Linux-mtd Archive on lore.kernel.org
 help / color / Atom feed
From: Pratyush Yadav <p.yadav@ti.com>
To: Tudor Ambarus <tudor.ambarus@microchip.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	<linux-mtd@lists.infradead.org>, <linux-kernel@vger.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
Date: Tue, 27 Oct 2020 16:48:06 +0530
Message-ID: <20201027111804.e27pyvf62eksngmp@ti.com> (raw)
In-Reply-To: <20201012180404.6476-1-p.yadav@ti.com>

On 12/10/20 11:34PM, Pratyush Yadav wrote:
> Hi,
> 
> The Cypress Semper S28 flash family uses 2-bit ECC by default. Under
> this ECC scheme, multi-pass page programs result in a program error.
> This means that unlike many other SPI NOR flashes, bit-walking cannot be
> done. In other words, once a page is programmed, its bits cannot then be
> flipped to 0 without an erase in between.
> 
> This causes problems with UBIFS because it uses bit-walking to clear EC
> and VID magic numbers from a PEB before issuing an erase to preserve the
> file system correctness in case of power cuts.
> 
> This series fixes that problem by introducing a flag
> MTD_NO_MULTI_PASS_WRITE that tells the file system layer that it can't
> do multi-pass writes. It also sets the writesize to the page size for
> such flashes to make sure file systems know that they should write the
> entire page in one go.
> 
> It is based on the xSPI/8D series that adds support for Cypress S28
> flash [0]. The patches themselves are independent of that series in the
> sense that they don't rely on 8D support. But since S28 flash is not
> supported without that series, these patches don't make much sense
> without it.
> 
> Tested on Cypress S28HS512T and MT35XU512ABA on J7200 and J721E
> respectively.
> 
> [0] https://lore.kernel.org/linux-mtd/20201005153138.6437-1-p.yadav@ti.com/

Ping. Any comments on the series?
 
> Pratyush Yadav (3):
>   mtd: abi: Introduce MTD_NO_MULTI_PASS_WRITE
>   UBI: Do not zero out EC and VID when multi-pass writes are not
>     supported
>   mtd: spi-nor: core: Introduce SPI_NOR_NO_MULTI_PASS_PP
> 
>  drivers/mtd/spi-nor/core.c     | 5 +++++
>  drivers/mtd/spi-nor/core.h     | 6 ++++++
>  drivers/mtd/spi-nor/spansion.c | 2 +-
>  drivers/mtd/ubi/io.c           | 2 +-
>  include/uapi/mtd/mtd-abi.h     | 1 +
>  5 files changed, 14 insertions(+), 2 deletions(-)
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments India

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 18:04 Pratyush Yadav
2020-10-12 18:04 ` [PATCH 1/3] mtd: abi: Introduce MTD_NO_MULTI_PASS_WRITE Pratyush Yadav
2020-10-12 18:04 ` [PATCH 2/3] UBI: Do not zero out EC and VID when multi-pass writes are not supported Pratyush Yadav
2020-11-03 11:48   ` Vignesh Raghavendra
2020-11-03 11:59     ` Richard Weinberger
2020-11-03 12:47       ` Pratyush Yadav
2020-10-12 18:04 ` [PATCH 3/3] mtd: spi-nor: core: Introduce SPI_NOR_NO_MULTI_PASS_PP Pratyush Yadav
2020-10-27 11:18 ` Pratyush Yadav [this message]
2020-10-31 21:44   ` [PATCH 0/3] mtd: Make sure UBIFS does not do multi-pass page programming on flashes that don't support it Richard Weinberger
2020-11-03 11:35     ` Vignesh Raghavendra
2020-11-03 12:45       ` Pratyush Yadav
2020-11-05 12:21         ` Vignesh Raghavendra
2020-11-05 13:19           ` Pratyush Yadav

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=20201027111804.e27pyvf62eksngmp@ti.com \
    --to=p.yadav@ti.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=miquel.raynal@bootlin.com \
    --cc=richard@nod.at \
    --cc=tudor.ambarus@microchip.com \
    --cc=vigneshr@ti.com \
    /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

Linux-mtd Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mtd/0 linux-mtd/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mtd linux-mtd/ https://lore.kernel.org/linux-mtd \
		linux-mtd@lists.infradead.org
	public-inbox-index linux-mtd

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-mtd


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git