As noted elsewhere, various GPON SFP modules exhibit non-standard
TX-fault behaviour. In the tested case, the Huawei MA5671A, when used
in combination with a Marvell mv88e6085 switch, was found to
persistently assert TX-fault, resulting in the module being disabled.

This patch adds a quirk to ignore the SFP_F_TX_FAULT state, allowing the
module to function.

Change from v1: removal of erroneous return statment (Andrew Lunn)

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
---
 drivers/net/phy/sfp.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 4dfb79807823..9a5d5a10560f 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -250,6 +250,7 @@ struct sfp {
 	struct sfp_eeprom_id id;
 	unsigned int module_power_mW;
 	unsigned int module_t_start_up;
+	bool tx_fault_ignore;
 
 #if IS_ENABLED(CONFIG_HWMON)
 	struct sfp_diag diag;
@@ -1956,6 +1957,12 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 	else
 		sfp->module_t_start_up = T_START_UP;
 
+	if (!memcmp(id.base.vendor_name, "HUAWEI          ", 16) &&
+	    !memcmp(id.base.vendor_pn, "MA5671A         ", 16))
+		sfp->tx_fault_ignore = true;
+	else
+		sfp->tx_fault_ignore = false;
+
 	return 0;
 }
 
@@ -2409,7 +2416,10 @@ static void sfp_check_state(struct sfp *sfp)
 	mutex_lock(&sfp->st_mutex);
 	state = sfp_get_state(sfp);
 	changed = state ^ sfp->state;
-	changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
+	if (sfp->tx_fault_ignore)
+		changed &= SFP_F_PRESENT | SFP_F_LOS;
+	else
+		changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
 
 	for (i = 0; i < GPIO_MAX; i++)
 		if (changed & BIT(i))
-- 
2.27.0

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon,  2 May 2022 23:33:15 +0100 you wrote:
> As noted elsewhere, various GPON SFP modules exhibit non-standard
> TX-fault behaviour. In the tested case, the Huawei MA5671A, when used
> in combination with a Marvell mv88e6085 switch, was found to
> persistently assert TX-fault, resulting in the module being disabled.
> 
> This patch adds a quirk to ignore the SFP_F_TX_FAULT state, allowing the
> module to function.
> 
> [...]

Here is the summary with links:
  - [v2] net: sfp: Add tx-fault workaround for Huawei MA5671A SFP ONT
    https://git.kernel.org/netdev/net/c/2069624dac19

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On Mon, May 02, 2022 at 11:33:15PM +0100, Matthew Hagan wrote:
> As noted elsewhere, various GPON SFP modules exhibit non-standard
> TX-fault behaviour. In the tested case, the Huawei MA5671A, when used
> in combination with a Marvell mv88e6085 switch, was found to
> persistently assert TX-fault, resulting in the module being disabled.
> 
> This patch adds a quirk to ignore the SFP_F_TX_FAULT state, allowing the
> module to function.
> 
> Change from v1: removal of erroneous return statment (Andrew Lunn)
> 
> Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew