bcm63xx_enet: check 1000BASE-T advertisement configuration

If a gigabit ethernet PHY is connected to a fast ethernet MAC,
then it can detect 1000 support from the partner but not use it.

This results in a forced speed of 1000 and RX/TX failure.

Check for 1000BASE-T support and then check the advertisement
configuration before setting the MAC speed to 1000mbit.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
index a7f2cc3e485eebfae962fe24cfc1142021a74cde..4183c2abeeeb2dc206f2ca4aa90d88279e2eb6d9 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -2049,7 +2049,7 @@ static void swphy_poll_timer(unsigned long data)
 
        for (i = 0; i < priv->num_ports; i++) {
                struct bcm63xx_enetsw_port *port;
-               int val, j, up, advertise, lpa, lpa2, speed, duplex, media;
+               int val, j, up, advertise, lpa, speed, duplex, media;
                int external_phy = bcm_enet_port_is_rgmii(i);
                u8 override;
 
@@ -2092,22 +2092,27 @@ static void swphy_poll_timer(unsigned long data)
                lpa = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
                                           MII_LPA);
 
-               lpa2 = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
-                                           MII_STAT1000);
-
                /* figure out media and duplex from advertise and LPA values */
                media = mii_nway_result(lpa & advertise);
                duplex = (media & ADVERTISE_FULL) ? 1 : 0;
-               if (lpa2 & LPA_1000FULL)
-                       duplex = 1;
-
-               if (lpa2 & (LPA_1000FULL | LPA_1000HALF))
-                       speed = 1000;
-               else {
-                       if (media & (ADVERTISE_100FULL | ADVERTISE_100HALF))
-                               speed = 100;
-                       else
-                               speed = 10;
+
+               if (media & (ADVERTISE_100FULL | ADVERTISE_100HALF))
+                       speed = 100;
+               else
+                       speed = 10;
+
+               if (val & BMSR_ESTATEN) {
+                       advertise = bcmenet_sw_mdio_read(priv, external_phy,
+                                               port->phy_id, MII_CTRL1000);
+
+                       lpa = bcmenet_sw_mdio_read(priv, external_phy,
+                                               port->phy_id, MII_STAT1000);
+
+                       if (advertise & (ADVERTISE_1000FULL | ADVERTISE_1000HALF)
+                                       && lpa & (LPA_1000FULL | LPA_1000HALF)) {
+                               speed = 1000;
+                               duplex = (lpa & LPA_1000FULL);
+                       }
                }
 
                dev_info(&priv->pdev->dev,