netdev - RE: Marvell phy errata origins?

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Message-ID: <A00F2239C6748D4289A006FCD55C6D126F1901B7@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:   Tue, 18 Apr 2017 14:31:35 +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>
Subject: RE: Marvell phy errata origins?

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.

Regards,
Harini