linux-kernel - Re: [PATCH v3 39/52] mtd: nand: jz4780: switch to mtd_ooblayout

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Date:	Mon, 29 Feb 2016 10:45:56 +0000
From:	Harvey Hunt <harvey.hunt@...tec.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	<linux-mtd@...ts.infradead.org>
CC:	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	"Kukjin Kim" <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	<linux-samsung-soc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	<linux-mips@...ux-mips.org>,
	"Nicolas Ferre" <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Wenyou Yang <wenyou.yang@...el.com>,
	Josh Wu <rainyfeeling@...look.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, <linux-sunxi@...glegroups.com>,
	Stefan Agner <stefan@...er.ch>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	"punnaiah choudary kalluri" <punnaia@...inx.com>,
	Priit Laes <plaes@...es.org>,
	"Kamal Dasu" <kdasu.kdev@...il.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 39/52] mtd: nand: jz4780: switch to mtd_ooblayout_ops

Hi Boris,

On 26/02/16 00:57, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>   drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
>   1 file changed, 5 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
> index e1c016c..b86a579 100644
> --- a/drivers/mtd/nand/jz4780_nand.c
> +++ b/drivers/mtd/nand/jz4780_nand.c
> @@ -56,8 +56,6 @@ struct jz4780_nand_chip {
>   	struct nand_chip chip;
>   	struct list_head chip_list;
>
> -	struct nand_ecclayout ecclayout;
> -
>   	struct gpio_desc *busy_gpio;
>   	struct gpio_desc *wp_gpio;
>   	unsigned int reading: 1;
> @@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
>   	struct nand_chip *chip = &nand->chip;
>   	struct mtd_info *mtd = nand_to_mtd(chip);
>   	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
> -	struct nand_ecclayout *layout = &nand->ecclayout;
> -	u32 start, i;
> +	int eccbytes;
>
>   	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
>   				(chip->ecc.strength / 8);
> @@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
>   		return 0;
>
>   	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
> -	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
> +	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
>
> -	if (layout->eccbytes > mtd->oobsize - 2) {
> +	if (eccbytes > mtd->oobsize - 2) {
>   		dev_err(dev,
>   			"invalid ECC config: required %d ECC bytes, but only %d are available",
> -			layout->eccbytes, mtd->oobsize - 2);
> +			eccbytes, mtd->oobsize - 2);
>   		return -EINVAL;
>   	}
>
> -	start = mtd->oobsize - layout->eccbytes;
> -	for (i = 0; i < layout->eccbytes; i++)
> -		layout->eccpos[i] = start + i;
> -
> -	layout->oobfree[0].offset = 2;
> -	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
> +	mtd->ooblayout = &nand_ooblayout_lp_ops;
>
> -	chip->ecc.layout = layout;
>   	return 0;
>   }
>
>

With your patch applied [0] that you gave me earlier in the patchset, I 
am able to boot to userland on my Ci20 (jz4780_{nand,bch}) with a NAND 
rootfs. So, dependant upon that patch (or equivalent) being added to 
this patchset:

Tested-by: Harvey Hunt <harvey.hunt@...tec.com>

Thanks,

Harvey

[0] http://code.bulix.org/36oytz-91960