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

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Date:   Mon, 04 Mar 2019 19:30:04 +0100
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


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?

>>  +	if (ret) {
>>  +		dev_err(bch->dev, "Unable to init BCH with given parameters\n");
>>  +		goto out_disable;
>>  +	}
>>  +
>>  +	jz4725b_bch_write_data(bch, buf, params->size);
>>  +
>>  +	ret = jz4725b_bch_wait_complete(bch, BCH_BHINT_ENCF, NULL);
>>  +	if (ret) {
>>  +		dev_err(bch->dev, "timed out while calculating ECC\n");
>>  +		goto out_disable;
>>  +	}
>>  +
>>  +	jz4725b_bch_read_parity(bch, ecc_code, params->bytes);
>>  +
>>  +out_disable:
>>  +	jz4725b_bch_disable(bch);
>>  +	mutex_unlock(&bch->lock);
>>  +
>>  +	return ret;
>>  +}
>>  +
> 
> [...]
> 
> Thanks,
> Miquèl