netdev - Re: Waiting for the PHY to complete auto-negotiation

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Message-ID: <yw1xtvwxtebu.fsf@mansr.com>
Date:   Mon, 11 Dec 2017 16:32:53 +0000
From:   Måns Rullgård <mans@...sr.com>
To:     Mason <slash.tmp@...e.fr>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: Waiting for the PHY to complete auto-negotiation

Mason <slash.tmp@...e.fr> writes:

> On 11/12/2017 15:36, Måns Rullgård wrote:
>
>> Mason writes:
>> 
>>> I suppose I should test forcefully setting the enable bit to 0 in
>>> the driver, and see if hell breaks loose.
>> 
>> You can't.  When the enable bit is 1, writes to that register are
>> ignored.  It goes back to 0 automatically when the hw runs out of
>> descriptors.
>
> I don't think they are ignored, because toggling the control flow
> bit actually breaks RX.

Oh, then it's even worse than the docs suggest.

-- 
Måns Rullgård