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Commit 46ed892b authored by Yuiko Oshino's avatar Yuiko Oshino Committed by Greg Kroah-Hartman
Browse files

smsc75xx: Add workaround for gigabit link up hardware errata. 



[ Upstream commit d461e3da905332189aad546b2ad9adbe6071c7cc ]

In certain conditions, the device may not be able to link in gigabit mode. This software workaround ensures that the device will not enter the failure state.

Fixes: d0cad871 ("SMSC75XX USB 2.0 Gigabit Ethernet Devices")
Signed-off-by: default avatarYuiko Oshino <yuiko.oshino@microchip.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 766c02b6

drivers/net/usb/smsc75xx.c

+62 −0
Original line number Diff line number Diff line
@@ -81,6 +81,9 @@ static bool turbo_mode = true; 
module_param(turbo_mode, bool, 0644);

MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");



static int smsc75xx_link_ok_nopm(struct usbnet *dev);

static int smsc75xx_phy_gig_workaround(struct usbnet *dev);



static int __must_check __smsc75xx_read_reg(struct usbnet *dev, u32 index,

					    u32 *data, int in_pm)

{
@@ -840,6 +843,9 @@ static int smsc75xx_phy_initialize(struct usbnet *dev) 
		return -EIO;

	}



	/* phy workaround for gig link */

	smsc75xx_phy_gig_workaround(dev);



	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,

		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |

		ADVERTISE_PAUSE_ASYM);
@@ -978,6 +984,62 @@ static int smsc75xx_wait_ready(struct usbnet *dev, int in_pm) 
	return -EIO;

}



static int smsc75xx_phy_gig_workaround(struct usbnet *dev)

{

	struct mii_if_info *mii = &dev->mii;

	int ret = 0, timeout = 0;

	u32 buf, link_up = 0;



	/* Set the phy in Gig loopback */

	smsc75xx_mdio_write(dev->net, mii->phy_id, MII_BMCR, 0x4040);



	/* Wait for the link up */

	do {

		link_up = smsc75xx_link_ok_nopm(dev);

		usleep_range(10000, 20000);

		timeout++;

	} while ((!link_up) && (timeout < 1000));



	if (timeout >= 1000) {

		netdev_warn(dev->net, "Timeout waiting for PHY link up\n");

		return -EIO;

	}



	/* phy reset */

	ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);

	if (ret < 0) {

		netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", ret);

		return ret;

	}



	buf |= PMT_CTL_PHY_RST;



	ret = smsc75xx_write_reg(dev, PMT_CTL, buf);

	if (ret < 0) {

		netdev_warn(dev->net, "Failed to write PMT_CTL: %d\n", ret);

		return ret;

	}



	timeout = 0;

	do {

		usleep_range(10000, 20000);

		ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);

		if (ret < 0) {

			netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n",

				    ret);

			return ret;

		}

		timeout++;

	} while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));



	if (timeout >= 100) {

		netdev_warn(dev->net, "timeout waiting for PHY Reset\n");

		return -EIO;

	}



	return 0;

}



static int smsc75xx_reset(struct usbnet *dev)

{

	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);