linux-kernel - Re: [PATCH net-next] net: mvneta: Add support for 2500Mbps SGMII

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Date:   Wed, 26 Sep 2018 20:27:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     maxime.chevallier@...tlin.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        antoine.tenart@...tlin.com, thomas.petazzoni@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, stefanc@...vell.com, mw@...ihalf.com,
        yelena@...vell.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next] net: mvneta: Add support for 2500Mbps SGMII

From: Maxime Chevallier <maxime.chevallier@...tlin.com>
Date: Tue, 25 Sep 2018 15:59:39 +0200

> The mvneta controller can handle speeds up to 2500Mbps on the SGMII
> interface. This relies on serdes configuration, the lane must be
> configured at 3.125Gbps and we can't use in-band autoneg at that speed.
> 
> The main issue when supporting that speed on this particular controller
> is that the link partner can send ethernet frames with a shortened
> preamble, which if not explicitly enabled in the controller will cause
> unexpected behaviours.
> 
> This was tested on Armada 385, with the comphy configuration done in
> bootloader.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>

Applied.