netdev - [PATCH] net: phy: marvell: Add errata section 5.1 for Alaska PHY

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Date:   Tue, 15 Mar 2022 08:48:27 +0100
From:   Stefan Roese <sr@...x.de>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH] net: phy: marvell: Add errata section 5.1 for Alaska PHY

From: Leszek Polak <lpolak@...i.de>

As per Errata Section 5.1, if EEE is intended to be used, some register
writes must be done once after every hardware reset. This patch now adds
the necessary register writes as listed in the Marvell errata.

Without this fix we experience ethernet problems on some of our boards
equipped with a new version of this ethernet PHY (different supplier).

The fix applies to Marvell Alaska 88E1510/88E1518/88E1512/88E1514
Rev. A0.

Signed-off-by: Leszek Polak <lpolak@...i.de>
Signed-off-by: Stefan Roese <sr@...x.de>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>
Cc: Russell King <linux@...linux.org.uk>
Cc: David S. Miller <davem@...emloft.net>
---
 drivers/net/phy/marvell.c | 42 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 2429db614b59..0f4a3ab4a415 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -1179,6 +1179,48 @@ static int m88e1510_config_init(struct phy_device *phydev)
 {
 	int err;
 
+	/* As per Marvell Release Notes - Alaska 88E1510/88E1518/88E1512/
+	 * 88E1514 Rev A0, Errata Section 5.1:
+	 * If EEE is intended to be used, the following register writes
+	 * must be done once after every hardware reset.
+	 */
+	err = marvell_set_page(phydev, 0x00FF);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 17, 0x214B);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 16, 0x2144);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 17, 0x0C28);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 16, 0x2146);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 17, 0xB233);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 16, 0x214D);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 17, 0xCC0C);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 16, 0x2159);
+	if (err < 0)
+		return err;
+	err = marvell_set_page(phydev, 0x00FB);
+	if (err < 0)
+		return err;
+	err = phy_write(phydev, 07, 0xC00D);
+	if (err < 0)
+		return err;
+	err = marvell_set_page(phydev, MII_MARVELL_COPPER_PAGE);
+	if (err < 0)
+		return err;
+
 	/* SGMII-to-Copper mode initialization */
 	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
 		/* Select page 18 */
-- 
2.35.1