[PATCH v2 2/4] net: phy: dp83867: increase SGMII autoneg timer duration

[Max Uvarov <muvarov@gmail.com>]

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 <muvarov@gmail.com>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/dp83867.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 75861b8f3b4d..5fafcc091525 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -295,6 +295,16 @@ static int dp83867_config_init(struct phy_device *phydev)
 				    DP83867_10M_SGMII_CFG, val);
 		if (ret)
 			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)
+			return ret;
 	}
 
 	/* Enable Interrupt output INT_OE in CFG3 register */
-- 
2.17.1