This is a note to let you know that I've just added the patch titled
r8169: fix issue caused by buggy BIOS on certain boards with RTL8168d
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
r8169-fix-issue-caused-by-buggy-bios-on-certain-boards-with-rtl8168d.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5d872c9f46bd2ea3524af3c2420a364a13667135 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Sat, 30 Mar 2024 12:49:02 +0100
Subject: r8169: fix issue caused by buggy BIOS on certain boards with RTL8168d
From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
commit 5d872c9f46bd2ea3524af3c2420a364a13667135 upstream.
On some boards with this chip version the BIOS is buggy and misses
to reset the PHY page selector. This results in the PHY ID read
accessing registers on a different page, returning a more or
less random value. Fix this by resetting the page selector first.
Fixes: f1e911d5d0df ("r8169: add basic phylib support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/r/64f2055e-98b8-45ec-8568-665e3d54d4e6@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/realtek/r8169_main.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -7303,6 +7303,15 @@ static int r8169_mdio_register(struct rt
struct mii_bus *new_bus;
int ret;
+ /* On some boards with this chip version the BIOS is buggy and misses
+ * to reset the PHY page selector. This results in the PHY ID read
+ * accessing registers on a different page, returning a more or
+ * less random value. Fix this by resetting the page selector first.
+ */
+ if (tp->mac_version == RTL_GIGA_MAC_VER_25 ||
+ tp->mac_version == RTL_GIGA_MAC_VER_26)
+ r8169_mdio_write(tp, 0x1f, 0);
+
new_bus = devm_mdiobus_alloc(&pdev->dev);
if (!new_bus)
return -ENOMEM;
Patches currently in stable-queue which might be from hkallweit1@xxxxxxxxx are
queue-4.19/r8169-fix-issue-caused-by-buggy-bios-on-certain-boards-with-rtl8168d.patch
