ndev->phydev;

	if (!phydev)
		return -ENODEV;

	return phy_ethtool_ksettings_set(phydev, cmd);
}
EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);

int phy_ethtool_nway_reset(struct net_device *ndev)
{
	struct phy_device *phydev = ndev->phydev;

	if (!phydev)
		return -ENODEV;

	if (!phydev->drv)
		return -EIO;

	return phy_restart_aneg(phydev);
}
EXPORT_SYMBOL(phy_ethtool_nway_reset);