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net: sfp: Add tx-fault workaround for Huawei MA5671A SFP ONT 

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>
Link: https://lore.kernel.org/r/20220502223315.1973376-1-mnhagan88@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthew Hagan 2022-05-02 23:33:15 +01:00 committed by Jakub Kicinski
parent 3a58f13a88
commit 2069624dac
1 changed files with 11 additions and 1 deletions
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10
drivers/net/phy/sfp.c
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@ -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;
}
@ -2409,6 +2416,9 @@ 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;
for (i = 0; i < GPIO_MAX; i++)