linux-kernel - [PATCH net-next v1 3/4] net: phy: micrel: disable 1000Mbit EEE support if 1000Mbit is not supported

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Message-Id: <20230119131821.3832456-4-o.rempel@pengutronix.de>
Date:   Thu, 19 Jan 2023 14:18:20 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com
Subject: [PATCH net-next v1 3/4] net: phy: micrel: disable 1000Mbit EEE support if 1000Mbit is not supported

KSZ8563 is announcing by default 1000Mbit EEE support, but at same time
do not supporting 1000Mbit speed.

This patch will disable 1000Mbit EEE advertisement if the PHY is not
1000Mbit capable.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/phy/micrel.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 099f1e83c08c..11bef217b45a 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1460,6 +1460,27 @@ static int ksz9477_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 	return 0;
 }
 
+static int ksz9477_config_init(struct phy_device *phydev)
+{
+	int ret;
+
+	/* KSZ8563 is able to advertise not supported MDIO_EEE_1000T.
+	 * We need to test if the PHY is 1Gbit capable.
+	 */
+	ret = phy_read(phydev, MII_BMSR);
+	if (ret < 0)
+		return ret;
+
+	if (!(ret & BMSR_ERCAP)) {
+		ret = phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV,
+					 MDIO_EEE_1000T);
+		if (ret)
+			return ret;
+	}
+
+	return kszphy_config_init(phydev);
+}
+
 #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
 #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX	BIT(6)
 #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED	BIT(4)
@@ -3507,7 +3528,7 @@ static struct phy_driver ksphy_driver[] = {
 	.phy_id_mask	= MICREL_PHY_ID_MASK,
 	.name		= "Microchip KSZ9477",
 	/* PHY_GBIT_FEATURES */
-	.config_init	= kszphy_config_init,
+	.config_init	= ksz9477_config_init,
 	.config_intr	= kszphy_config_intr,
 	.handle_interrupt = kszphy_handle_interrupt,
 	.suspend	= genphy_suspend,
-- 
2.30.2