From: Jan Hoffmann Date: Sun, 29 Mar 2026 19:11:11 +0000 (+0200) Subject: net: sfp: add quirk for ZOERAX SFP-2.5G-T X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=911e2c050963ccf239faec6ae9dee0f5e8f1cc5c;p=thirdparty%2Fkernel%2Flinux.git net: sfp: add quirk for ZOERAX SFP-2.5G-T This is a 2.5G copper module which appears to be based on a Motorcomm YT8821 PHY. There doesn't seem to be a usable way to to access the PHY (I2C address 0x56 provides only read-only C22 access, and Rollball is also not working). The module does not report the correct extended compliance code for 2.5GBase-T, and instead claims to support SONET OC-48 and Fibre Channel: Identifier : 0x03 (SFP) Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID) Connector : 0x07 (LC) Transceiver codes : 0x00 0x01 0x00 0x00 0x40 0x40 0x04 0x00 0x00 Transceiver type : FC: Multimode, 50um (M5) Encoding : 0x05 (SONET Scrambled) BR Nominal : 2500MBd Despite this, the kernel still enables the correct 2500Base-X interface mode. However, for the module to actually work, it is also necessary to disable inband auto-negotiation. Enable the existing "sfp_quirk_oem_2_5g" for this module, which handles that and also sets the bit for 2500Base-T link mode. Signed-off-by: Jan Hoffmann Reviewed-by: Russell King (Oracle) Link: https://patch.msgid.link/20260329191304.720160-1-jan@3e8.eu Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index 5db841377199..0a455a2daccb 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -567,6 +567,8 @@ static const struct sfp_quirk sfp_quirks[] = { SFP_QUIRK_F("Turris", "RTSFP-2.5G", sfp_fixup_rollball), SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball), SFP_QUIRK_F("Turris", "RTSFP-10G", sfp_fixup_rollball), + + SFP_QUIRK_S("ZOERAX", "SFP-2.5G-T", sfp_quirk_oem_2_5g), }; static size_t sfp_strlen(const char *str, size_t maxlen)