From: Richard Huynh <voxlympha@gmail.com>
Date: Sun, 19 Oct 2025 10:52:59 +0000 (+1100)
Subject: kernel: rtl8261n: Add support for Serdes RX swap
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=refs%2Fpull%2F20465%2Fhead;p=thirdparty%2Fopenwrt.git

kernel: rtl8261n: Add support for Serdes RX swap

Datasheet claims this register bit is supposed to be set by default,
however it was found in practice to not be, and OEM drivers would set
this bit at the same time.

Signed-off-by: Richard Huynh <voxlympha@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20465
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---

diff --git a/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phy.c b/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phy.c
index faa057f0297..a1eb2c16149 100644
--- a/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phy.c
+++ b/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phy.c
@@ -61,6 +61,7 @@ static int rtl826xb_probe(struct phy_device *phydev)
 
     priv->phytype = (phydev->drv->phy_id == REALTEK_PHY_ID_RTL8261N) ? (RTK_PHYLIB_RTL8261N) : (RTK_PHYLIB_RTL8264B);
     priv->isBasePort = (phydev->drv->phy_id == REALTEK_PHY_ID_RTL8261N) ? (1) : (((phydev->mdio.addr % 4) == 0) ? (1) : (0));
+    priv->pnswap_rx = device_property_read_bool(dev, "realtek,pnswap-rx");
     priv->pnswap_tx = device_property_read_bool(dev, "realtek,pnswap-tx");
     phydev->priv = priv;
 
@@ -125,6 +126,11 @@ static int rtkphy_config_init(struct phy_device *phydev)
             }
           #endif
 
+            if (priv->pnswap_rx)
+                phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+                                 REALTEK_SERDES_GLOBAL_CFG,
+                                 REALTEK_HSI_INV);
+
             if (priv->pnswap_tx)
                 phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
                                  REALTEK_SERDES_GLOBAL_CFG,
diff --git a/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phylib.h b/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phylib.h
index c94e9cb9661..c1253b1ec97 100644
--- a/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phylib.h
+++ b/target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phylib.h
@@ -51,6 +51,7 @@ struct rtk_phy_priv {
     uint8 isBasePort;
     rt_phy_patch_db_t *patch;
 
+    bool pnswap_rx;
     bool pnswap_tx;
 };