devicetree.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Stefan Peter <s.peter@mpl.ch>
To: Andrew Lunn <andrew@lunn.ch>
Cc: devicetree-discuss@lists.ozlabs.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mtd@lists.infradead.org, grant.likely@secretlab.ca,
	rob.herring@calxeda.com, rob@landley.net, linux@arm.linux.org.uk,
	jason@lakedaemon.net, dwmw2@infradead.org, jm@lentin.co.uk,
	arnd@arndb.de, sebastian.hesselbarth@googlemail.com,
	iwamatsu@nigauri.org, artem.bityutskiy@linux.intel.com,
	wfp5p@virginia.edu, gregkh@linuxfoundation.org,
	broonie@opensource.wolfsonmicro.com, mchehab@redhat.com,
	nico@linaro.org
Subject: Re: [PATCH 3/4] Enable ecc-mode selection in the driver
Date: Wed, 16 Jan 2013 12:43:57 +0100	[thread overview]
Message-ID: <50F6927D.3070303@mpl.ch> (raw)
In-Reply-To: <20130115125119.GH13482@lunn.ch>

Hi Andrew

on 15.01.2013 13:51, Andrew Lunn wrote:
> On Tue, Jan 15, 2013 at 01:13:12PM +0100, Stefan Peter wrote:
>> In order to be able to use the ecc-mode, add the bch module to the default
>> settings for the kirwood boards and enable the activation in orin-nand.c
>>
>> Signed-off-by: Stefan Peter <s.peter@mpl.ch>
>> ---
>> diff --git a/arch/arm/configs/kirkwood_defconfig b/arch/arm/configs/kirkwood_defconfig
>> index 93f3794..4a9d3f7 100644
>> --- a/arch/arm/configs/kirkwood_defconfig
>> +++ b/arch/arm/configs/kirkwood_defconfig
>> @@ -84,6 +84,7 @@ CONFIG_MTD_CFI_STAA=y
>>  CONFIG_MTD_PHYSMAP=y
>>  CONFIG_MTD_M25P80=y
>>  CONFIG_MTD_NAND=y
>> +CONFIG_MTD_NAND_ECC_BCH=y
>>  CONFIG_MTD_NAND_ORION=y
>>  CONFIG_BLK_DEV_LOOP=y
>>  # CONFIG_SCSI_PROC_FS is not set
>> diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
>> index cd72b92..1a35257 100644
>> --- a/drivers/mtd/nand/orion_nand.c
>> +++ b/drivers/mtd/nand/orion_nand.c
>> @@ -14,6 +14,7 @@
>>  #include <linux/module.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/of.h>
>> +#include <linux/of_mtd.h>
>>  #include <linux/mtd/mtd.h>
>>  #include <linux/mtd/nand.h>
>>  #include <linux/mtd/partitions.h>
>> @@ -130,6 +131,7 @@ static int __init orion_nand_probe(struct platform_device *pdev)
>>  		if (!of_property_read_u32(pdev->dev.of_node,
>>  						"chip-delay", &val))
>>  			board->chip_delay = (u8)val;
>> +		board->ecc_mode = of_get_nand_ecc_mode(pdev->dev.of_node);
> 
>>  	} else
>>  		board = pdev->dev.platform_data;
>>  
>> @@ -140,7 +142,8 @@ static int __init orion_nand_probe(struct platform_device *pdev)
>>  	nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
>>  	nc->cmd_ctrl = orion_nand_cmd_ctrl;
>>  	nc->read_buf = orion_nand_read_buf;
>> -	nc->ecc.mode = NAND_ECC_SOFT;
>> +	nc->ecc.mode = board->ecc_mode == NAND_ECC_SOFT_BCH ?
>> +		NAND_ECC_SOFT_BCH : NAND_ECC_SOFT;
> 
> Hi Stefan
> 
> What about a user that wants one of the other valid values?
> NAND_ECC_OOB_FIRST, NAND_ECC_HW_SYNDROME, etc.

As far as I understand, NAND_ECC_NONE, NAND_ECC_SOFT and
NAND_ECC_SOFT_BCH are the only ECC modes that do not require
corresponding hardware support which is missing in the marvell
88F6180/88F619x/88F628x. From my point of view, NAND_ECC_NONE does not
make sense, too, because MLC NAND Flash requires ECC to be usable.

> 
> Would:
> 
> 	if (IS_ERR(board->ecc_mode)) {
> 		nc->ecc.mode = NAND_ECC_SOFT;
> 		dev_info(&pdev->dev, "Defaulting to NAND_ECC_SOFT");
> 	} else
> 		nc->ecc.mode = board->ecc_mode
> 
> be better?

I feel safer by limiting the modes to what I could test.

Regards

Stefan Peter


-- 
MPL AG, Switzerland                     http://www.mpl.ch
Tel. +41 (0)56 483 34 34          Fax: +41(0)56 493 30 20

  reply	other threads:[~2013-01-16 11:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1358242644.git.s.peter@mpl.ch>
     [not found] ` <2d08c4c072fd4922a6056362adb96a455307d583.1358242644.git.s.peter@mpl.ch>
     [not found]   ` <2d08c4c072fd4922a6056362adb96a455307d583.1358242644.git.s.peter-R0yVo0h44Ow@public.gmane.org>
2013-01-15 12:33     ` [PATCH 3/4] Enable ecc-mode selection in the driver Jason Cooper
     [not found]       ` <20130115123307.GA13433-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2013-01-16 11:44         ` Stefan Peter
2013-01-15 12:51     ` Andrew Lunn
2013-01-16 11:43       ` Stefan Peter [this message]
2013-01-16 13:24         ` Andrew Lunn
2013-01-18  7:27         ` Artem Bityutskiy

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=50F6927D.3070303@mpl.ch \
    --to=s.peter@mpl.ch \
    --cc=andrew@lunn.ch \
    --cc=arnd@arndb.de \
    --cc=artem.bityutskiy@linux.intel.com \
    --cc=broonie@opensource.wolfsonmicro.com \
    --cc=devicetree-discuss@lists.ozlabs.org \
    --cc=dwmw2@infradead.org \
    --cc=grant.likely@secretlab.ca \
    --cc=gregkh@linuxfoundation.org \
    --cc=iwamatsu@nigauri.org \
    --cc=jason@lakedaemon.net \
    --cc=jm@lentin.co.uk \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=linux@arm.linux.org.uk \
    --cc=mchehab@redhat.com \
    --cc=nico@linaro.org \
    --cc=rob.herring@calxeda.com \
    --cc=rob@landley.net \
    --cc=sebastian.hesselbarth@googlemail.com \
    --cc=wfp5p@virginia.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).