Re: [PATCH v2] mtd: rawnand: Ensure the nand chip supports cached reads

Miquel Raynal
2023-10-16T09:27:12Z

On Fri, 2023-09-22 at 14:17:16 UTC, Rouven Czerwinski wrote:
> Both the JEDEC and ONFI specification say that read cache sequential
> support is an optional command. This means that we not only need to
> check whether the individual controller supports the command, we also
> need to check the parameter pages for both ONFI and JEDEC NAND flashes
> before enabling sequential cache reads.
>
> This fixes support for NAND flashes which don't support enabling cache
> reads, i.e. Samsung K9F4G08U0F or Toshiba TC58NVG0S3HTA00.
>
> Sequential cache reads are now only available for ONFI and JEDEC
> devices, if individual vendors implement this, it needs to be enabled
> per vendor.
>
> Tested on i.MX6Q with a Samsung NAND flash chip that doesn't support
> sequential reads.
>
> Fixes: 003fe4b9545b ("mtd: rawnand: Support for sequential cache reads")
> Cc: stable@vger.kernel.org
> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes, thanks.

Miquel