This is a note to let you know that I've just added the patch titled
mtd: spinand: Add support for 5-byte IDs
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-spinand-add-support-for-5-byte-ids.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 34a956739d295de6010cdaafeed698ccbba87ea4 Mon Sep 17 00:00:00 2001
From: Ezra Buehler <ezra.buehler@xxxxxxxxxxxxxxxxxx>
Date: Thu, 25 Jan 2024 22:01:07 +0200
Subject: mtd: spinand: Add support for 5-byte IDs
From: Ezra Buehler <ezra.buehler@xxxxxxxxxxxxxxxxxx>
commit 34a956739d295de6010cdaafeed698ccbba87ea4 upstream.
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@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Martin Kurbanov <mmkurbanov@xxxxxxxxxxxxxxxxx>
Tested-by: Martin Kurbanov <mmkurbanov@xxxxxxxxxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20240125200108.24374-2-ezra@xxxxxxxx
Cc: Hauke Mehrtens <hauke@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/mtd/spinand.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -169,7 +169,7 @@
struct spinand_op;
struct spinand_device;
-#define SPINAND_MAX_ID_LEN 4
+#define SPINAND_MAX_ID_LEN 5
/*
* For erase, write and read operation, we got the following timings :
* tBERS (erase) 1ms to 4ms
Patches currently in stable-queue which might be from ezra.buehler@xxxxxxxxxxxxxxxxxx are
queue-6.6/mtd-spinand-add-support-for-5-byte-ids.patch
