Linux-mtd Archive on lore.kernel.org
 help / color / Atom feed
From: Pratyush Yadav <p.yadav@ti.com>
To: Bert Vermeulen <bert@biot.com>
Cc: vigneshr@ti.com, tudor.ambarus@microchip.com, richard@nod.at,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com
Subject: Re: [RESEND PATCH v2] mtd: spi-nor: Fix address width on flash chips > 16MB
Date: Tue, 6 Oct 2020 20:48:07 +0530
Message-ID: <20201006151807.2pckm7ncply7uomc@ti.com> (raw)
In-Reply-To: <20201006132346.12652-1-bert@biot.com>

On 06/10/20 03:23PM, Bert Vermeulen wrote:
> If a flash chip has more than 16MB capacity but its BFPT reports
> BFPT_DWORD1_ADDRESS_BYTES_3_OR_4, the spi-nor framework defaults to 3.
> 
> The check in spi_nor_set_addr_width() doesn't catch it because addr_width
> did get set. This fixes that check.
> 
> Fixes: f9acd7fa80be ("mtd: spi-nor: sfdp: default to addr_width of 3 for configurable widths")
> Signed-off-by: Bert Vermeulen <bert@biot.com>
> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---
>  drivers/mtd/spi-nor/core.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 0369d98b2d12..a2c35ad9645c 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -3009,13 +3009,15 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
>  		/* already configured from SFDP */
>  	} else if (nor->info->addr_width) {
>  		nor->addr_width = nor->info->addr_width;
> -	} else if (nor->mtd.size > 0x1000000) {
> -		/* enable 4-byte addressing if the device exceeds 16MiB */
> -		nor->addr_width = 4;
>  	} else {
>  		nor->addr_width = 3;
>  	}
>  
> +	if (nor->addr_width == 3 && nor->mtd.size > 0x1000000) {
Nitpick:    ^^^^^^^^^^^^^^^^^^^^^^^^ you can drop this part. But its 
fine either way.

Reviewed-by: Pratyush Yadav <p.yadav@ti.com>

> +		/* enable 4-byte addressing if the device exceeds 16MiB */
> +		nor->addr_width = 4;
> +	}
> +
>  	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
>  		dev_dbg(nor->dev, "address width is too large: %u\n",
>  			nor->addr_width);

-- 
Regards,
Pratyush Yadav
Texas Instruments India

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

  reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-06 13:23 Bert Vermeulen
2020-10-06 15:18 ` Pratyush Yadav [this message]
2020-10-07  7:29   ` Vignesh Raghavendra
2020-10-07  7:48     ` Pratyush Yadav
2020-10-06 15:33 ` Greg KH
2020-10-29  4:46 ` Vignesh Raghavendra

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=20201006151807.2pckm7ncply7uomc@ti.com \
    --to=p.yadav@ti.com \
    --cc=bert@biot.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=miquel.raynal@bootlin.com \
    --cc=richard@nod.at \
    --cc=stable@vger.kernel.org \
    --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