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109 lines
3.7 KiB
Diff
109 lines
3.7 KiB
Diff
From 283b211aa01bdae94dffb3121655dbb20bf237f4 Mon Sep 17 00:00:00 2001
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From: Russell King <rmk+kernel@armlinux.org.uk>
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Date: Tue, 3 Dec 2019 15:22:05 +0000
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Subject: net: sfp: avoid tx-fault with Nokia GPON module
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The Nokia GPON module can hold tx-fault active while it is initialising
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which can take up to 60s. Avoid this causing the module to be declared
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faulty after the SFP MSA defined non-cooled module timeout.
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Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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---
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drivers/net/phy/sfp.c | 42 ++++++++++++++++++++++++++++++------------
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1 file changed, 30 insertions(+), 12 deletions(-)
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--- a/drivers/net/phy/sfp.c
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+++ b/drivers/net/phy/sfp.c
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@@ -153,10 +153,20 @@ static const enum gpiod_flags gpio_flags
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GPIOD_ASIS,
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};
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-#define T_WAIT msecs_to_jiffies(50)
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-#define T_INIT_JIFFIES msecs_to_jiffies(300)
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-#define T_RESET_US 10
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-#define T_FAULT_RECOVER msecs_to_jiffies(1000)
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+/* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a
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+ * non-cooled module to initialise its laser safety circuitry. We wait
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+ * an initial T_WAIT period before we check the tx fault to give any PHY
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+ * on board (for a copper SFP) time to initialise.
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+ */
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+#define T_WAIT msecs_to_jiffies(50)
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+#define T_START_UP msecs_to_jiffies(300)
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+#define T_START_UP_BAD_GPON msecs_to_jiffies(60000)
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+
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+/* t_reset is the time required to assert the TX_DISABLE signal to reset
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+ * an indicated TX_FAULT.
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+ */
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+#define T_RESET_US 10
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+#define T_FAULT_RECOVER msecs_to_jiffies(1000)
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/* SFP module presence detection is poor: the three MOD DEF signals are
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* the same length on the PCB, which means it's possible for MOD DEF 0 to
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@@ -216,6 +226,7 @@ struct sfp {
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struct sfp_eeprom_id id;
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unsigned int module_power_mW;
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+ unsigned int module_t_start_up;
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#if IS_ENABLED(CONFIG_HWMON)
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struct sfp_diag diag;
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@@ -1590,6 +1601,12 @@ static int sfp_sm_mod_probe(struct sfp *
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if (ret < 0)
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return ret;
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+ if (!memcmp(id.base.vendor_name, "ALCATELLUCENT ", 16) &&
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+ !memcmp(id.base.vendor_pn, "3FE46541AA ", 16))
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+ sfp->module_t_start_up = T_START_UP_BAD_GPON;
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+ else
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+ sfp->module_t_start_up = T_START_UP;
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+
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return 0;
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}
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@@ -1795,11 +1812,12 @@ static void sfp_sm_main(struct sfp *sfp,
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break;
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if (sfp->state & SFP_F_TX_FAULT) {
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- /* Wait t_init before indicating that the link is up,
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- * provided the current state indicates no TX_FAULT. If
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- * TX_FAULT clears before this time, that's fine too.
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+ /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
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+ * from the TX_DISABLE deassertion for the module to
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+ * initialise, which is indicated by TX_FAULT
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+ * deasserting.
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*/
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- timeout = T_INIT_JIFFIES;
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+ timeout = sfp->module_t_start_up;
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if (timeout > T_WAIT)
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timeout -= T_WAIT;
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else
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@@ -1816,8 +1834,8 @@ static void sfp_sm_main(struct sfp *sfp,
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case SFP_S_INIT:
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if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
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- /* TX_FAULT is still asserted after t_init, so assume
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- * there is a fault.
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+ /* TX_FAULT is still asserted after t_init or
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+ * or t_start_up, so assume there is a fault.
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*/
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sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
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sfp->sm_retries == 5);
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@@ -1836,7 +1854,7 @@ static void sfp_sm_main(struct sfp *sfp,
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case SFP_S_INIT_TX_FAULT:
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if (event == SFP_E_TIMEOUT) {
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sfp_module_tx_fault_reset(sfp);
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- sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
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+ sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
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}
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break;
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@@ -1860,7 +1878,7 @@ static void sfp_sm_main(struct sfp *sfp,
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case SFP_S_TX_FAULT:
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if (event == SFP_E_TIMEOUT) {
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sfp_module_tx_fault_reset(sfp);
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- sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
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+ sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up);
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}
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break;
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