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path: root/drivers/net/phy/smsc.c
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Diffstat (limited to 'drivers/net/phy/smsc.c')
-rw-r--r--drivers/net/phy/smsc.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 6d6192316b3..88e3991464e 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -56,6 +56,32 @@ static int smsc_phy_config_init(struct phy_device *phydev)
return smsc_phy_ack_interrupt (phydev);
}
+static int lan87xx_config_init(struct phy_device *phydev)
+{
+ /*
+ * Make sure the EDPWRDOWN bit is NOT set. Setting this bit on
+ * LAN8710/LAN8720 PHY causes the PHY to misbehave, likely due
+ * to a bug on the chip.
+ *
+ * When the system is powered on with the network cable being
+ * disconnected all the way until after ifconfig ethX up is
+ * issued for the LAN port with this PHY, connecting the cable
+ * afterwards does not cause LINK change detection, while the
+ * expected behavior is the Link UP being detected.
+ */
+ int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
+ if (rc < 0)
+ return rc;
+
+ rc &= ~MII_LAN83C185_EDPWRDOWN;
+
+ rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS, rc);
+ if (rc < 0)
+ return rc;
+
+ return smsc_phy_ack_interrupt(phydev);
+}
+
static int lan911x_config_init(struct phy_device *phydev)
{
return smsc_phy_ack_interrupt(phydev);
@@ -162,7 +188,7 @@ static struct phy_driver smsc_phy_driver[] = {
/* basic functions */
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,
- .config_init = smsc_phy_config_init,
+ .config_init = lan87xx_config_init,
/* IRQ related */
.ack_interrupt = smsc_phy_ack_interrupt,