LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Abhishek Sahu <absahu@codeaurora.org>
To: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: Archit Taneja <architt@codeaurora.org>,
	Richard Weinberger <richard@nod.at>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Marek Vasut <marek.vasut@gmail.com>,
	linux-mtd@lists.infradead.org,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Andy Gross <andy.gross@linaro.org>,
	Brian Norris <computersforpeace@gmail.com>,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v2 01/14] mtd: rawnand: helper function for setting up ECC parameters
Date: Tue, 08 May 2018 12:52:29 +0530	[thread overview]
Message-ID: <f7d161689217a8310ee34619b0dd5181@codeaurora.org> (raw)
In-Reply-To: <20180507101646.3df649b0@bbrezillon>

On 2018-05-07 13:46, Boris Brezillon wrote:
> On Thu,  3 May 2018 17:50:28 +0530
> Abhishek Sahu <absahu@codeaurora.org> wrote:
> 
>> commit 2c8f8afa7f92 ("mtd: nand: add generic helpers to check,
>> match, maximize ECC settings") provides generic helpers which
>> drivers can use for setting up ECC parameters.
>> 
>> Since same board can have different ECC strength nand chips so
>> following is the logic for setting up ECC strength and ECC step
>> size, which can be used by most of the drivers.
>> 
>> 1. If both ECC step size and ECC strength are already set
>>    (usually by DT) then just check whether this setting
>>    is supported by NAND controller.
>> 2. If NAND_ECC_MAXIMIZE is set, then select maximum ECC strength
>>    supported by NAND controller.
>> 3. Otherwise, try to match the ECC step size and ECC strength closest
>>    to the chip's requirement. If available OOB size can't fit the chip
>>    requirement then select maximum ECC strength which can be fit with
>>    available OOB size with warning.
>> 
>> This patch introduces nand_ecc_param_setup function which calls the
>> required helper functions for the above logic. The drivers can use
>> this single function instead of calling the 3 helper functions
>> individually.
>> 
>> CC: Masahiro Yamada <yamada.masahiro@socionext.com>
>> Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
>> ---
>> * Changes from v1:
>> 
>>   NEW PATCH
>> 
>>  drivers/mtd/nand/raw/nand_base.c | 42 
>> ++++++++++++++++++++++++++++++++++++++++
>>  include/linux/mtd/rawnand.h      |  3 +++
>>  2 files changed, 45 insertions(+)
>> 
>> diff --git a/drivers/mtd/nand/raw/nand_base.c 
>> b/drivers/mtd/nand/raw/nand_base.c
>> index 72f3a89..dd7a984 100644
>> --- a/drivers/mtd/nand/raw/nand_base.c
>> +++ b/drivers/mtd/nand/raw/nand_base.c
>> @@ -6249,6 +6249,48 @@ int nand_maximize_ecc(struct nand_chip *chip,
>>  }
>>  EXPORT_SYMBOL_GPL(nand_maximize_ecc);
>> 
>> +/**
>> + * nand_ecc_param_setup - Set the ECC strength and ECC step size
>> + * @chip: nand chip info structure
>> + * @caps: ECC engine caps info structure
>> + * @oobavail: OOB size that the ECC engine can use
>> + *
>> + * Choose the ECC strength according to following logic
>> + *
>> + * 1. If both ECC step size and ECC strength are already set (usually 
>> by DT)
>> + *    then check if it is supported by this controller.
>> + * 2. If NAND_ECC_MAXIMIZE is set, then select maximum ECC strength.
>> + * 3. Otherwise, try to match the ECC step size and ECC strength 
>> closest
>> + *    to the chip's requirement. If available OOB size can't fit the 
>> chip
>> + *    requirement then fallback to the maximum ECC step size and ECC 
>> strength
>> + *    and print the warning.
>> + *
>> + * On success, the chosen ECC settings are set.
>> + */
>> +int nand_ecc_param_setup(struct nand_chip *chip,
>> +			 const struct nand_ecc_caps *caps, int oobavail)
> 
> Can we rename this function "nand_ecc_choose_conf()".

  Thanks Boris.
  I will rename this function.

  Regards,
  Abhishek

  reply	other threads:[~2018-05-08  7:22 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-03 12:20 [PATCH v2 00/14] Update for QCOM NAND driver Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 01/14] mtd: rawnand: helper function for setting up ECC parameters Abhishek Sahu
2018-05-07  3:40   ` Masahiro Yamada
2018-05-07  6:01     ` Abhishek Sahu
2018-05-07  7:39     ` Boris Brezillon
2018-05-08  6:14       ` Masahiro Yamada
2018-05-08  7:21         ` Abhishek Sahu
2018-05-07  8:16   ` Boris Brezillon
2018-05-08  7:22     ` Abhishek Sahu [this message]
2018-05-03 12:20 ` [PATCH v2 02/14] mtd: rawnand: denali: use helper function for ecc setup Abhishek Sahu
2018-05-21 14:30   ` Miquel Raynal
2018-05-22 14:09     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 03/14] dt-bindings: qcom_nandc: make nand-ecc-strength optional Abhishek Sahu
2018-05-07  8:40   ` Boris Brezillon
2018-05-21 14:32   ` Miquel Raynal
2018-05-22 14:08     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 04/14] mtd: rawnand: qcom: use the ecc strength from device parameter Abhishek Sahu
2018-05-07  8:28   ` Boris Brezillon
2018-05-08  7:26     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 05/14] mtd: rawnand: qcom: wait for desc completion in all BAM channels Abhishek Sahu
2018-05-22  6:47   ` Miquel Raynal
2018-05-22 14:07     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 06/14] mtd: rawnand: qcom: erased page detection for uncorrectable errors only Abhishek Sahu
2018-05-22  7:04   ` Miquel Raynal
2018-05-22 14:10     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 07/14] mtd: rawnand: qcom: fix null pointer access for erased page detection Abhishek Sahu
2018-05-22  7:16   ` Miquel Raynal
2018-05-22 14:11     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 08/14] mtd: rawnand: qcom: parse read errors for read oob also Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 09/14] mtd: rawnand: qcom: modify write_oob to remove read codeword part Abhishek Sahu
2018-05-22 10:02   ` Miquel Raynal
2018-05-22 14:14     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 10/14] mtd: rawnand: qcom: fix return value for raw page read Abhishek Sahu
2018-05-22 12:04   ` Miquel Raynal
2018-05-22 14:15     ` Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 11/14] mtd: rawnand: qcom: minor code reorganization for bad block check Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 12/14] mtd: rawnand: qcom: check for operation errors in case of raw read Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 13/14] mtd: rawnand: qcom: helper function for " Abhishek Sahu
2018-05-03 12:20 ` [PATCH v2 14/14] mtd: rawnand: qcom: erased page bitflips detection Abhishek Sahu

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=f7d161689217a8310ee34619b0dd5181@codeaurora.org \
    --to=absahu@codeaurora.org \
    --cc=andy.gross@linaro.org \
    --cc=architt@codeaurora.org \
    --cc=boris.brezillon@bootlin.com \
    --cc=computersforpeace@gmail.com \
    --cc=dwmw2@infradead.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=marek.vasut@gmail.com \
    --cc=miquel.raynal@bootlin.com \
    --cc=richard@nod.at \
    --cc=yamada.masahiro@socionext.com \
    --subject='Re: [PATCH v2 01/14] mtd: rawnand: helper function for setting up ECC parameters' \
    /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

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).