linux-kernel - Re: [PATCH v4 8/9] mtd: rawnand: ingenic: Add support for the JZ4725B

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Message-Id: <1552481200.2412.0@crapouillou.net>
Date:   Wed, 13 Mar 2019 09:46:40 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 8/9] mtd: rawnand: ingenic: Add support for the JZ4725B

Hi Miquel,

Le lun. 4 mars 2019 à 16:09, Miquel Raynal <miquel.raynal@...tlin.com> 
a écrit :
> Hi Paul,
> 
> Paul Cercueil <paul@...pouillou.net> wrote on Mon, 04 Mar 2019 
> 19:30:04
> +0100:
> 
>>  On Mon, Mar 4, 2019 at 11:35 AM, Miquel Raynal 
>> <miquel.raynal@...tlin.com> wrote:
>>  > Hi Paul,
>>  >
>>  > Paul Cercueil <paul@...pouillou.net 
>> <mailto:paul@...pouillou.net>> > wrote on Sat,  9 Feb 2019 16:23:04
>>  > -0300:
>>  >
>>  >>  The boot ROM of the JZ4725B SoC expects a specific OOB layout 
>> on the
>>  >>  NAND, so we use it unconditionally in the ingenic-nand driver.
>>  >> >>  Also add the jz4725b-bch driver to support the 
>> JZ4725B-specific BCH
>>  >>  hardware.
>>  >> >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net >> 
>> <mailto:paul@...pouillou.net>>
>>  >>  ---
>>  >> >>  Changes:
>>  >> >>  v2: Instead of forcing the OOB layout, leave it to the board 
>> code or
>>  >>      devicetree to decide if the jz4725b-specific layout should 
>> be >> used
>>  >>      or not.
>>  >> >>  v3: - Revert the change in v2, as the previous behaviour was 
>> >> correct.
>>  >>      - Also add support for the hardware BCH of the JZ4725B in 
>> this
>>  >>        patch.
>>  >> >>  v4: - Add MODULE_* macros
>>  >>      - Add tweaks suggested by upstream feedback
>>  >> >>   drivers/mtd/nand/raw/ingenic/Kconfig        |  10 +
>>  >>   drivers/mtd/nand/raw/ingenic/Makefile       |   1 +
>>  >>   drivers/mtd/nand/raw/ingenic/ingenic_nand.c |  48 ++++-
>>  >>   drivers/mtd/nand/raw/ingenic/jz4725b_bch.c  | 292 >> 
>> ++++++++++++++++++++++++++++
>>  >>   4 files changed, 350 insertions(+), 1 deletion(-)
>>  >>   create mode 100644 drivers/mtd/nand/raw/ingenic/jz4725b_bch.c
>>  >> >
>>  > [...]
>>  >
>>  >>  +static int jz4725b_calculate(struct ingenic_ecc *bch,
>>  >>  +			     struct ingenic_ecc_params *params,
>>  >>  +			     const u8 *buf, u8 *ecc_code)
>>  >>  +{
>>  >>  +	int ret;
>>  >>  +
>>  >>  +	mutex_lock(&bch->lock);
>>  >>  +	ret = jz4725b_bch_init(bch, params, true);
>>  >
>>  > I really don't like this bch_init name. A BCH initialization is 
>> what > is
>>  > supposed to be done only once (probably at boot time), can you 
>> find a
>>  > better name or a better organization of the correct/calculate 
>> path?
>> 
>>  jz4725b_bch_setup() maybe?
> 
> Unless I am not understanding what this does, I don't get why you 
> would
> need to do this setup everytime you want to use the ECC engine. Are 
> you
> sure this is needed?

It configures the hardware for a new ECC encoding or decoding sequence, 
so
yes, it has to be done everytime.

-Paul