diff options
Diffstat (limited to 'target/linux/generic/backport-4.19/736-v5.5-net-sfp-allow-modules-with-slow-diagnostics-to-probe.patch')
| -rw-r--r-- | target/linux/generic/backport-4.19/736-v5.5-net-sfp-allow-modules-with-slow-diagnostics-to-probe.patch | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.19/736-v5.5-net-sfp-allow-modules-with-slow-diagnostics-to-probe.patch b/target/linux/generic/backport-4.19/736-v5.5-net-sfp-allow-modules-with-slow-diagnostics-to-probe.patch new file mode 100644 index 0000000000..fe1e6c4822 --- /dev/null +++ b/target/linux/generic/backport-4.19/736-v5.5-net-sfp-allow-modules-with-slow-diagnostics-to-probe.patch @@ -0,0 +1,198 @@ +From 559391fc20fae506adcb311b904cc544c76436c0 Mon Sep 17 00:00:00 2001 +From: Russell King <rmk+kernel@armlinux.org.uk> +Date: Thu, 7 Nov 2019 18:52:07 +0000 +Subject: [PATCH 634/660] net: sfp: allow modules with slow diagnostics to + probe + +When a module is inserted, we attempt to read read the ID from address +0x50. Once we are able to read the ID, we immediately attempt to +initialise the hwmon support by reading from address 0x51. If this +fails, then we fall into error state, and assume that the module is +not usable. + +Modules such as the ALCATELLUCENT 3FE46541AA use a real EEPROM for +I2C address 0x50, which responds immediately. However, address 0x51 +is an emulated, which only becomes available once the on-board firmware +has booted. This prompts us to fall into the error state. + +Since the module may be usable without diagnostics, arrange for the +hwmon probe independent of the rest of the SFP itself, retrying every +5s for up to about 60s for the monitoring to become available, and +print an error message if it doesn't become available. + +Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> +--- + drivers/net/phy/sfp.c | 96 +++++++++++++++++++++++++++++++++---------- + 1 file changed, 74 insertions(+), 22 deletions(-) + +--- a/drivers/net/phy/sfp.c ++++ b/drivers/net/phy/sfp.c +@@ -216,6 +216,8 @@ struct sfp { + + #if IS_ENABLED(CONFIG_HWMON) + struct sfp_diag diag; ++ struct delayed_work hwmon_probe; ++ unsigned int hwmon_tries; + struct device *hwmon_dev; + char *hwmon_name; + #endif +@@ -1094,29 +1096,27 @@ static const struct hwmon_chip_info sfp_ + .info = sfp_hwmon_info, + }; + +-static int sfp_hwmon_insert(struct sfp *sfp) ++static void sfp_hwmon_probe(struct work_struct *work) + { ++ struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work); + int err, i; + +- if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE) +- return 0; +- +- if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) +- return 0; +- +- if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) +- /* This driver in general does not support address +- * change. +- */ +- return 0; +- + err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag)); +- if (err < 0) +- return err; ++ if (err < 0) { ++ if (sfp->hwmon_tries--) { ++ mod_delayed_work(system_wq, &sfp->hwmon_probe, ++ T_PROBE_RETRY_SLOW); ++ } else { ++ dev_warn(sfp->dev, "hwmon probe failed: %d\n", err); ++ } ++ return; ++ } + + sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL); +- if (!sfp->hwmon_name) +- return -ENODEV; ++ if (!sfp->hwmon_name) { ++ dev_err(sfp->dev, "out of memory for hwmon name\n"); ++ return; ++ } + + for (i = 0; sfp->hwmon_name[i]; i++) + if (hwmon_is_bad_char(sfp->hwmon_name[i])) +@@ -1126,18 +1126,52 @@ static int sfp_hwmon_insert(struct sfp * + sfp->hwmon_name, sfp, + &sfp_hwmon_chip_info, + NULL); ++ if (IS_ERR(sfp->hwmon_dev)) ++ dev_err(sfp->dev, "failed to register hwmon device: %ld\n", ++ PTR_ERR(sfp->hwmon_dev)); ++} ++ ++static int sfp_hwmon_insert(struct sfp *sfp) ++{ ++ if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE) ++ return 0; ++ ++ if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) ++ return 0; ++ ++ if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) ++ /* This driver in general does not support address ++ * change. ++ */ ++ return 0; ++ ++ mod_delayed_work(system_wq, &sfp->hwmon_probe, 1); ++ sfp->hwmon_tries = R_PROBE_RETRY_SLOW; + +- return PTR_ERR_OR_ZERO(sfp->hwmon_dev); ++ return 0; + } + + static void sfp_hwmon_remove(struct sfp *sfp) + { ++ cancel_delayed_work_sync(&sfp->hwmon_probe); + if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) { + hwmon_device_unregister(sfp->hwmon_dev); + sfp->hwmon_dev = NULL; + kfree(sfp->hwmon_name); + } + } ++ ++static int sfp_hwmon_init(struct sfp *sfp) ++{ ++ INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe); ++ ++ return 0; ++} ++ ++static void sfp_hwmon_exit(struct sfp *sfp) ++{ ++ cancel_delayed_work_sync(&sfp->hwmon_probe); ++} + #else + static int sfp_hwmon_insert(struct sfp *sfp) + { +@@ -1147,6 +1181,15 @@ static int sfp_hwmon_insert(struct sfp * + static void sfp_hwmon_remove(struct sfp *sfp) + { + } ++ ++static int sfp_hwmon_init(struct sfp *sfp) ++{ ++ return 0; ++} ++ ++static void sfp_hwmon_exit(struct sfp *sfp) ++{ ++} + #endif + + /* Helpers */ +@@ -1483,10 +1526,6 @@ static int sfp_sm_mod_probe(struct sfp * + if (ret < 0) + return ret; + +- ret = sfp_hwmon_insert(sfp); +- if (ret < 0) +- return ret; +- + return 0; + } + +@@ -1635,6 +1674,15 @@ static void sfp_sm_module(struct sfp *sf + case SFP_MOD_ERROR: + break; + } ++ ++#if IS_ENABLED(CONFIG_HWMON) ++ if (sfp->sm_mod_state >= SFP_MOD_WAITDEV && ++ IS_ERR_OR_NULL(sfp->hwmon_dev)) { ++ err = sfp_hwmon_insert(sfp); ++ if (err) ++ dev_warn(sfp->dev, "hwmon probe failed: %d\n", err); ++ } ++#endif + } + + static void sfp_sm_main(struct sfp *sfp, unsigned int event) +@@ -1936,6 +1984,8 @@ static struct sfp *sfp_alloc(struct devi + INIT_DELAYED_WORK(&sfp->poll, sfp_poll); + INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout); + ++ sfp_hwmon_init(sfp); ++ + return sfp; + } + +@@ -1943,6 +1993,8 @@ static void sfp_cleanup(void *data) + { + struct sfp *sfp = data; + ++ sfp_hwmon_exit(sfp); ++ + cancel_delayed_work_sync(&sfp->poll); + cancel_delayed_work_sync(&sfp->timeout); + if (sfp->i2c_mii) { |