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

[ Upstream commit 1bac1072425c86f1ac85bd5967910706677ef8b3 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 7199d2a8dcf83bce8ba22c468a92a25fe2c8aaf1..e9b5d77a90dbf90491de74721e67a4ab4bb3bfd7 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3456,6 +3456,11 @@ 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);
 }