phy/marvell: Make non-aneg speed/duplex forcing work for 88E1111 PHYs

According to specs, when auto-negotiation is disabled, Marvell PHYs need
a software reset after changing speed/duplex forcing bits. Otherwise,
the modified bits have no effect.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index dd6f54d1b495..6f69b9ba0df8 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -155,8 +155,27 @@ static int marvell_config_aneg(struct phy_device *phydev)
                 return err;
 
         err = genphy_config_aneg(phydev);
+        if (err < 0)
+                return err;
 
-        return err;
+        if (phydev->autoneg != AUTONEG_ENABLE) {
+                int bmcr;
+
+                /*
+                 * A write to speed/duplex bits (that is performed by
+                 * genphy_config_aneg() call above) must be followed by
+                 * a software reset. Otherwise, the write has no effect.
+                 */
+                bmcr = phy_read(phydev, MII_BMCR);
+                if (bmcr < 0)
+                        return bmcr;
+
+                err = phy_write(phydev, MII_BMCR, bmcr | BMCR_RESET);
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
 }
 
 static int m88e1121_config_aneg(struct phy_device *phydev)