[PATCH net] r8169: fix rtl8168h wol fail

[Chunhao Lin <hau@realtek.com>]

rtl8168h has an application that it will connect to rtl8211fs through mdi
interface. And rtl8211fs will connect to fiber through serdes interface.
In this application, rtl8168h revision id will be set to 0x2a.

Because rtl8211fs's firmware will set link capability to 100M and GIGA
when link is from off to on. So when system suspend and wol is enabled,
rtl8168h will speed down to 100M (because rtl8211fs advertise 100M and GIGA
to rtl8168h). If the link speed between rtl81211fs and fiber is GIGA.
The link speed between rtl8168h and fiber will mismatch. That will cause
wol fail.

In this patch, if rtl8168h is in this kind of application, driver will not
speed down phy when wol is enabled.

Signed-off-by: Chunhao Lin <hau@realtek.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 24592d972523..83d017369ae7 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1199,6 +1199,12 @@ static enum rtl_dash_type rtl_check_dash(struct rtl8169_private *tp)
 	}
 }
 
+static bool rtl_mdi_connect_to_phy(struct rtl8169_private *tp)
+{
+	return tp->mac_version == RTL_GIGA_MAC_VER_46 &&
+		tp->pci_dev->revision == 0x2a;
+}
+
 static void rtl_set_d3_pll_down(struct rtl8169_private *tp, bool enable)
 {
 	switch (tp->mac_version) {
@@ -2453,7 +2459,8 @@ static void rtl_prepare_power_down(struct rtl8169_private *tp)
 		rtl_ephy_write(tp, 0x19, 0xff64);
 
 	if (device_may_wakeup(tp_to_dev(tp))) {
-		phy_speed_down(tp->phydev, false);
+		if (!rtl_mdi_connect_to_phy(tp))
+			phy_speed_down(tp->phydev, false);
 		rtl_wol_enable_rx(tp);
 	}
 }
-- 
2.39.0