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realtek: RTL931x: disable USXGMII SerDes setup
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The first RTL931x devices make their way into OpenWrt. Their copper
ports are driven by different interfaces modes like 10G_QXGMII or
Realtek proprietary XSGMII. The DSA driver has no proper handling
for theses modes implemented yet. So a lot is auto-mapped to USXGMII
internally. As soon as the SerDes setup activates this (wrong) mode
the PHY connectivity breaks.

Disable this mode for now and rely on the proper U-Boot setup.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/20292
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Markus Stockhausen 2025-10-03 11:18:42 -04:00 • committed by Robert Marko
parent 8916b26a66
commit c18476d0c5
1 changed files with 10 additions and 4 deletions
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14
target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c
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@ -692,10 +692,16 @@ static void rtl931x_phylink_mac_config(struct dsa_switch *ds, int port,
rtl931x_sds_init(sds_num, PHY_INTERFACE_MODE_10GBASER);
break;
case PHY_INTERFACE_MODE_USXGMII:
/* Translates to MII_USXGMII_10GSXGMII */
band = rtl931x_sds_cmu_band_get(sds_num, PHY_INTERFACE_MODE_USXGMII);
rtl931x_sds_init(sds_num, PHY_INTERFACE_MODE_USXGMII);
break;
/*
* TODO: USXGMII is currently the swiss army knife to declare 10G
* multi port PHYs. Real devices use other modes instead. Especially
*
* - RTL8224 is driven in 10G_QXGMII
* - RTL8218D/E are driven in (Realtek proprietary) XSGMII (10G SGMII)
*
* For now disable all USXGMII SerDes handling and rely on U-Boot setup.
*/
break;
case PHY_INTERFACE_MODE_SGMII:
pr_info("%s setting mode PHY_INTERFACE_MODE_SGMII\n", __func__);
band = rtl931x_sds_cmu_band_get(sds_num, PHY_INTERFACE_MODE_SGMII);