linux-kernel - [PATCH net-next] net: phy: realtek: fix in-band capabilities for 2.5G PHYs

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Message-ID: <20260113205557.503409-1-jan@3e8.eu>
Date: Tue, 13 Jan 2026 21:55:44 +0100
From: Jan Hoffmann <jan@....eu>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Michael Klein <michael@...sekall.de>,
	Daniel Golle <daniel@...rotopia.org>,
	Aleksander Jan Bajkowski <olek2@...pl>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Jan Hoffmann <jan@....eu>
Subject: [PATCH net-next] net: phy: realtek: fix in-band capabilities for 2.5G PHYs

It looks like the configuration of in-band AN only affects SGMII, and it
is always disabled for 2500Base-X. Adjust the reported capabilities
accordingly.

This is based on testing using OpenWrt on Zyxel XGS1010-12 rev A1 with
RTL8226-CG, and Zyxel XGS1210-12 rev B1 with RTL8221B-VB-CG. On these
devices, 2500Base-X in-band AN is known to work with some SFP modules
(containing an unknown PHY). However, with the built-in Realtek PHYs,
no auto-negotiation takes place, irrespective of the configuration of
the PHY.

Fixes: 10fbd71fc5f9b ("net: phy: realtek: implement configuring in-band an")
Signed-off-by: Jan Hoffmann <jan@....eu>
---
 drivers/net/phy/realtek/realtek_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c
index 5a7f472bf58e..7b7a48e5082a 100644
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
@@ -1429,6 +1429,7 @@ static unsigned int rtl822x_inband_caps(struct phy_device *phydev,
 {
 	switch (interface) {
 	case PHY_INTERFACE_MODE_2500BASEX:
+		return LINK_INBAND_DISABLE;
 	case PHY_INTERFACE_MODE_SGMII:
 		return LINK_INBAND_DISABLE | LINK_INBAND_ENABLE;
 	default:
-- 
2.52.0