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

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Date:   Tue, 30 Mar 2021 16:49:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fugang Duan <fugang.duan@....com>, 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: Re: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback
 support

On Tue, Mar 30, 2021 at 03:54:06PM +0200, Oleksij Rempel wrote:
> 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);

Auto-neg might of been turned off when entering self test. So you
should leave it off when existing self test.

Or maybe call phy_config_aneg() which should reconfigure the PHY back
how it was.

       Andrew