linux-kernel - Re: [PATCH 0/3] mtd: Make sure UBIFS does not do multi-pass page programming on flashes that don't support it

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Date:   Tue, 3 Nov 2020 17:05:01 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Richard Weinberger <richard.weinberger@...il.com>,
        Pratyush Yadav <p.yadav@...com>
CC:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] mtd: Make sure UBIFS does not do multi-pass page
 programming on flashes that don't support it



On 11/1/20 3:14 AM, Richard Weinberger wrote:
> On Tue, Oct 27, 2020 at 12:24 PM Pratyush Yadav <p.yadav@...com> wrote:
>>> [0] https://lore.kernel.org/linux-mtd/20201005153138.6437-1-p.yadav@ti.com/
>>
>> Ping. Any comments on the series?
> 
> From the UBIFS point of view I'd like to avoid as many device specific
> settings as possible.
> We check already for NOR flash, checking for NOR *and* SPI_NOR_NO_MULTI_PASS_PP
> feels a bit clumsy.
> 
> Tudor, what do you think about SPI_NOR_NO_MULTI_PASS_PP?
> This kind of NOR seems to be a little NAND'ish. Maybe we can hide this detail
> in the mtd framework?
> 

Agree with Richard. I don't see need for SPI_NOR_NO_MULTI_PASS_PP. From
MTD point of view setting mtd->writesize to be equal to pagesize should
be enough. Its upto clients of MTD devices to ensure there is no multi
pass programming within a "writesize" block.

If this is not clear in the current documentation of struct mtd, then
that can be updated.

Regards
Vignesh