linux-kernel - Re: [PATCH] net/phy: micrel: Add workaround for bad autoneg

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Message-ID: <CAGVrzcZNcvkw_egX0rAOe_CZnrQj8pDONJDr973Dw-ec1Ce91g@mail.gmail.com>
Date:	Wed, 21 Oct 2015 12:20:21 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Nathan Sullivan <nathan.sullivan@...com>
Cc:	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/phy: micrel: Add workaround for bad autoneg

2015-10-21 12:17 GMT-07:00 Nathan Sullivan <nathan.sullivan@...com>:
> Very rarely, the KSZ9031 will appear to complete autonegotiation, but
> will drop all traffic afterwards.  When this happens, the idle error
> count will read 0xFF after autonegotiation completes.  Reset the PHY
> when in that state.
>
> Signed-off-by: Nathan Sullivan <nathan.sullivan@...com>
> ---
>  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 499185e..cf6312f 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -514,6 +514,27 @@ static int ksz8873mll_read_status(struct phy_device *phydev)
>         return 0;
>  }
>
> +static int ksz9031_read_status(struct phy_device *phydev)
> +{
> +       int err;
> +       int regval;
> +
> +       err = genphy_read_status(phydev);
> +       if (err)
> +               return err;
> +
> +       /* Make sure the PHY is not broken. Read idle error count,
> +        * and reset the PHY if it is maxed out.
> +        */
> +       regval = phy_read(phydev, MII_STAT1000);
> +       if ((regval & 0xFF) == 0xFF) {

Don't you also need to set phydev->state to PHY_READY here to force
the state machine to restart?

> +               phy_init_hw(phydev);
> +               phydev->link = 0;
> +       }
> +
> +       return 0;
> +}
> +
>  static int ksz8873mll_config_aneg(struct phy_device *phydev)
>  {
>         return 0;
> @@ -772,7 +793,7 @@ static struct phy_driver ksphy_driver[] = {
>         .driver_data    = &ksz9021_type,
>         .config_init    = ksz9031_config_init,
>         .config_aneg    = genphy_config_aneg,
> -       .read_status    = genphy_read_status,
> +       .read_status    = ksz9031_read_status,
>         .ack_interrupt  = kszphy_ack_interrupt,
>         .config_intr    = kszphy_config_intr,
>         .suspend        = genphy_suspend,
> --
> 1.7.10.4
>



-- 
Florian
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