macb: Don't restart autonegotiation if we already have link

Rework macb_phy_init so that it doesn't attempt to re-negotiate if the
link is already up.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

diff --git a/drivers/macb.c b/drivers/macb.c
index 43bb878..abe57ba 100644 (file)
--- a/drivers/macb.c
+++ b/drivers/macb.c
@@ -292,20 +292,11 @@ static int macb_recv(struct eth_device *netdev)
        return 0;
 }
 
-static int macb_phy_init(struct macb_device *macb)
+static void macb_phy_reset(struct macb_device *macb)
 {
        struct eth_device *netdev = &macb->netdev;
-       u32 ncfgr;
-       u16 phy_id, status, adv, lpa;
-       int media, speed, duplex;
        int i;
-
-       /* Check if the PHY is up to snuff... */
-       phy_id = macb_mdio_read(macb, MII_PHYSID1);
-       if (phy_id == 0xffff) {
-               printf("%s: No PHY present\n", netdev->name);
-               return 0;
-       }
+       u16 status, adv;
 
        adv = ADVERTISE_CSMA | ADVERTISE_ALL;
        macb_mdio_write(macb, MII_ADVERTISE, adv);
@@ -313,11 +304,6 @@ static int macb_phy_init(struct macb_device *macb)
        macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE
                                         | BMCR_ANRESTART));
 
-#if 0
-       for (i = 0; i < 9; i++)
-               printf("mii%d: 0x%04x\n", i, macb_mdio_read(macb, i));
-#endif
-
        for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
                status = macb_mdio_read(macb, MII_BMSR);
                if (status & BMSR_ANEGCOMPLETE)
@@ -330,13 +316,33 @@ static int macb_phy_init(struct macb_device *macb)
        else
                printf("%s: Autonegotiation timed out (status=0x%04x)\n",
                       netdev->name, status);
+}
+
+static int macb_phy_init(struct macb_device *macb)
+{
+       struct eth_device *netdev = &macb->netdev;
+       u32 ncfgr;
+       u16 phy_id, status, adv, lpa;
+       int media, speed, duplex;
+       int i;
+
+       /* Check if the PHY is up to snuff... */
+       phy_id = macb_mdio_read(macb, MII_PHYSID1);
+       if (phy_id == 0xffff) {
+               printf("%s: No PHY present\n", netdev->name);
+               return 0;
+       }
 
+       status = macb_mdio_read(macb, MII_BMSR);
        if (!(status & BMSR_LSTATUS)) {
+               /* Try to re-negotiate if we don't have link already. */
+               macb_phy_reset(macb);
+
                for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
-                       udelay(100);
                        status = macb_mdio_read(macb, MII_BMSR);
                        if (status & BMSR_LSTATUS)
                                break;
+                       udelay(100);
                }
        }
 
@@ -345,6 +351,7 @@ static int macb_phy_init(struct macb_device *macb)
                       netdev->name, status);
                return 0;
        } else {
+               adv = macb_mdio_read(macb, MII_ADVERTISE);
                lpa = macb_mdio_read(macb, MII_LPA);
                media = mii_nway_result(lpa & adv);
                speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)