net: mvpp2: fix 10 Mbit/s usage

This commit is similar to commit 4d12bc63ab5e ("net: mvneta: fix
operation in 10 Mbit/s mode"), but this time for the mvpp2 driver. The
driver was properly taking into account the 1 Gbit/s and 100 Mbit/s
speeds, but not the 10 Mbit/s, which was handled as 100
Mbit/s. However, the MVPP2_GMAC_CONFIG_MII_SPEED bit in the
MVPP2_GMAC_AUTONEG_CONFIG register must remain cleared to allow 10
Mbit/s operation. This commit therefore fixes 10 Mbit/s operation.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -4842,7 +4842,7 @@ static void mvpp2_link_event(struct net_device *dev)
 
 			if (phydev->speed == SPEED_1000)
 				val |= MVPP2_GMAC_CONFIG_GMII_SPEED;
-			else
+			else if (phydev->speed == SPEED_100)
 				val |= MVPP2_GMAC_CONFIG_MII_SPEED;
 
 			writel(val, port->base + MVPP2_GMAC_AUTONEG_CONFIG);