linux-kernel - Re: [PATCH v3 1/6] mtd: rawnand: add Reed-Solomon error correction algorithm

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Date:   Fri, 01 Jun 2018 15:34:33 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     mark.rutland@....com, devicetree@...r.kernel.org,
        pgaikwad@...dia.com, dev@...xeye.de, mirza.krak@...il.com,
        benjamin.lindqvist@...ian.se, pdeschrijver@...dia.com,
        miquel.raynal@...tlin.com, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, jonathanh@...dia.com, marek.vasut@...il.com,
        thierry.reding@...il.com, linux-mtd@...ts.infradead.org,
        krzk@...nel.org, richard@....at, linux-tegra@...r.kernel.org,
        digetx@...il.com, computersforpeace@...il.com, dwmw2@...radead.org,
        marcel@...wiler.com
Subject: Re: [PATCH v3 1/6] mtd: rawnand: add Reed-Solomon error correction
 algorithm

On 01.06.2018 11:25, Boris Brezillon wrote:
> On Fri, 1 Jun 2018 09:26:00 +0200
> Boris Brezillon <boris.brezillon@...tlin.com> wrote:
> 
>> On Fri,  1 Jun 2018 00:16:32 +0200
>> Stefan Agner <stefan@...er.ch> wrote:
>>
>> > Add Reed-Solomon (RS) to the enumeration of ECC algorithms.
>> >
>> > Signed-off-by: Stefan Agner <stefan@...er.ch>
>>
>> Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>
>>
>> > ---
>> >  drivers/mtd/nand/raw/nand_base.c | 1 +
>> >  include/linux/mtd/rawnand.h      | 1 +
> 
> Hm, you forgot to update Documentation/devicetree/bindings/mtd/nand.txt.
> 

Yeah I was not sure about that. Currently it says:

- nand-ecc-algo: string, algorithm of NAND ECC.                         

                 Supported values are: "hamming", "bch".

Is supported meant by software ECC here? I feel "supported" is a rather
strong word since it is clearly controller dependent whether it is
actually supported...

--
Stefan

>> >  2 files changed, 2 insertions(+)
>> >
>> > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
>> > index f28c3a555861..9eb5678dd6d0 100644
>> > --- a/drivers/mtd/nand/raw/nand_base.c
>> > +++ b/drivers/mtd/nand/raw/nand_base.c
>> > @@ -5744,6 +5744,7 @@ static int of_get_nand_ecc_mode(struct device_node *np)
>> >  static const char * const nand_ecc_algos[] = {
>> >  	[NAND_ECC_HAMMING]	= "hamming",
>> >  	[NAND_ECC_BCH]		= "bch",
>> > +	[NAND_ECC_RS]		= "rs",
>> >  };
>> >
>> >  static int of_get_nand_ecc_algo(struct device_node *np)
>> > diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
>> > index 5dad59b31244..6a82da8c44ce 100644
>> > --- a/include/linux/mtd/rawnand.h
>> > +++ b/include/linux/mtd/rawnand.h
>> > @@ -114,6 +114,7 @@ enum nand_ecc_algo {
>> >  	NAND_ECC_UNKNOWN,
>> >  	NAND_ECC_HAMMING,
>> >  	NAND_ECC_BCH,
>> > +	NAND_ECC_RS,
>> >  };
>> >
>> >  /*
>>
>>
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/

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