linux-kernel - Re: mxc_nand.c on mach-imx/imx53

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Date:	Mon, 3 Sep 2012 10:55:17 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Roland Stigge <stigge@...com.de>
Cc:	Eric Bénard <eric@...rea.com>,
	linux-mtd@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: mxc_nand.c on mach-imx/imx53

On Fri, Aug 31, 2012 at 12:57:37PM +0200, Roland Stigge wrote:
> On 08/31/2012 11:05 AM, Roland Stigge wrote:
> > I tried to port this on top of Sascha's patches for imx53, only for mxc v3 for now, as below.
> > 
> > Unfortunately, I still get:
> > 
> > ...
> > UnCorrectable RS-ECC Error
> > UnCorrectable RS-ECC Error
> > UnCorrectable RS-ECC Error
> > UnCorrectable RS-ECC Error
> > UnCorrectable RS-ECC Error

Have you written the data you are unable to read with this driver?

> > ...
> > 
> > from mxc_nand.c's mxc_nand_correct_data_v2_v3(). Maybe there's still sth. missing in the
> > error correction code?
> 
> With the below incremental fix, it works. :-)
> 
> Thanks,
> 
> Roland
> 
> PS: Will you prepare a patch for l2-mtd.git? I only have an imx53, can't test the v1/v2 etc.
> configs.
> 
> 
> --- linux-2.6.orig/drivers/mtd/nand/mxc_nand.c
> +++ linux-2.6/drivers/mtd/nand/mxc_nand.c
> @@ -1141,14 +1141,14 @@ static void mxc_nand_command(struct mtd_
>                 host->devtype_data->send_cmd(host, command, true);
>                 mxc_do_addr_cycle(mtd, column, page_addr);
>                 host->devtype_data->send_read_id(host);
> -               host->buf_start = column;
> +               host->buf_start = 0;
>                 break;
>  
>         case NAND_CMD_PARAM:
>                 host->devtype_data->send_cmd(host, command, true);
>                 mxc_do_addr_cycle(mtd, column, page_addr);
>                 host->devtype_data->send_read_param(host);
> -               host->buf_start = column;
> +               host->buf_start = 0;

On what tree are you working? I cannot find a handling of
NAND_CMD_PARAM in my tree.

Sascha

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