After reset SGMII Autoneg timer is set to 2us (bits 6 and 5 are 01).
That us not enough to finalize autonegatiation on some devices.
Increase this timer duration to maximum supported 16ms.
Signed-off-by: Max Uvarov <muva...@gmail.com>
---
drivers/net/phy/dp83867.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index afd31c516cc7..66b0a09ad094 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -297,6 +297,19 @@ static int dp83867_config_init(struct phy_device *phydev)
WARN_ONCE(1, "dp83867: err DP83867_10M_SGMII_CFG\n");
return ret;
}
+
+ /* After reset SGMII Autoneg timer is set to 2us (bits 6 and 5
+ * are 01). That us not enough to finalize autoneg on some
+ * devices. Increase this timer duration to maximum 16ms.
+ */
+ val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4);
+ val &= ~(BIT(5) | BIT(6));
+ ret = phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val);
+ if (ret) {
+ WARN_ONCE(1, "dp83867: error config sgmii auto-neg
timer\n");
+ return ret;
+ }
+
}
/* Enable Interrupt output INT_OE in CFG3 register */
--
2.17.1
