netdev - [PATCH net-next] net: phy: don't set autoneg if it's not supported

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Message-ID: <86573735-5b70-4214-8acc-92763fc6e043@gmail.com>
Date:   Tue, 16 Apr 2019 23:54:00 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: phy: don't set autoneg if it's not supported

In phy_device_create() we set phydev->autoneg = 1. This isn't changed
even if the PHY doesn't support autoneg. This seems to affect very
few PHY's, and they disable phydev->autoneg in their config_init
callback. So it's more of an improvement, therefore net-next.
The patch also wouldn't apply to older kernel versions because the
link mode bitmaps have been introduced recently.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 5eb905ab5..2d2b654e8 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2158,6 +2158,10 @@ static int phy_probe(struct device *dev)
 	if (err)
 		goto out;
 
+	if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+			       phydev->supported))
+		phydev->autoneg = 0;
+
 	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 			      phydev->supported))
 		phydev->is_gigabit_capable = 1;
-- 
2.21.0