linux-kernel - Re: [PATCH v2 02/32] mtd: rawnand: brcmnand: convert driver to nand

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Date:   Wed, 4 Jul 2018 09:14:12 +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 v2 02/32] mtd: rawnand: brcmnand: convert driver to
 nand_scan()

On Tue,  3 Jul 2018 23:59:59 +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() instead of
> both nand_scan_ident() and nand_scan_tail().
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 43 ++++++++++++++++++--------------
>  1 file changed, 24 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 1306aaa7a8bf..99ab7b93756c 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -2208,6 +2208,28 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
>  	return 0;
>  }
>  
> +static int brcmnand_attach_chip(struct nand_chip *chip)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct brcmnand_host *host = nand_get_controller_data(chip);
> +	int ret;
> +
> +	if (chip->bbt_options & NAND_BBT_USE_FLASH)
> +		chip->bbt_options |= NAND_BBT_NO_OOB;
> +
> +	if (brcmnand_setup_dev(host))
> +		return -ENXIO;
> +
> +	chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512;
> +
> +	/* only use our internal HW threshold */
> +	mtd->bitflip_threshold = 1;
> +
> +	ret = brcmstb_choose_ecc_layout(host);
> +
> +	return ret;
> +}
> +
>  static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
>  {
>  	struct brcmnand_controller *ctrl = host->ctrl;
> @@ -2267,10 +2289,6 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
>  	nand_writereg(ctrl, cfg_offs,
>  		      nand_readreg(ctrl, cfg_offs) & ~CFG_BUS_WIDTH);
>  
> -	ret = nand_scan_ident(mtd, 1, NULL);
> -	if (ret)
> -		return ret;
> -
>  	chip->options |= NAND_NO_SUBPAGE_WRITE;
>  	/*
>  	 * Avoid (for instance) kmap()'d buffers from JFFS2, which we can't DMA
> @@ -2279,21 +2297,8 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
>  	 */
>  	chip->options |= NAND_USE_BOUNCE_BUFFER;
>  
> -	if (chip->bbt_options & NAND_BBT_USE_FLASH)
> -		chip->bbt_options |= NAND_BBT_NO_OOB;
> -
> -	if (brcmnand_setup_dev(host))
> -		return -ENXIO;
> -
> -	chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512;
> -	/* only use our internal HW threshold */
> -	mtd->bitflip_threshold = 1;
> -
> -	ret = brcmstb_choose_ecc_layout(host);
> -	if (ret)
> -		return ret;
> -
> -	ret = nand_scan_tail(mtd);
> +	chip->controller->attach_chip = brcmnand_attach_chip;

Hm, this assignment should be done once, when initializing the
controller (in brcmnand_probe()), not every time you add a NAND chip.

> +	ret = nand_scan(mtd, 1);
>  	if (ret)
>  		return ret;
>