---

yaml
---
r: 118333
b: refs/heads/master
c: bdb59f9
h: refs/heads/master
i:
  118331: 49fa7ae
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c132419e560a2ecd3c8cf77f9c37e103e74b3754
+refs/heads/master: bdb59f949d663b7e943fb5f40b2557af4314abf9

trunk/drivers/net/gianfar.c

@@ -591,6 +591,14 @@ static void gfar_configure_serdes(struct net_device *dev)
 	if (bus)
 		mutex_lock(&bus->mdio_lock);
 
+	/* If the link is already up, we must already be ok, and don't need to
+	 * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
+	 * everything for us?  Resetting it takes the link down and requires
+	 * several seconds for it to come back.
+	 */
+	if (gfar_local_mdio_read(regs, tbipa, MII_BMSR) & BMSR_LSTATUS)
+		goto done;
+
 	/* Single clk mode, mii mode off(for serdes communication) */
 	gfar_local_mdio_write(regs, tbipa, MII_TBICON, TBICON_CLK_SELECT);
 
@@ -601,6 +609,7 @@ static void gfar_configure_serdes(struct net_device *dev)
 	gfar_local_mdio_write(regs, tbipa, MII_BMCR, BMCR_ANENABLE |
 			BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
 
+	done:
 	if (bus)
 		mutex_unlock(&bus->mdio_lock);
 }