netdev - Re: [PATCH v3] net: sh_eth: do not advertise Gigabit capabilities when not available

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Date:   Mon, 11 Dec 2017 11:54:06 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     thomas.petazzoni@...e-electrons.com
Cc:     sergei.shtylyov@...entembedded.com,
        niklas.soderlund+renesas@...natech.se, geert+renesas@...der.be,
        horms+renesas@...ge.net.au, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v3] net: sh_eth: do not advertise Gigabit capabilities
 when not available

From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Date: Fri,  8 Dec 2017 16:35:40 +0100

> 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>

Applied, thanks.