netdev - RE: Marvell phy errata origins?

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Date:   Tue, 18 Apr 2017 14:41:13 +0000
From:   Harini Katakam <harini.katakam@...inx.com>
To:     Daniel Walker <danielwa@...co.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>,
        "harinikatakamlinux@...il.com" <harinikatakamlinux@...il.com>
Subject: RE: Marvell phy errata origins?

Hi Daniel,

> -----Original Message-----
> From: Daniel Walker [mailto:danielwa@...co.com]
> Sent: Tuesday, April 18, 2017 8:05 PM
> To: Harini Katakam <harinik@...inx.com>; Andrew Lunn <andrew@...n.ch>
> Cc: Florian Fainelli <f.fainelli@...il.com>; Andy Fleming
> <afleming@...escale.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 07:31 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?

Yes, it is the same datasheet. That is what I meant - it just says factory test modes
But there is no register description.

Regards,
Harini