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Subject[PATCH v2] net: sfp: Add tx-fault workaround for Huawei MA5671A SFP ONT
Date
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
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