linux-kernel - [PATCH net-next] net: sfp: add quirk for 2.5G OEM BX SFP

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Message-Id: <20250218-b4-lkmsub-v1-1-1e51dcabed90@birger-koblitz.de>
Date: Tue, 18 Feb 2025 18:59:40 +0100
From: Birger Koblitz <mail@...ger-koblitz.de>
To: Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>, 
 Heiner Kallweit <hkallweit1@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Birger Koblitz <mail@...ger-koblitz.de>, 
 Daniel Golle <daniel@...rotopia.org>
Subject: [PATCH net-next] net: sfp: add quirk for 2.5G OEM BX SFP

The OEM SFP-2.5G-BX10-D/U SFP module pair is meant to operate with
2500Base-X. However, in their EEPROM they incorrectly specify:
Transceiver codes   : 0x00 0x12 0x00 0x00 0x12 0x00 0x01 0x05 0x00
BR, Nominal         : 2500MBd

Use sfp_quirk_2500basex for this module to allow 2500Base-X mode anyway.
Tested on BananaPi R3.

Signed-off-by: Birger Koblitz <mail@...ger-koblitz.de>
Reviewed-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/phy/sfp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 7dbcbf0a4ee26a221e9c47a6f030c8a18317bdbb..9369f5297769493efcab0ed4c356245baa1aa248 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -515,6 +515,8 @@ static const struct sfp_quirk sfp_quirks[] = {

 	SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc),
 	SFP_QUIRK_M("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
+	SFP_QUIRK_M("OEM", "SFP-2.5G-BX10-D", sfp_quirk_2500basex),
+	SFP_QUIRK_M("OEM", "SFP-2.5G-BX10-U", sfp_quirk_2500basex),
 	SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
 	SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc),
 	SFP_QUIRK_F("Turris", "RTSFP-2.5G", sfp_fixup_rollball),

---
base-commit: f80d71e9c515163dd337d3b22b6915b1bd7b478d
change-id: 20250218-b4-lkmsub-fab17f71f9c6

Best regards,
-- 
Birger Koblitz <mail@...ger-koblitz.de>