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kernel: backports: add Huawei MA5671A tx-fault workaround

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This workaround will allow the MA5671A to function, ignoring the
persistently asserted tx-fault.

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
(added 5.15 backport)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Matthew Hagan 2022-05-04 08:26:44 +01:00 committed by Christian Lamparter
parent b2c9c4dda2
commit d9fae43202
2 changed files with 114 additions and 0 deletions
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57
target/linux/generic/backport-5.10/890-v5.19-net-sfp-Add-tx-fault-workaround-for-Huawei-MA5671A-SFP-ON.patch Normal file
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@ -0,0 +1,57 @@
From f81d97cb646ab8b90fb181d66fccaf9589990de6 Mon Sep 17 00:00:00 2001
From: Matthew Hagan <mnhagan88@gmail.com>
Date: Sat, 30 Apr 2022 11:00:49 +0100
Subject: [PATCH v2] 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>
---
drivers/net/phy/sfp.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -249,6 +249,7 @@ 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;
@@ -1893,6 +1894,12 @@ static int sfp_sm_mod_probe(struct sfp *
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;
}
@@ -2320,7 +2327,10 @@ static void sfp_check_state(struct 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))

57
target/linux/generic/backport-5.15/890-v5.19-net-sfp-Add-tx-fault-workaround-for-Huawei-MA5671A-SFP-ON.patch Normal file
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@ -0,0 +1,57 @@
From f81d97cb646ab8b90fb181d66fccaf9589990de6 Mon Sep 17 00:00:00 2001
From: Matthew Hagan <mnhagan88@gmail.com>
Date: Sat, 30 Apr 2022 11:00:49 +0100
Subject: [PATCH v2] 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>
---
drivers/net/phy/sfp.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- 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;
@@ -1945,6 +1946,12 @@ static int sfp_sm_mod_probe(struct sfp *
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;
}
@@ -2397,7 +2404,10 @@ static void sfp_check_state(struct 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))