netdev - [PATCH 3.8-stable] r8169: fix auto speed down issue

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Message-Id: <1365301070-4788-1-git-send-email-jhbird.choi@samsung.com>
Date:	Sun,  7 Apr 2013 11:17:50 +0900
From:	Jonghwan Choi <jhbird.choi@...il.com>
To:	Realtek linux nic maintainers <nic_swsd@...ltek.com>,
	hayeswang <hayeswang@...ltek.com>
Cc:	stable@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [PATCH 3.8-stable] r8169: fix auto speed down issue

From: hayeswang <hayeswang@...ltek.com>

This patch looks like it should be in the 3.8-stable tree, should we apply
it?

------------------

From: "hayeswang <hayeswang@...ltek.com>"

commit e2409d83434d77874b461b78af6a19cd6e6a1280 upstream

It would cause no link after suspending or shutdowning when the
nic changes the speed to 10M and connects to a link partner which
forces the speed to 100M.

Check the link partner ability to determine which speed to set.

Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
Acked-by: Francois Romieu <romieu@...zoreil.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
---
 drivers/net/ethernet/realtek/r8169.c |   28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 998974f..2d849da 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3819,6 +3819,30 @@ static void rtl_init_mdio_ops(struct rtl8169_private *tp)
 	}
 }
 
+static void rtl_speed_down(struct rtl8169_private *tp)
+{
+	u32 adv;
+	int lpa;
+
+	rtl_writephy(tp, 0x1f, 0x0000);
+	lpa = rtl_readphy(tp, MII_LPA);
+
+	if (lpa & (LPA_10HALF | LPA_10FULL))
+		adv = ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full;
+	else if (lpa & (LPA_100HALF | LPA_100FULL))
+		adv = ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full |
+		      ADVERTISED_100baseT_Half | ADVERTISED_100baseT_Full;
+	else
+		adv = ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full |
+		      ADVERTISED_100baseT_Half | ADVERTISED_100baseT_Full |
+		      (tp->mii.supports_gmii ?
+		       ADVERTISED_1000baseT_Half |
+		       ADVERTISED_1000baseT_Full : 0);
+
+	rtl8169_set_speed(tp->dev, AUTONEG_ENABLE, SPEED_1000, DUPLEX_FULL,
+			  adv);
+}
+
 static void rtl_wol_suspend_quirk(struct rtl8169_private *tp)
 {
 	void __iomem *ioaddr = tp->mmio_addr;
@@ -3849,9 +3873,7 @@ static bool rtl_wol_pll_power_down(struct rtl8169_private *tp)
 	if (!(__rtl8169_get_wol(tp) & WAKE_ANY))
 		return false;
 
-	rtl_writephy(tp, 0x1f, 0x0000);
-	rtl_writephy(tp, MII_BMCR, 0x0000);
-
+	rtl_speed_down(tp);
 	rtl_wol_suspend_quirk(tp);
 
 	return true;
-- 
1.7.10.4

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