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,