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From 4d6bfb6fbb00af38402db4d1ce464e22def9fd9e Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Thu, 28 Nov 2019 14:24:40 +0000
Subject: [PATCH 1/4] net: sfp: use a definition for the fault recovery
attempts
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
drivers/net/phy/sfp.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -170,6 +170,14 @@ static const enum gpiod_flags gpio_flags
#define T_RESET_US 10
#define T_FAULT_RECOVER msecs_to_jiffies(1000)
+/* N_FAULT_INIT is the number of recovery attempts at module initialisation
+ * time. If the TX_FAULT signal is not deasserted after this number of
+ * attempts at clearing it, we decide that the module is faulty.
+ * N_FAULT is the same but after the module has initialised.
+ */
+#define N_FAULT_INIT 5
+#define N_FAULT 5
+
/* 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.
@@ -1820,7 +1828,7 @@ static void sfp_sm_main(struct sfp *sfp,
sfp_module_tx_enable(sfp);
/* Initialise the fault clearance retries */
- sfp->sm_retries = 5;
+ sfp->sm_retries = N_FAULT_INIT;
/* We need to check the TX_FAULT state, which is not defined
* while TX_DISABLE is asserted. The earliest we want to do
@@ -1860,7 +1868,7 @@ static void sfp_sm_main(struct sfp *sfp,
* or t_start_up, so assume there is a fault.
*/
sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
- sfp->sm_retries == 5);
+ sfp->sm_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.
@@ -1873,7 +1881,7 @@ static void sfp_sm_main(struct sfp *sfp,
sfp_sm_link_check_los(sfp);
/* Reset the fault retry count */
- sfp->sm_retries = 5;
+ sfp->sm_retries = N_FAULT;
}
break;
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