linux-kernel - Re: [RFC PATCH 0/2] mtd: rawnand: support MT29F1G08ABAFAWP-ITE:F

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Message-ID: <f16525ea6b534123bda64b09e818ce6d@svr-chch-ex1.atlnz.lc>
Date:   Tue, 19 Jun 2018 00:35:00 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
CC:     "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/2] mtd: rawnand: support MT29F1G08ABAFAWP-ITE:F

On 19/06/18 01:15, Miquel Raynal wrote:
> Hi Chris,
> 
> On Mon, 18 Jun 2018 16:52:53 +1200, Chris Packham
> <chris.packham@...iedtelesis.co.nz> wrote:
> 
>> Hi,
>>
>> I'm looking at adding support for the Micron MT29F1G08ABAFAWP-ITE:F chip
>> to one of our boards which uses the Marvell NFCv2 controller.
>>
>> This particular chip is a bit odd in that the datasheet states support
>> for ONFI 1.0 but the revision number field is 00 00. It also is marked
>> ABAFA but reports internally as ABAGA. Finally it has internal 8-bit ECC
>> which cannot be disabled.
> 
> Boris and I agree that in this case, the chip should not be probed if
> ecc->type != ON_DIE (and eventually NONE).
> 
> This should be handled in the Micron driver.
> 
> Also, what is the returned value of micron_supports_on_die_ecc() (with
> patch 1/2)?

micron_supports_on_die_ecc() returns MICRON_ON_DIE_UNSUPPORTED. 
Technically this chip should be MICRON_ON_DIE_MANDATORY since it can't 
be disabled but that wouldn't be much help since that would still result 
in -EINVAL. I'll dig into micron_supports_on_die_ecc() and see if I can 
find something in the datasheet to use.

> 
> Regards,
> Miquèl
>