From mboxrd@z Thu Jan  1 00:00:00 1970
From: Miquel Raynal <miquel.raynal@bootlin.com>
Subject: Re: [PATCH v4 8/9] mtd: rawnand: ingenic: Add support for the
 JZ4725B
Date: Mon, 4 Mar 2019 11:35:19 +0100
Message-ID: <20190304113519.2e102b25@xps13>
References: <20190209192305.4434-1-paul@crapouillou.net>
        <20190209192305.4434-8-paul@crapouillou.net>
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To: Paul Cercueil <paul@crapouillou.net>
Cc: David Woodhouse <dwmw2@infradead.org>, Brian Norris <computersforpeace@gmail.com>, Boris Brezillon <bbrezillon@kernel.org>, Marek Vasut <marek.vasut@gmail.com>, Richard Weinberger <richard@nod.at>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Harvey Hunt <harveyhuntnexus@gmail.com>, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
List-Id: devicetree@vger.kernel.org

Hi Paul,

Paul Cercueil <paul@crapouillou.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@crapouillou.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?

> +	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