linux-kernel - [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback support

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Date:   Tue, 30 Mar 2021 15:54:06 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fugang Duan <fugang.duan@....com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        Fabio Estevam <festevam@...il.com>,
        David Jander <david@...tonic.nl>,
        Russell King <linux@...linux.org.uk>,
        Philippe Schenker <philippe.schenker@...adex.com>
Subject: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback support

PHY loopback is needed for the ethernet controller self test support.
This PHY was tested with the FEC sefltest.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/phy/at803x.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index d7799beb811c..8679738cf2ab 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -326,6 +326,30 @@ static int at803x_resume(struct phy_device *phydev)
 	return phy_modify(phydev, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE, 0);
 }
 
+static int at803x_loopback(struct phy_device *phydev, bool enable)
+{
+	int ret;
+
+	if (enable)
+		ret = phy_clear_bits(phydev, MII_BMCR, BMCR_ANENABLE);
+	else
+		ret = phy_set_bits(phydev, MII_BMCR, BMCR_ANENABLE);
+
+	if (ret)
+		return ret;
+
+	ret = genphy_loopback(phydev, enable);
+
+	/*
+	 * Loop back needs some time to start transmitting packets in the loop.
+	 * Documentation says nothing about it, so I take time which seems to
+	 * work on AR8085.
+	 */
+	msleep(1);
+
+	return ret;
+}
+
 static int at803x_rgmii_reg_set_voltage_sel(struct regulator_dev *rdev,
 					    unsigned int selector)
 {
@@ -1128,6 +1152,7 @@ static struct phy_driver at803x_driver[] = {
 	.get_wol		= at803x_get_wol,
 	.suspend		= at803x_suspend,
 	.resume			= at803x_resume,
+	.set_loopback		= at803x_loopback,
 	/* PHY_GBIT_FEATURES */
 	.read_status		= at803x_read_status,
 	.config_intr		= at803x_config_intr,
-- 
2.29.2