[openwrt/openwrt] kernel: fix rtl8261n driver for realtek

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/b77fa45d1278443d534919598c0301719fed2784

commit b77fa45d1278443d534919598c0301719fed2784
Author: Andrew LaMarche <andrewjlamarche at gmail.com>
AuthorDate: Mon Jun 9 18:49:28 2025 +0000

    kernel: fix rtl8261n driver for realtek
    
    The RTL8261N driver does not work correctly on non-mediatek devices. Remove
    some of the power controls for Realtek chips.
    
    This assumes the network has been started by the bootloader already:
    (rtk network on).
    
    Co-authored-by: Sebastian Gottschall
    - https://github.com/mirror/dd-wrt/commit/bf45143f03d40bf259d34bba2151aab46ee011f4
    - https://github.com/mirror/dd-wrt/commit/2fb02a5745bb538124a7467b399930b5ca79e71d
    - https://github.com/mirror/dd-wrt/commit/598a16a8d801869e09c033f8ca35534289d393cf
    Signed-off-by: Andrew LaMarche <andrewjlamarche at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/19081
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 .../generic/files/drivers/net/phy/rtl8261n/phy_patch.c  | 17 +++++++++++++----
 .../generic/files/drivers/net/phy/rtl8261n/rtk_phy.c    | 10 +++++++++-
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/target/linux/generic/files/drivers/net/phy/rtl8261n/phy_patch.c b/target/linux/generic/files/drivers/net/phy/rtl8261n/phy_patch.c
index f9af3ffe02..7563f67053 100644
--- a/target/linux/generic/files/drivers/net/phy/rtl8261n/phy_patch.c
+++ b/target/linux/generic/files/drivers/net/phy/rtl8261n/phy_patch.c
@@ -98,6 +98,11 @@ static int32 _phy_patch_process(uint32 unit, rtk_port_t port, uint8 portOffset,
     return (chk_ret == RT_ERR_CHECK_FAILED) ? chk_ret : RT_ERR_OK;
 }
 
+rtk_hwpatch_t rtl826XB_patch_rtk_conf[] = {
+    {RTK_PATCH_OP_PSDS0   , 0xff , 0x07  , 0x10  , 15, 0, 0x80aa, RTK_PATCH_CMP_WC  , 0, 0, 0, 0},
+    {RTK_PATCH_OP_PSDS0   , 0xff , 0x06  , 0x12  , 15, 0, 0x5078, RTK_PATCH_CMP_WC  , 0, 0, 0, 0},
+};
+
 /* Function Name:
  *      phy_patch
  * Description:
@@ -170,10 +175,14 @@ int32 phy_patch(uint32 unit, rtk_port_t port, uint8 portOffset, uint8 patch_mode
             break;
         }
     }
+    ret = _phy_patch_process(unit, port, portOffset, rtl826XB_patch_rtk_conf, sizeof(rtl826XB_patch_rtk_conf), patch_mode);
+    if (ret == RT_ERR_CHECK_FAILED)
+        chk_ret = ret;
+    else if (ret  != RT_ERR_OK)
+    {
+        RT_LOG(LOG_MAJOR_ERR, (MOD_HAL | MOD_PHY), "U%u P%u patch_mode:%u id:%u patch-%u failed. ret:0x%X\n", unit, port, patch_mode, i, patch_type, ret);
+        return ret;
+    }
 
     return (chk_ret == RT_ERR_CHECK_FAILED) ? chk_ret : RT_ERR_OK;
 }
-
-
-
-
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 23e1d8c4ec..23916a89ef 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
@@ -69,7 +69,9 @@ static int rtkphy_config_init(struct phy_device *phydev)
         case REALTEK_PHY_ID_RTL8264B:
         case REALTEK_PHY_ID_RTL8264:
             phydev_info(phydev, "%s:%u [RTL8261N/RTL8264/RTL826XB] phy_id: 0x%X PHYAD:%d\n", __FUNCTION__, __LINE__, phydev->drv->phy_id, phydev->mdio.addr);
-
+#ifdef CONFIG_MACH_REALTEK_RTL
+            return 0;
+#endif
 
           #if 1 /* toggle reset */
             phy_modify_mmd_changed(phydev, 30, 0x145, BIT(0)  , 1);
@@ -128,7 +130,9 @@ static int rtkphy_c45_suspend(struct phy_device *phydev)
 {
     int ret = 0;
 
+#ifndef CONFIG_MACH_REALTEK_RTL
     ret = rtk_phylib_c45_power_low(phydev);
+#endif
 
     phydev->speed = SPEED_UNKNOWN;
     phydev->duplex = DUPLEX_UNKNOWN;
@@ -140,7 +144,11 @@ static int rtkphy_c45_suspend(struct phy_device *phydev)
 
 static int rtkphy_c45_resume(struct phy_device *phydev)
 {
+#ifndef CONFIG_MACH_REALTEK_RTL
     return rtk_phylib_c45_power_normal(phydev);
+#else
+    return 0;
+#endif
 }
 
 static int rtkphy_c45_config_aneg(struct phy_device *phydev)