netdev - Re: mvneta: SGMII fixed-link not so fixed

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Message-ID: <20150918172222.GL21084@n2100.arm.linux.org.uk>
Date:	Fri, 18 Sep 2015 18:22:22 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	David Miller <davem@...emloft.net>, andrew@...n.ch,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: mvneta: SGMII fixed-link not so fixed

On Fri, Sep 18, 2015 at 07:04:09PM +0300, Stas Sergeev wrote:
> 18.09.2015 18:43, Russell King - ARM Linux пишет:
> > On Fri, Sep 18, 2015 at 05:45:27PM +0300, Stas Sergeev wrote:
> >> AFAICS if it has use_inband_status==true,
> >> then it went through of_phy_register_fixed_link(dn),
> > 
> > That's totally incorrect.  The test for setting use_inband_status in
> > mvneta is:
> > 
> >         err = of_property_read_string(dn, "managed", &managed);
> >         pp->use_inband_status = (err == 0 &&
> >                                  strcmp(managed, "in-band-status") == 0);
> 
> Arrrr! I was looking at the branch without the last
> patch applied, so it occurred to me as
> 
> 	pp->use_inband_status = (phy_mode == PHY_INTERFACE_MODE_SGMII) &&
> 		fixed_phy;
> 
> Sorry for that.

Yay :)

> So we seem to indeed have a nasty regression with the patch
> that just went to stable. :( Great news.

Yes.

> Thanks for you time.
> 
> I still have problems with this part though:
> > If there's neither a MDIO PHY nor a fixed-link, then the network driver
> > fails to initialise the device.
> 
> I think I am looking into the right source this time, seems like
> if we don't have both but still have managed="in-band-status", that
> should go the fixed-link path and still work... no?

If we have no fixed-link and no phy, then you're correct.

However, I really don't like the idea of abusing "fixed-link" as a
method to generate an ethtool/miitool/miidiag compatible output for
this, but I'm willing to let that pass for the moment. :)

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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