netdev - Re: [PATCH 2/2] mvneta: use inband status only when link type is "auto"

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Message-ID: <559ED8F1.7050609@list.ru>
Date:	Thu, 9 Jul 2015 23:26:25 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Linux kernel <linux-kernel@...r.kernel.org>,
	Sebastien Rannou <mxs@...k.org>,
	Arnaud Ebalard <arno@...isbad.org>,
	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	netdev <netdev@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] mvneta: use inband status only when link type is
 "auto"

09.07.2015 21:18, Florian Fainelli пишет:
> On 09/07/15 10:41, Stas Sergeev wrote:
>> The commit 898b2970e2c9 ("mvneta: implement SGMII-based in-band link state
>> signaling") implemented the link parameters auto-negotiation unconditionally.
>> Unfortunately it appears that some HW that implements SGMII protocol,
>> doesn't generate the inband status, so it is not possible to auto-negotiate
>> anything with such HW.
> What is the purpose of using the in-band status in the first place if
> you end-up having to specify a 'fixed-link' property which contains most
> of the link parameters: speed, duplex etc...?
You don't have to.
My config from today is as simple as:

fixed-link {
   link = "auto";
};

and that's all.
Without my today's patch, only 'speed' is a mandatory - not too much.
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