netdev - Re: [PATCH net] net: phy: micrel: set soft_reset callback to genphy_soft

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Message-ID: <6ad9a9c8-3f65-b16e-19d1-b54efb3a0b70@gmail.com>
Date:   Thu, 10 Jan 2019 11:24:57 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH net] net: phy: micrel: set soft_reset callback to
 genphy_soft_reset for KSZ9031

On 1/10/19 11:22 AM, Heiner Kallweit wrote:
> So far genphy_soft_reset was used automatically if the PHY driver
> didn't implement the soft_reset callback. This changed with the
> mentioned commit and broke KSZ9031. To fix this configure the
> KSZ9031 PHY driver to use genphy_soft_reset.
> 
> Fixes: 6e2d85ec0559 ("net: phy: Stop with excessive soft reset")
> Reported-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Thanks a lot for following up with the people at TI on this. We should
really get a better understanding of what the issue is, and whether
there is a possibly better workaround that could be developed which is
not just as hard as a big hammer software reset. Maybe we can get some
people/contacts at Micrel to help here.

> ---
>  drivers/net/phy/micrel.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index c33384710..7828d17f0 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -1070,6 +1070,7 @@ static struct phy_driver ksphy_driver[] = {
>  	.driver_data	= &ksz9021_type,
>  	.probe		= kszphy_probe,
>  	.config_init	= ksz9031_config_init,
> +	.soft_reset	= genphy_soft_reset,
>  	.read_status	= ksz9031_read_status,
>  	.ack_interrupt	= kszphy_ack_interrupt,
>  	.config_intr	= kszphy_config_intr,
> 


-- 
Florian