linux-kernel - [PATCH 5.1 86/98] net: phy: dp83867: increase SGMII autoneg timer duration

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Date:   Thu, 20 Jun 2019 19:57:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Max Uvarov <muvarov@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 86/98] net: phy: dp83867: increase SGMII autoneg timer duration

[ Upstream commit 1a97a477e666cbdededab93bd3754e508f0c09d7 ]

After reset SGMII Autoneg timer is set to 2us (bits 6 and 5 are 01).
That is not enough to finalize autonegatiation on some devices.
Increase this timer duration to maximum supported 16ms.

Signed-off-by: Max Uvarov <muvarov@...il.com>
Cc: Heiner Kallweit <hkallweit1@...il.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/phy/dp83867.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 29cae4de9a4f..ffaf67bdb140 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -26,6 +26,12 @@
 
 /* Extended Registers */
 #define DP83867_CFG4            0x0031
+#define DP83867_CFG4_SGMII_ANEG_MASK (BIT(5) | BIT(6))
+#define DP83867_CFG4_SGMII_ANEG_TIMER_11MS   (3 << 5)
+#define DP83867_CFG4_SGMII_ANEG_TIMER_800US  (2 << 5)
+#define DP83867_CFG4_SGMII_ANEG_TIMER_2US    (1 << 5)
+#define DP83867_CFG4_SGMII_ANEG_TIMER_16MS   (0 << 5)
+
 #define DP83867_RGMIICTL	0x0032
 #define DP83867_STRAP_STS1	0x006E
 #define DP83867_RGMIIDCTL	0x0086
@@ -292,6 +298,18 @@ static int dp83867_config_init(struct phy_device *phydev)
 				     0);
 		if (ret)
 			return ret;
+
+		/* After reset SGMII Autoneg timer is set to 2us (bits 6 and 5
+		 * are 01). That is not enough to finalize autoneg on some
+		 * devices. Increase this timer duration to maximum 16ms.
+		 */
+		ret = phy_modify_mmd(phydev, DP83867_DEVADDR,
+				     DP83867_CFG4,
+				     DP83867_CFG4_SGMII_ANEG_MASK,
+				     DP83867_CFG4_SGMII_ANEG_TIMER_16MS);
+
+		if (ret)
+			return ret;
 	}
 
 	/* Enable Interrupt output INT_OE in CFG3 register */
-- 
2.20.1