netdev - Re: Marvell phy errata origins?

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Message-ID: <93efb026-adbf-d341-166b-90e19d9afb55@cisco.com>
Date:   Tue, 18 Apr 2017 07:35:21 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Harini Katakam <harini.katakam@...inx.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andy Fleming <afleming@...escale.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        HEMANT RAMDASI <hramdasi@...co.com>,
        "Julius Hemanth Pitti -X (jpitti - MONTA VISTA SOFTWARE INC at Cisco)" 
        <jpitti@...co.com>
Subject: Re: Marvell phy errata origins?

On 04/18/2017 07:31 AM, Harini Katakam wrote:
> Hi Daniel,
>
>> -----Original Message-----
>> From: Daniel Walker [mailto:danielwa@...co.com]
>> Sent: Tuesday, April 18, 2017 7:48 PM
>> To: Andrew Lunn <andrew@...n.ch>
>> Cc: Florian Fainelli <f.fainelli@...il.com>; Andy Fleming
>> <afleming@...escale.com>; Harini Katakam <harinik@...inx.com>;
>> netdev@...r.kernel.org; HEMANT RAMDASI <hramdasi@...co.com>; Julius
>> Hemanth Pitti -X (jpitti - MONTA VISTA SOFTWARE INC at Cisco)
>> <jpitti@...co.com>
>> Subject: Re: Marvell phy errata origins?
>>
>> On 04/18/2017 07:04 AM, Andrew Lunn wrote:
>>> On Tue, Apr 18, 2017 at 06:16:33AM -0700, Daniel Walker wrote:
> <snip>
>>>> In Harini's commit
>>>> message for ,
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/co
>>>> mmit/drivers/net/phy/marvell.c?id=3ec0a0f10ceb
>>>>
>>>> "This function has a sequence accessing Page 5 and Register 31, both
>>>> of which are not defined or reserved for this PHY"
>>>>
>>>> For the 88E1112 we see that these are "Factory Test Modes" which the
>>>> contents of are not documented. They aren't really "not defied", and
>>>> aren't really "reserved" .. Marvell support claims they don't support
>>>> these drivers, and Freescale seems to be adding these drivers, and
>>>> the line we are looking at.
>>>>
>>>> We had some issues with our PHY which were corrected with the same
>>>> patch Harini used but modified for the M88E1112. We're trying to get
>>>> to the bottom of where this code came from and what it was suppose to
>>>> be doing.
>>> I tried to find this errata fix in the Marvell reference code. And
>>> failed to find it. But it is "Vendor Crap" code, hard to find anything
>>> in it.
>>>
>>> My guess is, this errata just applies to one model of PHY, maybe even
>>> one revision of one model of a PHY. The hard bit is figuring out what
>>> actually needs it. Do you have access to Marvell datasheets?
> I have access to the datasheets for 88E1111, 88E1112 and 88E1116 (and another family 151x) -
> None of them have these register details or the errata documented.

http://www.dexsilicium.com/Marvell_88E1112.pd


Is this the same datasheet ? In this one on page 81 there is page 5 
register 31 is "Factory Test Modes" , do you not have that?

Daniel