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

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Message-ID: <20150208211819.6858a3ee@bbrezillon>
Date:	Sun, 8 Feb 2015 21:18:19 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	ezequiel.garcia@...e-electrons.com, jszhang@...vell.com,
	computersforpeace@...il.com, dwmw2@...radead.org,
	linux-arm-kernel@...ts.infradead.org,
	sebastian.hesselbarth@...il.com
Subject: Re: [PATCH 4/9] mtd: pxa3xx_nand: add a default chunk size

On Sun, 8 Feb 2015 21:15:08 +0100
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> 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.

My bad, I didn't notice the 'goto KEEP_CONFIG' statement.

> 
> 
> > +	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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