netdev - [PATCH net-next 2/2] net: sfp: improve Nokia GPON sfp fixup

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Date: Tue, 03 Oct 2023 14:34:29 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 2/2] net: sfp: improve Nokia GPON sfp fixup

Improve the Nokia GPON fixup - we need to ignore not only the hardware
LOS signal, but also the software implementation as well. Do this by
using the new state_ignore_mask to indicate that we should ignore not
only the hardware RX_LOS signal, and also clear the LOS bits in the
option field.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/sfp.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 1f32e936d3ab..1016a953226b 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -345,11 +345,26 @@ static void sfp_fixup_long_startup(struct sfp *sfp)
 	sfp->module_t_start_up = T_START_UP_BAD_GPON;
 }
 
+static void sfp_fixup_ignore_los(struct sfp *sfp)
+{
+	/* This forces LOS to zero, so we ignore transitions */
+	sfp->state_ignore_mask |= SFP_F_LOS;
+	/* Make sure that LOS options are clear */
+	sfp->id.ext.options &= ~cpu_to_be16(SFP_OPTIONS_LOS_INVERTED |
+					    SFP_OPTIONS_LOS_NORMAL);
+}
+
 static void sfp_fixup_ignore_tx_fault(struct sfp *sfp)
 {
 	sfp->state_ignore_mask |= SFP_F_TX_FAULT;
 }
 
+static void sfp_fixup_nokia(struct sfp *sfp)
+{
+	sfp_fixup_long_startup(sfp);
+	sfp_fixup_ignore_los(sfp);
+}
+
 // For 10GBASE-T short-reach modules
 static void sfp_fixup_10gbaset_30m(struct sfp *sfp)
 {
@@ -446,7 +461,7 @@ static const struct sfp_quirk sfp_quirks[] = {
 	// Alcatel Lucent G-010S-A can operate at 2500base-X, but report 3.2GBd
 	// NRZ in their EEPROM
 	SFP_QUIRK("ALCATELLUCENT", "3FE46541AA", sfp_quirk_2500basex,
-		  sfp_fixup_long_startup),
+		  sfp_fixup_nokia),
 
 	// Fiberstore SFP-10G-T doesn't identify as copper, and uses the
 	// Rollball protocol to talk to the PHY.
-- 
2.30.2