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@armlinux.org.uk>
Tested-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/E1qnfXh-008UDe-F9@rmk-PC.armlinux.org.ukSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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.