linux-kernel - [PATCH AUTOSEL 6.2 14/17] net: sfp: add quirk enabling 2500Base-x for HG MXPD-483II

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Message-Id: <20230420110148.505779-14-sashal@kernel.org>
Date:   Thu, 20 Apr 2023 07:01:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Daniel Golle <daniel@...rotopia.org>, chowtom <chowtom@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, linux@...linux.org.uk,
        andrew@...n.ch, hkallweit1@...il.com, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.2 14/17] net: sfp: add quirk enabling 2500Base-x for HG MXPD-483II

From: Daniel Golle <daniel@...rotopia.org>

[ Upstream commit ad651d68cee75e9ac20002254c4e5d09ee67a84b ]

The HG MXPD-483II 1310nm SFP module is meant to operate with 2500Base-X,
however, in their EEPROM they incorrectly specify:
    Transceiver type                          : Ethernet: 1000BASE-LX
    ...
    BR, Nominal                               : 2600MBd

Use sfp_quirk_2500basex for this module to allow 2500Base-X mode anyway.

https://forum.banana-pi.org/t/bpi-r3-sfp-module-compatibility/14573/60

Reported-by: chowtom <chowtom@...il.com>
Tested-by: chowtom <chowtom@...il.com>
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/phy/sfp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 83b99d95b2787..10a5a6f4ec307 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -389,6 +389,10 @@ static const struct sfp_quirk sfp_quirks[] = {
 
 	SFP_QUIRK_F("HALNy", "HL-GSFP", sfp_fixup_halny_gsfp),
 
+	// HG MXPD-483II-F 2.5G supports 2500Base-X, but incorrectly reports
+	// 2600MBd in their EERPOM
+	SFP_QUIRK_M("HG GENUINE", "MXPD-483II", sfp_quirk_2500basex),
+
 	// Huawei MA5671A can operate at 2500base-X, but report 1.2GBd NRZ in
 	// their EEPROM
 	SFP_QUIRK("HUAWEI", "MA5671A", sfp_quirk_2500basex,
-- 
2.39.2