netdev - [PATCH] net: sfp: add quirk for Potron SFP+ XGSPON ONU Stick

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Message-ID: <20250605221730.398665-1-macroalpha82@gmail.com>
Date: Thu,  5 Jun 2025 17:17:30 -0500
From: Chris Morgan <macroalpha82@...il.com>
To: netdev@...r.kernel.org
Cc: linux@...linux.org.uk,
	andrew@...n.ch,
	hkallweit1@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	Chris Morgan <macromorgan@...mail.com>
Subject: [PATCH] net: sfp: add quirk for Potron SFP+ XGSPON ONU Stick

From: Chris Morgan <macromorgan@...mail.com>

Add quirk for Potron SFP+ XGSPON ONU Stick (YV SFP+ONT-XGSPON).

This device uses pins 2 and 7 for UART communication, so disable
TX_FAULT and LOS. Additionally as it is an embedded system in an
SFP+ form factor provide it enough time to fully boot before we
attempt to use it.

https://www.potrontec.com/index/index/list/cat_id/2.html#11-83
https://pon.wiki/xgs-pon/ont/potron-technology/x-onu-sfpp/

Signed-off-by: Chris Morgan <macromorgan@...mail.com>
---
 drivers/net/phy/sfp.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 347c1e0e94d9..b15eb60a0382 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -412,6 +412,18 @@ static void sfp_fixup_halny_gsfp(struct sfp *sfp)
 	sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
 }
 
+static void sfp_fixup_potron(struct sfp *sfp)
+{
+	/*
+	 * The TX_FAULT and LOS pins on this device are used for serial
+	 * communication, so ignore them. Additionally, provide extra
+	 * time for this device to fully start up.
+	 */
+
+	sfp_fixup_long_startup(sfp);
+	sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
+}
+
 static void sfp_fixup_rollball_cc(struct sfp *sfp)
 {
 	sfp_fixup_rollball(sfp);
@@ -512,6 +524,8 @@ static const struct sfp_quirk sfp_quirks[] = {
 	SFP_QUIRK_F("Walsun", "HXSX-ATRC-1", sfp_fixup_fs_10gt),
 	SFP_QUIRK_F("Walsun", "HXSX-ATRI-1", sfp_fixup_fs_10gt),
 
+	SFP_QUIRK_F("YV", "SFP+ONU-XGSPON", sfp_fixup_potron),
+
 	// OEM SFP-GE-T is a 1000Base-T module with broken TX_FAULT indicator
 	SFP_QUIRK_F("OEM", "SFP-GE-T", sfp_fixup_ignore_tx_fault),
 
-- 
2.43.0