linux-kernel - Re: [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt

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Message-ID: <20170425200911.d7zfakqs5k5zwisg@piout.net>
Date:   Tue, 25 Apr 2017 22:09:11 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Alexander Kochetkov <al.kochet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Roger Quadros <rogerq@...com>,
        Madalin Bucur <madalin.bucur@....com>
Subject: Re: [PATCH v1] net: phy: fix auto-negotiation stall due to
 unavailable interrupt

Hi,

On 25/04/2017 at 18:25:30 +0300, Alexander Kochetkov wrote:
> Hello David!
> 
> > 25 апр. 2017 г., в 17:36, David Miller <davem@...emloft.net> написал(а):
> > 
> > So... what are we doing here?
> > 
> > My understanding is that this should fix the same problem that commit
> > 99f81afc139c6edd14d77a91ee91685a414a1c66 ("phy: micrel: Disable auto
> > negotiation on startup") fixed and that this micrel commit should thus
> > be reverted to improve MAC startup times which regressed.
> > 
> > Florian, any guidance?
> 
> Yes, this should be done.
> 
> I aksed Alexandre to check if 99f81afc139c6edd14d77a91ee91685a414a1c66 ("phy: micrel: Disable auto
> negotiation on startup») can be reverted, and he answered what it may do that
> sometime this/next week.
> 

Yes, it can be safely reverted after Alexander's patch. I had to test on
v4.7 because we are not using interrupts on those boards since v4.8
(another issue to be fixed).

As Florian pointed out, at the time I sent my patch, I didn't have time
to investigate whether this was affecting other phys, see
https://lkml.org/lkml/2016/2/26/766

I can send the revert or you can do it.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com