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usbnet: smsc95xx: fix link detection for disabled autonegotiation

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To detect link status up/down for connections where autonegotiation is
explicitly disabled, we don't get an irq but need to poll the status
register for link up/down detection.
This patch adds a workqueue to poll for link status.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Fritz 2016-05-26 04:06:47 +02:00 committed by David S. Miller
parent f00e35e259
commit d69d169493
1 changed files with 51 additions and 0 deletions
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51
drivers/net/usb/smsc95xx.c
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@ -61,6 +61,8 @@
#define SUSPEND_ALLMODES (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
#define CARRIER_CHECK_DELAY (2 * HZ)
struct smsc95xx_priv {
u32 mac_cr;
u32 hash_hi;
@ -69,6 +71,9 @@ struct smsc95xx_priv {
spinlock_t mac_cr_lock;
u8 features;
u8 suspend_flags;
bool link_ok;
struct delayed_work carrier_check;
struct usbnet *dev;
};
static bool turbo_mode = true;
@ -624,6 +629,44 @@ static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
intdata);
}
static void set_carrier(struct usbnet *dev, bool link)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
if (pdata->link_ok == link)
return;
pdata->link_ok = link;
if (link)
usbnet_link_change(dev, 1, 0);
else
usbnet_link_change(dev, 0, 0);
}
static void check_carrier(struct work_struct *work)
{
struct smsc95xx_priv *pdata = container_of(work, struct smsc95xx_priv,
carrier_check.work);
struct usbnet *dev = pdata->dev;
int ret;
if (pdata->suspend_flags != 0)
return;
ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMSR);
if (ret < 0) {
netdev_warn(dev->net, "Failed to read MII_BMSR\n");
return;
}
if (ret & BMSR_LSTATUS)
set_carrier(dev, 1);
else
set_carrier(dev, 0);
schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
}
/* Enable or disable Tx & Rx checksum offload engines */
static int smsc95xx_set_features(struct net_device *netdev,
netdev_features_t features)
@ -1165,13 +1208,20 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
dev->net->flags |= IFF_MULTICAST;
dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
pdata->dev = dev;
INIT_DELAYED_WORK(&pdata->carrier_check, check_carrier);
schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
return 0;
}
static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
if (pdata) {
cancel_delayed_work(&pdata->carrier_check);
netif_dbg(dev, ifdown, dev->net, "free pdata\n");
kfree(pdata);
pdata = NULL;
@ -1695,6 +1745,7 @@ static int smsc95xx_resume(struct usb_interface *intf)
/* do this first to ensure it's cleared even in error case */
pdata->suspend_flags = 0;
schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
if (suspend_flags & SUSPEND_ALLMODES) {
/* clear wake-up sources */