diff options
Diffstat (limited to 'target/linux/generic/pending-4.19/759-net-sfp-re-attempt-probing-for-phy.patch')
| -rw-r--r-- | target/linux/generic/pending-4.19/759-net-sfp-re-attempt-probing-for-phy.patch | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.19/759-net-sfp-re-attempt-probing-for-phy.patch b/target/linux/generic/pending-4.19/759-net-sfp-re-attempt-probing-for-phy.patch new file mode 100644 index 0000000000..526c7962cc --- /dev/null +++ b/target/linux/generic/pending-4.19/759-net-sfp-re-attempt-probing-for-phy.patch @@ -0,0 +1,132 @@ +From 6c4efe83a0acf6f06c89ae17b885fa5739eb5be7 Mon Sep 17 00:00:00 2001 +From: Russell King <rmk+kernel@armlinux.org.uk> +Date: Mon, 2 Dec 2019 18:20:22 +0000 +Subject: [PATCH 4/4] net: sfp: re-attempt probing for phy + +Some 1000BASE-T PHY modules take a while for the PHY to wake up. +Retry the probe a number of times before deciding that the module has +no PHY. + +Tested with: + Sourcephotonics SPGBTXCNFC - PHY takes less than 50ms to respond. + Champion One 1000SFPT - PHY takes about 200ms to respond. + Mikrotik S-RJ01 - no PHY + +Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> +--- + drivers/net/phy/sfp.c | 59 ++++++++++++++++++++++++++++++++++++--------------- + 1 file changed, 42 insertions(+), 17 deletions(-) + +--- a/drivers/net/phy/sfp.c ++++ b/drivers/net/phy/sfp.c +@@ -60,6 +60,7 @@ enum { + SFP_S_FAIL, + SFP_S_WAIT, + SFP_S_INIT, ++ SFP_S_INIT_PHY, + SFP_S_INIT_TX_FAULT, + SFP_S_WAIT_LOS, + SFP_S_LINK_UP, +@@ -124,6 +125,7 @@ static const char * const sm_state_strin + [SFP_S_FAIL] = "fail", + [SFP_S_WAIT] = "wait", + [SFP_S_INIT] = "init", ++ [SFP_S_INIT_PHY] = "init_phy", + [SFP_S_INIT_TX_FAULT] = "init_tx_fault", + [SFP_S_WAIT_LOS] = "wait_los", + [SFP_S_LINK_UP] = "link_up", +@@ -168,6 +170,12 @@ static const enum gpiod_flags gpio_flags + #define N_FAULT_INIT 5 + #define N_FAULT 5 + ++/* T_PHY_RETRY is the time interval between attempts to probe the PHY. ++ * R_PHY_RETRY is the number of attempts. ++ */ ++#define T_PHY_RETRY msecs_to_jiffies(50) ++#define R_PHY_RETRY 12 ++ + /* SFP module presence detection is poor: the three MOD DEF signals are + * the same length on the PCB, which means it's possible for MOD DEF 0 to + * connect before the I2C bus on MOD DEF 1/2. +@@ -223,6 +231,7 @@ struct sfp { + unsigned char sm_dev_state; + unsigned short sm_state; + unsigned char sm_fault_retries; ++ unsigned char sm_phy_retries; + + struct sfp_eeprom_id id; + unsigned int module_power_mW; +@@ -1340,10 +1349,8 @@ static int sfp_sm_probe_phy(struct sfp * + int err; + + phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45); +- if (phy == ERR_PTR(-ENODEV)) { +- dev_info(sfp->dev, "no PHY detected\n"); +- return 0; +- } ++ if (phy == ERR_PTR(-ENODEV)) ++ return PTR_ERR(phy); + if (IS_ERR(phy)) { + dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy)); + return PTR_ERR(phy); +@@ -1785,6 +1792,7 @@ static void sfp_sm_module(struct sfp *sf + static void sfp_sm_main(struct sfp *sfp, unsigned int event) + { + unsigned long timeout; ++ int ret; + + /* Some events are global */ + if (sfp->sm_state != SFP_S_DOWN && +@@ -1857,22 +1865,39 @@ static void sfp_sm_main(struct sfp *sfp, + sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT, + sfp->sm_fault_retries == N_FAULT_INIT); + } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { +- init_done: /* TX_FAULT deasserted or we timed out with TX_FAULT +- * clear. Probe for the PHY and check the LOS state. +- */ +- if (sfp_sm_probe_for_phy(sfp)) { +- sfp_sm_next(sfp, SFP_S_FAIL, 0); +- break; +- } +- if (sfp_module_start(sfp->sfp_bus)) { +- sfp_sm_next(sfp, SFP_S_FAIL, 0); ++ init_done: ++ sfp->sm_phy_retries = R_PHY_RETRY; ++ goto phy_probe; ++ } ++ break; ++ ++ case SFP_S_INIT_PHY: ++ if (event != SFP_E_TIMEOUT) ++ break; ++ phy_probe: ++ /* TX_FAULT deasserted or we timed out with TX_FAULT ++ * clear. Probe for the PHY and check the LOS state. ++ */ ++ ret = sfp_sm_probe_for_phy(sfp); ++ if (ret == -ENODEV) { ++ if (--sfp->sm_phy_retries) { ++ sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY); + break; ++ } else { ++ dev_info(sfp->dev, "no PHY detected\n"); + } +- sfp_sm_link_check_los(sfp); +- +- /* Reset the fault retry count */ +- sfp->sm_fault_retries = N_FAULT; ++ } else if (ret) { ++ sfp_sm_next(sfp, SFP_S_FAIL, 0); ++ break; + } ++ if (sfp_module_start(sfp->sfp_bus)) { ++ sfp_sm_next(sfp, SFP_S_FAIL, 0); ++ break; ++ } ++ sfp_sm_link_check_los(sfp); ++ ++ /* Reset the fault retry count */ ++ sfp->sm_fault_retries = N_FAULT; + break; + + case SFP_S_INIT_TX_FAULT: |