kernel: add quirk for Huawei-compatible OEM SFP GE-T

Ignore TX_FAULT signal on certain cheap copper/TP gigabit Ethernet SFP
modules.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/target/linux/generic/hack-5.15/790-SFP-GE-T-ignore-TX_FAULT.patch b/target/linux/generic/hack-5.15/790-SFP-GE-T-ignore-TX_FAULT.patch
new file mode 100644 (file)
index 0000000..bfb32d5
--- /dev/null
+++ b/target/linux/generic/hack-5.15/790-SFP-GE-T-ignore-TX_FAULT.patch
@@ -0,0 +1,47 @@
+--- a/drivers/net/phy/sfp.c
++++ b/drivers/net/phy/sfp.c
+@@ -1803,6 +1803,7 @@ static int sfp_sm_mod_probe(struct sfp *
+       struct sfp_eeprom_id id;
+       bool cotsworks_sfbg;
+       bool cotsworks;
++      bool oem_ge_t;
+       u8 check;
+       int ret;
+ 
+@@ -1851,6 +1852,10 @@ static int sfp_sm_mod_probe(struct sfp *
+               }
+       }
+ 
++      /* Some cheap SFP-GE-T modules always indicate TX fault */
++      oem_ge_t = !memcmp(id.base.vendor_name, "OEM             ", 16) &&
++                 !memcmp(id.base.vendor_pn, "SFP-GE-T    ", 12);
++
+       /* Cotsworks do not seem to update the checksums when they
+        * do the final programming with the final module part number,
+        * serial number and date code.
+@@ -1946,8 +1951,8 @@ 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))
++      if ((!memcmp(id.base.vendor_name, "HUAWEI          ", 16) &&
++          !memcmp(id.base.vendor_pn, "MA5671A         ", 16)) || oem_ge_t)
+               sfp->tx_fault_ignore = true;
+       else
+               sfp->tx_fault_ignore = false;
+@@ -2404,10 +2409,12 @@ static void sfp_check_state(struct sfp *
+       mutex_lock(&sfp->st_mutex);
+       state = sfp_get_state(sfp);
+       changed = state ^ sfp->state;
+-      if (sfp->tx_fault_ignore)
++      if (sfp->tx_fault_ignore) {
+               changed &= SFP_F_PRESENT | SFP_F_LOS;
+-      else
++              state &= ~SFP_F_TX_FAULT;
++      } else {
+               changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
++      }
+ 
+       for (i = 0; i < GPIO_MAX; i++)
+               if (changed & BIT(i))