[PATCH] emac: add support for platform-specific unsupported PHY features

This patch adds support to the ibm_emac driver for platform-specific
unsupported PHY features.

The patch attempts to determine the highest speed and duplex when
autonegotiation is unsupported.

Signed-off-by: Wade Farnsworth <wfarnsworth@mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/ibm_emac/ibm_emac_core.c

@@ -1875,13 +1875,44 @@ static int emac_init_device(struct ocp_device *ocpdev, struct ibm_ocp_mal *mal)
 		rc = -ENODEV;
 		goto bail;
 	}
+
+	/* Disable any PHY features not supported by the platform */
+	ep->phy_mii.def->features &= ~emacdata->phy_feat_exc;
 
 	/* Setup initial PHY config & startup aneg */
 	if (ep->phy_mii.def->ops->init)
 		ep->phy_mii.def->ops->init(&ep->phy_mii);
 	netif_carrier_off(ndev);
 	if (ep->phy_mii.def->features & SUPPORTED_Autoneg)
 		ep->want_autoneg = 1;
+	else {
+		ep->want_autoneg = 0;
+
+		/* Select highest supported speed/duplex */
+		if (ep->phy_mii.def->features & SUPPORTED_1000baseT_Full) {
+			ep->phy_mii.speed = SPEED_1000;
+			ep->phy_mii.duplex = DUPLEX_FULL;
+		} else if (ep->phy_mii.def->features & 
+			   SUPPORTED_1000baseT_Half) {
+			ep->phy_mii.speed = SPEED_1000;
+			ep->phy_mii.duplex = DUPLEX_HALF;
+		} else if (ep->phy_mii.def->features & 
+			   SUPPORTED_100baseT_Full) {
+			ep->phy_mii.speed = SPEED_100;
+			ep->phy_mii.duplex = DUPLEX_FULL;
+		} else if (ep->phy_mii.def->features & 
+			   SUPPORTED_100baseT_Half) {
+			ep->phy_mii.speed = SPEED_100;
+			ep->phy_mii.duplex = DUPLEX_HALF;
+		} else if (ep->phy_mii.def->features & 
+			   SUPPORTED_10baseT_Full) {
+			ep->phy_mii.speed = SPEED_10;
+			ep->phy_mii.duplex = DUPLEX_FULL;
+		} else {
+			ep->phy_mii.speed = SPEED_10;
+			ep->phy_mii.duplex = DUPLEX_HALF;
+		}
+	}
 	emac_start_link(ep, NULL);
 
 	/* read the MAC Address */