On Sat, Mar 30, 2024 at 02:49:56PM +0100, Hauke Mehrtens wrote:

Hi,

Please backport the following commit back to the Linux stable kernels 6.6, 6.7 and 6.8:

commit 34a956739d295de6010cdaafeed698ccbba87ea4 Author: Ezra Buehler ezra.buehler@husqvarnagroup.com Date: Thu Jan 25 22:01:07 2024 +0200

mtd: spinand: Add support for 5-byte IDs

E.g. ESMT chips will return an identification code with a length of 5
bytes. In order to prevent ambiguity, flash chips would actually need to
return IDs that are up to 17 or more bytes long due to JEDEC's
continuation scheme. I understand that if a manufacturer ID is located
in bank N of JEDEC's database (there are currently 16 banks), N - 1
continuation codes (7Fh) need to be added to the identification code
(comprising of manufacturer ID and device ID). However, most flash chip
manufacturers don't seem to implement this (correctly).

Signed-off-by: Ezra Buehler <ezra.buehler@husqvarnagroup.com>
Reviewed-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
Tested-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link:

https://lore.kernel.org/linux-mtd/20240125200108.24374-2-ezra@easyb.ch

This will fix a regression introduced between Linux kernel 6.6.22 and 6.6.23 in OpenWrt. The esmt NAND flash is not detected any more: <3>[ 0.885607] spi-nand spi0.0: unknown raw ID c8017f7f <4>[ 0.890852] spi-nand: probe of spi0.0 failed with error -524 See: https://github.com/openwrt/openwrt/pull/14992

The following commit was backported to 6.6.22, but the commit it depends on was not backported. commit 4bd14b2fd8a83a2f5220ba4ef323f741e11bfdfd Author: Ezra Buehler ezra.buehler@husqvarnagroup.com Date: Thu Jan 25 22:01:08 2024 +0200

mtd: spinand: esmt: Extend IDs to 5 bytes

Now queued up, thanks.

greg k-h