net: sfp: re-implement ignoring the hardware TX_FAULT signal

Re-implement how we ignore the hardware TX_FAULT signal. Rather than
having a separate boolean for this, use a bitmask of the hardware
signals that we wish to ignore. This gives more flexibility in the
future to ignore other signals such as RX_LOS.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/E1qnfXc-008UDY-91@rmk-PC.armlinux.org.ukSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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;
 
@@ -347,7 +347,7 @@ static void sfp_fixup_long_startup(struct sfp *sfp)
 
 static void sfp_fixup_ignore_tx_fault(struct sfp *sfp)
 {
-	sfp->tx_fault_ignore = true;
+	sfp->state_ignore_mask |= SFP_F_TX_FAULT;
 }
 
 // For 10GBASE-T short-reach modules
@@ -792,7 +792,8 @@ 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 +2318,7 @@ 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 +2341,8 @@ 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 +2844,7 @@ 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))