netdev - [PATCH net-next 2/2] net: phy: deal properly with autoneg incomplete in genphy_c45_read

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Date:   Sun, 31 Mar 2019 19:54:07 +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 2/2] net: phy: deal properly with autoneg incomplete
 in genphy_c45_read_lpa

The link partner advertisement registers are not guaranteed to contain
valid values if autoneg is incomplete. Therefore, if
MDIO_AN_STAT1_COMPLETE isn't set, let's clear all link partner
capability bits. This also avoids unnecessary register reads if link
is down and phylib is in polling mode.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy-c45.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 666fbb0ee..05c3e87ff 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -266,6 +266,17 @@ int genphy_c45_read_lpa(struct phy_device *phydev)
 	if (val < 0)
 		return val;
 
+	if (!(val & MDIO_AN_STAT1_COMPLETE)) {
+		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				   phydev->lp_advertising);
+		mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
+		mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, 0);
+		phydev->pause = 0;
+		phydev->asym_pause = 0;
+
+		return 0;
+	}
+
 	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->lp_advertising,
 			 val & MDIO_AN_STAT1_LPABLE);
 
-- 
2.21.0