Merge branch 'rework-tx-fault-fixups'

Russell King says:

====================
Rework tx fault fixups

This series reworks the tx-fault fixup and then improves the Nokia GPON
workaround to also ignore the RX LOS signal as well. We do this by
introducing a mask of hardware pin states that should be ignored,
converting the tx-fault fixup to use that, and then augmenting it for
RX LOS.
====================

Link: https://lore.kernel.org/r/ZRwYJXRizvkhm83M@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 24 insertions, 9 deletions

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 3679a43f4eb024..b8c0961daf5317 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -257,6 +257,7 @@ struct sfp {
 	unsigned int state_hw_drive;
 	unsigned int state_hw_mask;
 	unsigned int state_soft_mask;
+	unsigned int state_ignore_mask;
 	unsigned int state;
 
 	struct delayed_work poll;
@@ -280,7 +281,6 @@ struct sfp {
 	unsigned int rs_state_mask;
 
 	bool have_a2;
-	bool tx_fault_ignore;
 
 	const struct sfp_quirk *quirk;
 
@@ -345,9 +345,24 @@ 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->tx_fault_ignore = true;
+	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
@@ -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.
@@ -792,7 +807,8 @@ static void sfp_soft_start_poll(struct sfp *sfp)
 
 	mutex_lock(&sfp->st_mutex);
 	// Poll the soft state for hardware pins we want to ignore
-	sfp->state_soft_mask = ~sfp->state_hw_mask & mask;
+	sfp->state_soft_mask = ~sfp->state_hw_mask & ~sfp->state_ignore_mask &
+			       mask;
 
 	if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
 	    !sfp->need_poll)
@@ -2317,7 +2333,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 	sfp->module_t_start_up = T_START_UP;
 	sfp->module_t_wait = T_WAIT;
 
-	sfp->tx_fault_ignore = false;
+	sfp->state_ignore_mask = 0;
 
 	if (sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SFI ||
 	    sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SR ||
@@ -2340,6 +2356,8 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 
 	if (sfp->quirk && sfp->quirk->fixup)
 		sfp->quirk->fixup(sfp);
+
+	sfp->state_hw_mask &= ~sfp->state_ignore_mask;
 	mutex_unlock(&sfp->st_mutex);
 
 	return 0;
@@ -2841,10 +2859,7 @@ static void sfp_check_state(struct sfp *sfp)
 	mutex_lock(&sfp->st_mutex);
 	state = sfp_get_state(sfp);
 	changed = state ^ sfp->state;
-	if (sfp->tx_fault_ignore)
-		changed &= SFP_F_PRESENT | SFP_F_LOS;
-	else
-		changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
+	changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
 
 	for (i = 0; i < GPIO_MAX; i++)
 		if (changed & BIT(i))