linux-kernel - Re: [PATCH v5 2/2] mtd: rawnand: meson: add support for Amlogic NAND flash controller

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Date:   Thu, 18 Oct 2018 22:34:26 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Jianxin Pan <jianxin.pan@...ogic.com>
Cc:     <linux-mtd@...ts.infradead.org>,
        Liang Yang <liang.yang@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>, Jian Hu <jian.hu@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/2] mtd: rawnand: meson: add support for Amlogic
 NAND flash controller

On Thu, 18 Oct 2018 13:09:05 +0800
Jianxin Pan <jianxin.pan@...ogic.com> wrote:

> +static int meson_nand_bch_mode(struct nand_chip *nand)
> +{
> +	struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
> +	struct meson_nand_ecc meson_ecc[] = {
> +		MESON_ECC_DATA(NFC_ECC_BCH8_1K, 8),
> +		MESON_ECC_DATA(NFC_ECC_BCH24_1K, 24),
> +		MESON_ECC_DATA(NFC_ECC_BCH30_1K, 30),
> +		MESON_ECC_DATA(NFC_ECC_BCH40_1K, 40),
> +		MESON_ECC_DATA(NFC_ECC_BCH50_1K, 50),
> +		MESON_ECC_DATA(NFC_ECC_BCH60_1K, 60),
> +	};
> +	int i, ret = 0;
> +
> +	if (nand->ecc.strength > 60 || nand->ecc.strength < 8)
> +		return -EINVAL;
> +
> +	for (i = 0; i < sizeof(meson_ecc); i++) {
> +		if (meson_ecc[i].strength == nand->ecc.strength) {
> +			meson_chip->bch_mode = meson_ecc[i].bch;
> +			break;

			return 0;

> +		}
> +	}
> +
> +	return ret;

	return -EINVAL;

> +}