linux-kernel - [PATCH] net: phy: marvell: Fix pause frame negotiation

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Date:   Wed,  8 Apr 2020 23:43:26 +0200
From:   Clemens Gruber <clemens.gruber@...ruber.com>
To:     netdev@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org,
        Clemens Gruber <clemens.gruber@...ruber.com>,
        stable@...r.kernel.org
Subject: [PATCH] net: phy: marvell: Fix pause frame negotiation

The negotiation of flow control / pause frame modes was broken since
commit fcf1f59afc67 ("net: phy: marvell: rearrange to use
genphy_read_lpa()") moved the setting of phydev->duplex below the
phy_resolve_aneg_pause call. Due to a check of DUPLEX_FULL in that
function, phydev->pause was no longer set.

Fix it by moving the parsing of the status variable before the blocks
dealing with the pause frames.

Fixes: fcf1f59afc67 ("net: phy: marvell: rearrange to use genphy_read_lpa()")
Cc: stable@...r.kernel.org # v5.6+
Signed-off-by: Clemens Gruber <clemens.gruber@...ruber.com>
---
 drivers/net/phy/marvell.c | 44 +++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 4714ca0e0d4b..02cde4c0668c 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -1263,6 +1263,28 @@ static int marvell_read_status_page_an(struct phy_device *phydev,
 	int lpa;
 	int err;
 
+	if (!(status & MII_M1011_PHY_STATUS_RESOLVED))
+		return 0;
+
+	if (status & MII_M1011_PHY_STATUS_FULLDUPLEX)
+		phydev->duplex = DUPLEX_FULL;
+	else
+		phydev->duplex = DUPLEX_HALF;
+
+	switch (status & MII_M1011_PHY_STATUS_SPD_MASK) {
+	case MII_M1011_PHY_STATUS_1000:
+		phydev->speed = SPEED_1000;
+		break;
+
+	case MII_M1011_PHY_STATUS_100:
+		phydev->speed = SPEED_100;
+		break;
+
+	default:
+		phydev->speed = SPEED_10;
+		break;
+	}
+
 	if (!fiber) {
 		err = genphy_read_lpa(phydev);
 		if (err < 0)
@@ -1291,28 +1313,6 @@ static int marvell_read_status_page_an(struct phy_device *phydev,
 		}
 	}
 
-	if (!(status & MII_M1011_PHY_STATUS_RESOLVED))
-		return 0;
-
-	if (status & MII_M1011_PHY_STATUS_FULLDUPLEX)
-		phydev->duplex = DUPLEX_FULL;
-	else
-		phydev->duplex = DUPLEX_HALF;
-
-	switch (status & MII_M1011_PHY_STATUS_SPD_MASK) {
-	case MII_M1011_PHY_STATUS_1000:
-		phydev->speed = SPEED_1000;
-		break;
-
-	case MII_M1011_PHY_STATUS_100:
-		phydev->speed = SPEED_100;
-		break;
-
-	default:
-		phydev->speed = SPEED_10;
-		break;
-	}
-
 	return 0;
 }
 
-- 
2.26.0