Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback
 support
To:     Oleksij Rempel <o.rempel@pengutronix.de>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Fugang Duan <fugang.duan@nxp.com>
Cc:     Philippe Schenker <philippe.schenker@toradex.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Russell King <linux@armlinux.org.uk>, linux-imx@nxp.com,
        kernel@pengutronix.de, David Jander <david@protonic.nl>,
        Fabio Estevam <festevam@gmail.com>,
        linux-arm-kernel@lists.infradead.org
References: <20210330135407.17010-1-o.rempel@pengutronix.de>
 <20210330135407.17010-3-o.rempel@pengutronix.de>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Message-ID: <de73886f-7264-2246-1c63-15e15ea1b17d@pengutronix.de>
Date:   Tue, 30 Mar 2021 16:08:09 +0200
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 Thunderbird/68.12.0
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In-Reply-To: <20210330135407.17010-3-o.rempel@pengutronix.de>
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Content-Type: multipart/mixed; boundary="ShqVL8TRdSmvaTCy9DzVvtglFq4r7MoPz";
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Oleksij Rempel <o.rempel@pengutronix.de>, Shawn Guo
 <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>,
 Andrew Lunn <andrew@lunn.ch>, Florian Fainelli <f.fainelli@gmail.com>,
 Heiner Kallweit <hkallweit1@gmail.com>, Fugang Duan <fugang.duan@nxp.com>
Cc: Philippe Schenker <philippe.schenker@toradex.com>,
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
 Russell King <linux@armlinux.org.uk>, linux-imx@nxp.com,
 kernel@pengutronix.de, David Jander <david@protonic.nl>,
 Fabio Estevam <festevam@gmail.com>, linux-arm-kernel@lists.infradead.org
Message-ID: <de73886f-7264-2246-1c63-15e15ea1b17d@pengutronix.de>
Subject: Re: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback
 support
References: <20210330135407.17010-1-o.rempel@pengutronix.de>
 <20210330135407.17010-3-o.rempel@pengutronix.de>
In-Reply-To: <20210330135407.17010-3-o.rempel@pengutronix.de>

--ShqVL8TRdSmvaTCy9DzVvtglFq4r7MoPz
Content-Type: text/plain; charset=utf-8
Content-Language: de-DE
Content-Transfer-Encoding: quoted-printable

On 3/30/21 3:54 PM, Oleksij Rempel wrote:
> PHY loopback is needed for the ethernet controller self test support.
> This PHY was tested with the FEC sefltest.
>=20
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/net/phy/at803x.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>=20
> 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);
>  }
> =20
> +static int at803x_loopback(struct phy_device *phydev, bool enable)
> +{
> +	int ret;
> +
> +	if (enable)
> +		ret =3D phy_clear_bits(phydev, MII_BMCR, BMCR_ANENABLE);
> +	else
> +		ret =3D phy_set_bits(phydev, MII_BMCR, BMCR_ANENABLE);
> +
> +	if (ret)
> +		return ret;
> +
> +	ret =3D genphy_loopback(phydev, enable);
> +
> +	/*
> +	 * Loop back needs some time to start transmitting packets in the loo=
p.
> +	 * Documentation says nothing about it, so I take time which seems to=

> +	 * work on AR8085.
> +	 */

/* Keep in mind the net multi line comment
 * style.
 */

Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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