linux-kernel - Re: [RFC] NAND: Optimize NAND_ECC_HW_OOB

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Date:   Mon, 30 Oct 2017 18:17:50 +0530
From:   PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vašut <marek.vasut@...il.com>,
        cyrille.pitchen@...ev4u.fr, linux-mtd@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [RFC] NAND: Optimize NAND_ECC_HW_OOB_FIRST read

Hi Boris,

On 30 October 2017 at 14:04, Boris Brezillon
<boris.brezillon@...e-electrons.com> wrote:
> Hi PrasannaKumar,
>
> On Sat, 28 Oct 2017 13:13:51 +0530
> PrasannaKumar Muralidharan <prasannatsmkumar@...il.com> wrote:
>
>> From: Lars-Peter Clausen <lars@...afoo.de>
>>
>> Avoid sending unnecessary READ commands to the chip.
>>
>> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
>> Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
>> ---
>> This patch is taken from git://projects.qi-hardware.com/qi-kernel.git
>> branch jz-3.16. From [1] and [2] it can be seen that the patch author
>> thinks this can be sent upstream but it never happened so far. This
>> patch is used in OpenWRT as seen from [3].
>
> Sounds reasonable, but it's likely to conflict with something I'd like
> to queue for 4.16 [1]. I'll rebase this patch on nand/next once the
> ->exec_op() series is merged. Don't hesitate to ping me if I forget.
>
> Regards,
>
> Boris
>
> [1]http://patchwork.ozlabs.org/project/linux-mtd/list/?series=8923

Okay. I will remind you if required.

There is another patch used in OpenWRT at [1]. Do you mind to have a
look at it and take that if it is useful? I don't see a point in me
sending it as a RFC as I am not contributing anything to it other than
noticing its existence.

1. https://git.lede-project.org/?p=source.git;a=blob;f=target/linux/xburst/patches-3.18/003-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch;h=974eb7a5db9a09347fa6137461f030575f9a4328;hb=c03d4317a6bc891cb4a5e89cbdd77f37c23aff86

Thanks,
PrasannaKumar