netdev - Re: Marvell phy errata origins?

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Message-ID: <e394e72c-c6a6-457a-40dd-d84cca534d21@cisco.com>
Date:   Wed, 26 Sep 2018 08:35:04 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Harini Katakam <harinik@...inx.com>, Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, afleming@...escale.com,
        Harini Katakam <harini.katakam@...inx.com>,
        netdev@...r.kernel.org, hramdasi@...co.com, jpitti@...co.com,
        gcasheek@...co.com
Subject: Re: Marvell phy errata origins?

On 09/25/2018 10:42 PM, Harini Katakam wrote:
> Hi,
> On Tue, Sep 25, 2018 at 11:00 PM Harini Katakam <harinik@...inx.com> wrote:
>>
>> Hi Daniel,
>>
>> On Tue, Sep 25, 2018 at 9:10 PM Andrew Lunn <andrew@...n.ch> wrote:
>>>
>>>> I hope this this thread isn't too old to bring back to life. So it seems
>>>> that Harini found that m88e1111 did not need this errata, and Cisco
>>>> previously found that Harini's patch fixed m88e1112, we included it
>>>> internally for that reason
>>>>
>>>> Now I'm getting reports that this errata fixes issues we're seeing on
>>>> m88e1111. We see an interrupt storm without the errata, despite the errata
>>>> not being defined in the datasheet.
>>>
>>> Is everybody actually using interrupts? It could be in one system
>>> phylib is polling.
>>>
>>
>> Yes, we weren't using interrupts; we used phy poll.
>>
>> As I recall, the register and page combination was reserved and
>> the access seemed to fail.
>> It will be useful if we can the errata description or version details.
>> I'll check if I can get any more information.
> 
> One of the PHY parts used was "88E1111-B2-bab1i000"

I doubt I can find this level of detail .. We have many of these 
machines in the field so they may have different part numbers.

I may have been given some incorrect details on the issue. I'm not 
currently sure this errata code is related. I'll let you know when I 
have more information.

Daniel