netdev - Re: [PATCH] net: sh_eth: do not advertise Gigabit capabilities when not available

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Message-ID: <20171204150904.GD4026@lunn.ch>
Date:   Mon, 4 Dec 2017 16:09:04 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms+renesas@...ge.net.au>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] net: sh_eth: do not advertise Gigabit capabilities when
 not available

On Mon, Dec 04, 2017 at 03:13:46PM +0100, Thomas Petazzoni wrote:
> Not all variants of the sh_eth hardware have Gigabit
> support. Unfortunately, the current driver doesn't update
> phydev->supported depending on the MAC capabilities. Due to this, if
> you have a Gigabit capable PHY, the PHY will advertise its Gigabit
> capability and establish a link at 1Gbit/s, even though the MAC
> doesn't support it.
> 
> In order to avoid this, we mark phydev->supported if we're running a
> non-Gigabit capable hardware.
> 
> Tested on a SH7786 platform, with a Gigabit PHY.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew