linux-kernel - Re: [PATCH v2 2/4] net: ethoc: don't advertise gigabit speed on attached PHY

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Message-ID: <52E8A407.1020809@gmail.com>
Date:	Tue, 28 Jan 2014 22:47:35 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Max Filippov <jcmvbkbc@...il.com>, linux-xtensa@...ux-xtensa.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	Chris Zankel <chris@...kel.net>, Marc Gauthier <marc@...ence.com>,
	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: Re: [PATCH v2 2/4] net: ethoc: don't advertise gigabit speed on attached
 PHY

Hi Max,

Le 28/01/2014 22:00, Max Filippov a écrit :
> OpenCores 10/100 Mbps MAC does not support speeds above 100 Mbps, but does
> not disable advertisement when PHY supports them. This results in
> non-functioning network when the MAC is connected to a gigabit PHY connected
> to a gigabit switch.
>
> The fix is to disable gigabit speed advertisement on attached PHY
> unconditionally.
>
> Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
> ---
> Changes v1->v2:
> - disable both gigabit advertisement and support.
>
>   drivers/net/ethernet/ethoc.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
> index 4de8cfd..5643b2d 100644
> --- a/drivers/net/ethernet/ethoc.c
> +++ b/drivers/net/ethernet/ethoc.c
> @@ -688,6 +688,14 @@ static int ethoc_mdio_probe(struct net_device *dev)
>   	}
>
>   	priv->phy = phy;
> +	phy_update_advert(phy,
> +			  ADVERTISED_1000baseT_Full |
> +			  ADVERTISED_1000baseT_Half, 0);
> +	phy_start_aneg(phy);

This does not look necessary, you should not have to call 
phy_start_aneg() because the PHY state machine is not yet started, at 
best this calls does nothing.

> +	phy_update_supported(phy,
> +			     SUPPORTED_1000baseT_Full |
> +			     SUPPORTED_1000baseT_Half, 0);
> +
>   	return 0;
>   }
>
>

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