net: sxgbe: using lpi_timer for Twake timer

[Oleksij Rempel]

For archive:

static void  sxgbe_set_eee_timer(void __iomem *ioaddr,
				 const int ls, const int tw)
{
	int value = ((tw & 0xffff)) | ((ls & 0x7ff) << 16);

	/* Program the timers in the LPI timer control register:
	 * LS: minimum time (ms) for which the link
	 *  status from PHY should be ok before transmitting
	 *  the LPI pattern.
	 * TW: minimum time (us) for which the core waits
	 *  after it has stopped transmitting the LPI pattern.
	 */
	writel(value, ioaddr + SXGBE_CORE_LPI_TIMER_CTRL);
}

bool sxgbe_eee_init(struct sxgbe_priv_data * const priv)
{
....
	/* MAC core supports the EEE feature. */
	if (priv->hw_cap.eee) {
		/* Check if the PHY supports EEE */
		if (phy_init_eee(ndev->phydev, true))
			return false;

		timer_setup(&priv->eee_ctrl_timer, sxgbe_eee_ctrl_timer, 0);
		priv->eee_ctrl_timer.expires = SXGBE_LPI_TIMER(eee_timer);
		add_timer(&priv->eee_ctrl_timer);

		priv->hw->mac->set_eee_timer(priv->ioaddr,
					     SXGBE_DEFAULT_LPI_TIMER,
					     priv->tx_lpi_timer);
                                                   ^^^^^^^^^^^^
                                                   LPI timer is used for
						   Twake timer.
}

In case user configures lpi_timer value to too low, it will case frame
corruption instead of expected performance drop.

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