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

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Message-ID: <e968c0cf-f69f-7f1d-a0db-b856f4c50755@free.fr>
Date:   Mon, 11 Dec 2017 15:47:54 +0100
From:   Mason <slash.tmp@...e.fr>
To:     Mans Rullgard <mans@...sr.com>
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

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.

Regards.