linux-kernel - Re: [PATCH 4/9] mtd: pxa3xx_nand: add a default chunk size

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Message-ID: <20150208211508.7b7d2632@bbrezillon>
Date:	Sun, 8 Feb 2015 21:15:08 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
Cc:	sebastian.hesselbarth@...il.com,
	ezequiel.garcia@...e-electrons.com, dwmw2@...radead.org,
	computersforpeace@...il.com, thomas.petazzoni@...e-electrons.com,
	zmxu@...vell.com, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, jszhang@...vell.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/9] mtd: pxa3xx_nand: add a default chunk size

On Tue, 27 Jan 2015 15:10:11 +0100
Antoine Tenart <antoine.tenart@...e-electrons.com> wrote:

> Add a default chunk size of 512 in the pxa3xx nand driver.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
>  drivers/mtd/nand/pxa3xx_nand.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
> index 782ae24d6b7d..b2783b1f663c 100644
> --- a/drivers/mtd/nand/pxa3xx_nand.c
> +++ b/drivers/mtd/nand/pxa3xx_nand.c
> @@ -1430,6 +1430,9 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
>  	if (pdata->keep_config && !pxa3xx_nand_detect_config(info))
>  		goto KEEP_CONFIG;
>  
> +	/* Set a default chunk size */

Could you explain why you need to set this default chunk size ?
I guess it's because your NAND is not configured by the bootloader, and
thus you did not specify the keep-config attribute in the DT.
And I guess you need this field to be initialized before pxa_ecc_init is
called (for some NAND operations done in the meantime: READID ?).

Moreover, IMHO this should be place in an 'else' statement, otherwise
you'll overwrite the value set in pxa3xx_nand_detect_config.


> +	info->chunk_size = 512;
> +
>  	ret = pxa3xx_nand_sensing(info);
>  	if (ret) {
>  		dev_info(&info->pdev->dev, "There is no chip on cs %d!\n",



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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