netdev - [PATCH net] r8169: disable ALDPS per default for RTL8125

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Message-ID: <778b9d86-05c4-4856-be59-cde4487b9e52@gmail.com>
Date: Wed, 11 Sep 2024 15:51:11 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Paolo Abeni <pabeni@...hat.com>, David Miller <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc: En-Wei WU <en-wei.wu@...onical.com>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net] r8169: disable ALDPS per default for RTL8125

En-Wei reported that traffic breaks if cable is unplugged for more
than 3s and then re-plugged. This was supposed to be fixed by
621735f59064 ("r8169: fix rare issue with broken rx after link-down on
RTL8125"). But apparently this didn't fix the issue for everybody.
The 3s threshold rang a bell, as this is the delay after which ALDPS
kicks in. And indeed disabling ALDPS fixes the issue for this user.
Maybe this fixes the issue in general. In a follow-up step we could
remove the first fix attempt and see whether anybody complains.

Fixes: f1bce4ad2f1c ("r8169: add support for RTL8125")
Tested-by: En-Wei WU <en-wei.wu@...onical.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_phy_config.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169_phy_config.c b/drivers/net/ethernet/realtek/r8169_phy_config.c
index 2c8845e08..cf29b1208 100644
--- a/drivers/net/ethernet/realtek/r8169_phy_config.c
+++ b/drivers/net/ethernet/realtek/r8169_phy_config.c
@@ -1060,6 +1060,7 @@ static void rtl8125a_2_hw_phy_config(struct rtl8169_private *tp,
 	phy_modify_paged(phydev, 0xa86, 0x15, 0x0001, 0x0000);
 	rtl8168g_enable_gphy_10m(phydev);
 
+	rtl8168g_disable_aldps(phydev);
 	rtl8125a_config_eee_phy(phydev);
 }
 
@@ -1099,6 +1100,7 @@ static void rtl8125b_hw_phy_config(struct rtl8169_private *tp,
 	phy_modify_paged(phydev, 0xbf8, 0x12, 0xe000, 0xa000);
 
 	rtl8125_legacy_force_mode(phydev);
+	rtl8168g_disable_aldps(phydev);
 	rtl8125b_config_eee_phy(phydev);
 }
 
-- 
2.46.0