netdev - Re: Question: pause mode disabled for marvell 88e151x phy

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Message-ID: <3f67e7ab-3a68-2a24-1648-36cac34ad6c0@huawei.com>
Date:   Thu, 24 Jan 2019 20:28:25 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Weiwei Deng <dengweiwei@...wei.com>,
        "Yisen.Zhuang@...wei.com" <Yisen.Zhuang@...wei.com>,
        "huangdaode@...ilicon.com" <huangdaode@...ilicon.com>,
        "lipeng321@...wei.com" <lipeng321@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        lijianhua 00216010 <lijianhua@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Question: pause mode disabled for marvell 88e151x phy

On 2019/1/24 6:41, Russell King - ARM Linux admin wrote:
> On Sat, Jan 05, 2019 at 11:28:19AM +0800, Yunsheng Lin wrote:
>> On 2018/12/17 22:36, Russell King - ARM Linux wrote:
>>> I'll try to do further diagnosis over Christmas in case I've missed
>>> something, but I suspect it may be one of those "weird behaviour" issues
>>> where the safest action is to disable pause mode as per my commit -
>>> which is far saner than having mismatched pause status on either end
>>> of a link.  However, given that Marvell specs are all NDA-only, it's
>>> very difficult to investigate beyond "this is the observed behaviour".
>>
>> Hi,
>>
>> Is there any update on the further diagnosis?
> 
> Hi,
> 
> I've finally been able to do some further diagnosis (with a 'scope).
> It would appear that the network adapter had PHY polling enabled,
> which meant that it overwrote the PHYs advertisement register
> during negotiation.  I thought I'd checked that scenario, but alas
> clearing the PHY poll enable bit on its own doesn't stop it polling!
> 
> I'll send a revert for the commit shortly.

Great. Thanks for the further diagnosis.

>