linux-kernel - Re: [PATCH v4 27/35] mtd: rawnand: sm_common: convert driver to nand_scan_with

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Date:   Sun, 22 Jul 2018 08:44:32 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Wenyou Yang <wenyou.yang@...rochip.com>,
        Josh Wu <rainyfeeling@...look.com>,
        Tudor Ambarus <Tudor.Ambarus@...rochip.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Han Xu <han.xu@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Xiaolei Li <xiaolei.li@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Mans Rullgard <mans@...sr.com>, Stefan Agner <stefan@...er.ch>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 27/35] mtd: rawnand: sm_common: convert driver to
 nand_scan_with_ids()

On Fri, 20 Jul 2018 17:15:19 +0200
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> Two helpers have been added to the core to make ECC-related
> configuration between the detection phase and the final NAND scan. Use
> these hooks and convert the driver to just use nand_scan_with_ids()
> (alternative to nand_scan() for passing a flash IDs table) instead of
> both nand_scan_ident() and nand_scan_tail().
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>

> ---
>  drivers/mtd/nand/raw/sm_common.c | 39 +++++++++++++++++++++++++--------------
>  1 file changed, 25 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/sm_common.c b/drivers/mtd/nand/raw/sm_common.c
> index 7f5044a79f01..d05e3f976a5e 100644
> --- a/drivers/mtd/nand/raw/sm_common.c
> +++ b/drivers/mtd/nand/raw/sm_common.c
> @@ -160,19 +160,9 @@ static struct nand_flash_dev nand_xd_flash_ids[] = {
>  	{NULL}
>  };
>  
> -int sm_register_device(struct mtd_info *mtd, int smartmedia)
> +static int sm_attach_chip(struct nand_chip *chip)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int ret;
> -
> -	chip->options |= NAND_SKIP_BBTSCAN;
> -
> -	/* Scan for card properties */
> -	ret = nand_scan_ident(mtd, 1, smartmedia ?
> -		nand_smartmedia_flash_ids : nand_xd_flash_ids);
> -
> -	if (ret)
> -		return ret;
> +	struct mtd_info *mtd = nand_to_mtd(chip);
>  
>  	/* Bad block marker position */
>  	chip->badblockpos = 0x05;
> @@ -187,12 +177,33 @@ int sm_register_device(struct mtd_info *mtd, int smartmedia)
>  	else
>  		return -ENODEV;
>  
> -	ret = nand_scan_tail(mtd);
> +	return 0;
> +}
>  
> +static const struct nand_controller_ops sm_controller_ops = {
> +	.attach_chip = sm_attach_chip,
> +};
> +
> +int sm_register_device(struct mtd_info *mtd, int smartmedia)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	struct nand_flash_dev *flash_ids;
> +	int ret;
> +
> +	chip->options |= NAND_SKIP_BBTSCAN;
> +
> +	/* Scan for card properties */
> +	chip->dummy_controller.ops = &sm_controller_ops;
> +	flash_ids = smartmedia ? nand_smartmedia_flash_ids : nand_xd_flash_ids;
> +	ret = nand_scan_with_ids(mtd, 1, flash_ids);
>  	if (ret)
>  		return ret;
>  
> -	return mtd_device_register(mtd, NULL, 0);
> +	ret = mtd_device_register(mtd, NULL, 0);
> +	if (ret)
> +		nand_release(mtd);
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(sm_register_device);
>