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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Serge Semin <fancer.lancer@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 05/49] net: phy: marvell: Fix MDI-x polarity setting in 88e1118-compatible PHYs
Date:   Mon, 14 Feb 2022 10:25:31 +0100
Message-Id: <20220214092448.476456387@linuxfoundation.org>
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From: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>

commit aec12836e7196e4d360b2cbf20cf7aa5139ad2ec upstream.

When setting up autonegotiation for 88E1118R and compatible PHYs,
a software reset of PHY is issued before setting up polarity.
This is incorrect as changes of MDI Crossover Mode bits are
disruptive to the normal operation and must be followed by a
software reset to take effect. Let's patch m88e1118_config_aneg()
to fix the issue mentioned before by invoking software reset
of the PHY just after setting up MDI-x polarity.

Fixes: 605f196efbf8 ("phy: Add support for Marvell 88E1118 PHY")
Signed-off-by: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Cc: stable@vger.kernel.org
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/phy/marvell.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -899,16 +899,15 @@ static int m88e1118_config_aneg(struct p
 {
 	int err;
 
-	err = genphy_soft_reset(phydev);
+	err = marvell_set_polarity(phydev, phydev->mdix_ctrl);
 	if (err < 0)
 		return err;
 
-	err = marvell_set_polarity(phydev, phydev->mdix_ctrl);
+	err = genphy_config_aneg(phydev);
 	if (err < 0)
 		return err;
 
-	err = genphy_config_aneg(phydev);
-	return 0;
+	return genphy_soft_reset(phydev);
 }
 
 static int m88e1118_config_init(struct phy_device *phydev)