r8169: perform a PHY reset before any other operation at boot time

Realtek's 8139/810x (0x8136) PCI-E comes with a touchy PHY.
A big heavy reset seems to calm it down.

Fix for http://bugzilla.kernel.org/show_bug.cgi?id=7378.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Darren Salt <linux@youmustbejoking.demon.co.uk>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index b977ed85ff39..45d3ca431957 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -571,8 +571,8 @@ static void rtl8169_xmii_reset_enable(void __iomem *ioaddr)
 {
         unsigned int val;
 
-        val = (mdio_read(ioaddr, MII_BMCR) | BMCR_RESET) & 0xffff;
-        mdio_write(ioaddr, MII_BMCR, val);
+        mdio_write(ioaddr, MII_BMCR, BMCR_RESET);
+        val = mdio_read(ioaddr, MII_BMCR);
 }
 
 static void rtl8169_check_link_status(struct net_device *dev,
@@ -1406,6 +1406,22 @@ static void rtl8169_release_board(struct pci_dev *pdev, struct net_device *dev,
         free_netdev(dev);
 }
 
+static void rtl8169_phy_reset(struct net_device *dev,
+                              struct rtl8169_private *tp)
+{
+        void __iomem *ioaddr = tp->mmio_addr;
+        int i;
+
+        tp->phy_reset_enable(ioaddr);
+        for (i = 0; i < 100; i++) {
+                if (!tp->phy_reset_pending(ioaddr))
+                        return;
+                msleep(1);
+        }
+        if (netif_msg_link(tp))
+                printk(KERN_ERR "%s: PHY reset failed.\n", dev->name);
+}
+
 static void rtl8169_init_phy(struct net_device *dev, struct rtl8169_private *tp)
 {
         void __iomem *ioaddr = tp->mmio_addr;
@@ -1434,6 +1450,8 @@ static void rtl8169_init_phy(struct net_device *dev, struct rtl8169_private *tp)
 
         rtl8169_link_option(board_idx, &autoneg, &speed, &duplex);
 
+        rtl8169_phy_reset(dev, tp);
+
         rtl8169_set_speed(dev, autoneg, speed, duplex);
 
         if ((RTL_R8(PHYstatus) & TBI_Enable) && netif_msg_link(tp))