net: phy: smsc: Implement PHY config_init for LAN87xx

The LAN8710/LAN8720 chips do have broken the "FlexPWR" smart power-saving
capability. Enabling it leads to the PHY not being able to detect Link when
cold-started without cable connected. Thus, make sure this is disabled.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Christian Hohnstaedt <chohnstaedt@innominate.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 6d61923..88e3991 100644 (file)
--- 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,