linux-kernel - Re: r8169 mac address change (was Re: [0/3] 2.6.19-rc2: known regressions)

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Date:	Tue, 31 Oct 2006 00:44:25 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Linus Torvalds <torvalds@...l.org>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>, Jeff Garzik <jgarzik@...ox.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tmattox@...il.com, spiky.kiwi@...il.com, r.bhatia@...x.at
Subject: Re: r8169 mac address change (was Re: [0/3] 2.6.19-rc2: known regressions)

Guennadi Liakhovetski <g.liakhovetski@....de> :
[...]
> The "seems" above was the key word. Once again I had a case, when after 
> re-compiling the kernel again with the disabled call to 
> __rtl8169_set_mac_addr only ping worked. And a power-off was required to 
> recover. So, that phy_reset doesn't seem to be very safe either.

Can you replace phy_reset by the patch below and try it twice ?

It's interesting to know if it does not always behave the same.

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index f1c7575..4b05dea 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -570,8 +570,8 @@ static void rtl8169_xmii_reset_enable(vo
 {
 	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,
@@ -1440,6 +1440,22 @@ static void rtl8169_release_board(struct
 	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;
@@ -1468,6 +1484,8 @@ static void rtl8169_init_phy(struct net_
 
 	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))
-
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