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From: Andrew Lunn <andrew@lunn.ch>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Fugang Duan <fugang.duan@nxp.com>,
	kernel@pengutronix.de, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-imx@nxp.com,
	Fabio Estevam <festevam@gmail.com>,
	David Jander <david@protonic.nl>,
	Russell King <linux@armlinux.org.uk>,
	Philippe Schenker <philippe.schenker@toradex.com>
Subject: Re: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback support
Date: Tue, 30 Mar 2021 16:49:28 +0200	[thread overview]
Message-ID: <YGM6eIopy5VBHu+T@lunn.ch> (raw)
In-Reply-To: <20210330135407.17010-3-o.rempel@pengutronix.de>

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@pengutronix.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

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Fugang Duan <fugang.duan@nxp.com>,
	kernel@pengutronix.de, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-imx@nxp.com,
	Fabio Estevam <festevam@gmail.com>,
	David Jander <david@protonic.nl>,
	Russell King <linux@armlinux.org.uk>,
	Philippe Schenker <philippe.schenker@toradex.com>
Subject: Re: [PATCH net-next v1 2/3] net: phy: at803x: AR8085: add loopback support
Date: Tue, 30 Mar 2021 16:49:28 +0200	[thread overview]
Message-ID: <YGM6eIopy5VBHu+T@lunn.ch> (raw)
In-Reply-To: <20210330135407.17010-3-o.rempel@pengutronix.de>

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@pengutronix.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

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-03-30 14:50 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30 13:54 [PATCH net-next v1 0/3] provide basic selftest support for the ethernet FEC driver Oleksij Rempel
2021-03-30 13:54 ` Oleksij Rempel
2021-03-30 13:54 ` [PATCH net-next v1 1/3] net: phy: micrel: KSZ8081: add loopback support Oleksij Rempel
2021-03-30 13:54   ` Oleksij Rempel
2021-03-30 14:06   ` Marc Kleine-Budde
2021-03-30 14:06     ` Marc Kleine-Budde
2021-03-30 14:39   ` Andrew Lunn
2021-03-30 14:39     ` Andrew Lunn
2021-03-30 13:54 ` [PATCH net-next v1 2/3] net: phy: at803x: AR8085: " Oleksij Rempel
2021-03-30 13:54   ` Oleksij Rempel
2021-03-30 14:08   ` Marc Kleine-Budde
2021-03-30 14:08     ` Marc Kleine-Budde
2021-03-30 14:49   ` Andrew Lunn [this message]
2021-03-30 14:49     ` Andrew Lunn
2021-03-30 13:54 ` [PATCH net-next v1 3/3] net: fec: add basic selftest support Oleksij Rempel
2021-03-30 13:54   ` Oleksij Rempel
2021-03-31  1:07   ` kernel test robot
2021-03-31  1:07     ` kernel test robot
2021-03-31  1:07     ` kernel test robot
2021-03-31 12:27   ` Andrew Lunn
2021-03-31 12:27     ` Andrew Lunn
2021-04-01  7:47     ` Oleksij Rempel
2021-04-01  7:47       ` Oleksij Rempel
2021-04-01 16:06       ` Florian Fainelli
2021-04-01 16:06         ` Florian Fainelli

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