BACKPORT: r8169: fix auto speed down issue

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@realtek.com>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit e2409d83434d77874b461b78af6a19cd6e6a1280)

BUG=chrome-os-partner:18211.
TEST=manual. Test ethernet plug/unplug, verify link status detection.

Change-Id: I3166710a102ab9c2aef6590717d500c02fca3cac
Reviewed-on: https://gerrit.chromium.org/gerrit/48361
Tested-by: Bowgo Tsai <bowgotsai@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Queue: Bowgo Tsai <bowgotsai@chromium.org>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 1a6dc3a..07a2a88 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3488,6 +3488,30 @@ static void __devinit 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;
@@ -3511,9 +3535,7 @@ 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;