netdev - Re: [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available

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Message-ID: <20171205175515.GR12805@lunn.ch>
Date:   Tue, 5 Dec 2017 18:55:15 +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 v2] net: sh_eth: do not advertise Gigabit capabilities
 when not available

On Tue, Dec 05, 2017 at 10:29:52AM +0100, Thomas Petazzoni wrote:
> Not all variants of the sh_eth hardware have Gigabit
> support. Unfortunately, the current driver doesn't tell the PHY about
> the limited 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 use the recently introduced
> phy_set_max_speed() to tell the PHY to not advertise speed higher than
> 100 MBit/s.
> 
> 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