r8169: check ALDPS bit and disable it if enabled for the 8168g

Windows driver will enable ALDPS function, but linux driver and firmware
do not have any configuration related to ALDPS function for 8168g.
So restart system to linux and remove the NIC cable, LAN enter ALDPS,
then LAN RX will be disabled.

This issue can be easily reproduced on dual boot windows and linux
system with RTL_GIGA_MAC_VER_40 chip.

Realtek said, ALDPS function can be disabled by configuring to PHY,
switch to page 0x0A43, reg0x10 bit2=0.

Signed-off-by: David Chang <dchang@suse.com>
Acked-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 799387570766b6642ad4fdbc13f917acd358887a..c737f0ea5de751b7de9b1cb710fb101dc170ee41 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3465,6 +3465,11 @@ static void rtl8168g_1_hw_phy_config(struct rtl8169_private *tp)
        rtl_writephy(tp, 0x14, 0x9065);
        rtl_writephy(tp, 0x14, 0x1065);
 
+       /* Check ALDPS bit, disable it if enabled */
+       rtl_writephy(tp, 0x1f, 0x0a43);
+       if (rtl_readphy(tp, 0x10) & 0x0004)
+               rtl_w1w0_phy(tp, 0x10, 0x0000, 0x0004);
+
        rtl_writephy(tp, 0x1f, 0x0000);
 }