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From 28baa5e2635285b178326b301f534ed95c65dd01 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Thu, 29 Sep 2016 11:44:39 +0200
Subject: [PATCH] sfp: retry phy probe if unsuccessful
Some phys seem to take longer than 50 ms to come out of reset, so retry
until we find a phy.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
drivers/net/phy/sfp.c | 38 +++++++++++++++++++++++++-------------
1 file changed, 25 insertions(+), 13 deletions(-)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -488,7 +488,7 @@ static void sfp_sm_phy_detach(struct sfp
sfp->mod_phy = NULL;
}
-static void sfp_sm_probe_phy(struct sfp *sfp)
+static int sfp_sm_probe_phy(struct sfp *sfp)
{
struct phy_device *phy;
int err;
@@ -498,11 +498,11 @@ static void sfp_sm_probe_phy(struct sfp
phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
if (phy == ERR_PTR(-ENODEV)) {
dev_info(sfp->dev, "no PHY detected\n");
- return;
+ return -EAGAIN;
}
if (IS_ERR(phy)) {
dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
- return;
+ return PTR_ERR(phy);
}
err = sfp_add_phy(sfp->sfp_bus, phy);
@@ -510,11 +510,13 @@ static void sfp_sm_probe_phy(struct sfp
phy_device_remove(phy);
phy_device_free(phy);
dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
- return;
+ return err;
}
sfp->mod_phy = phy;
phy_start(phy);
+
+ return 0;
}
static void sfp_sm_link_up(struct sfp *sfp)
@@ -560,14 +562,9 @@ static void sfp_sm_fault(struct sfp *sfp
static void sfp_sm_mod_init(struct sfp *sfp)
{
- sfp_module_tx_enable(sfp);
+ int ret = 0;
- /* Wait t_init before indicating that the link is up, provided the
- * current state indicates no TX_FAULT. If TX_FAULT clears before
- * this time, that's fine too.
- */
- sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
- sfp->sm_retries = 5;
+ sfp_module_tx_enable(sfp);
/* Setting the serdes link mode is guesswork: there's no
* field in the EEPROM which indicates what mode should
@@ -581,7 +578,22 @@ static void sfp_sm_mod_init(struct sfp *
if (sfp->id.base.e1000_base_t ||
sfp->id.base.e100_base_lx ||
sfp->id.base.e100_base_fx)
- sfp_sm_probe_phy(sfp);
+ ret = sfp_sm_probe_phy(sfp);
+
+ if (!ret) {
+ /* Wait t_init before indicating that the link is up, provided
+ * the current state indicates no TX_FAULT. If TX_FAULT clears
+ * this time, that's fine too.
+ */
+ sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
+ sfp->sm_retries = 5;
+ return;
+ }
+
+ if (ret == -EAGAIN)
+ sfp_sm_set_timer(sfp, T_PROBE_RETRY);
+ else
+ sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
}
static int sfp_sm_mod_probe(struct sfp *sfp)
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