[PATCH v1] mtd: spinand: Add support for 5-byte IDs

[PATCH v1] mtd: spinand: Add support for 5-byte IDs

[Dmitry Rokosov]

From: Ezra Buehler <ezra.buehler@husqvarnagroup.com>

[ Upstream commit 34a956739d295de6010cdaafeed698ccbba87ea4 ]

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).

Cc: <stable@vger.kernel.org> # 6.6.23
Cc: <stable@vger.kernel.org> # 6.7.11
Cc: <stable@vger.kernel.org> # 6.8.2
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
Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
---

In the patch series [1] only one patch was marked with Fixes tag, that's
why the secon patch was not applied to 6.6.y, 6.7.y and 6.8y. It breaks
ESMT detection flow with logs:

[    0.770730] spi-nand spi0.0: unknown raw ID c8017f7f
[    0.772688] spi-nand: probe of spi0.0 failed with error -524

Please cherry-pick the second patch from the series to 6.6.y, 6.7.y and
6.8.y.

Links:
    [1] https://lore.kernel.org/linux-mtd/20240125200108.24374-1-ezra@easyb.ch/

---
 include/linux/mtd/spinand.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index badb4c1ac079..5c19ead60499 100644
--- 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
-- 
2.43.0


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Re: [PATCH v1] mtd: spinand: Add support for 5-byte IDs

[Greg KH]

On Thu, Apr 04, 2024 at 03:15:21PM +0300, Dmitry Rokosov wrote:
> From: Ezra Buehler <ezra.buehler@husqvarnagroup.com>
> 
> [ Upstream commit 34a956739d295de6010cdaafeed698ccbba87ea4 ]

This commit is already in the following releases:
	6.6.24 6.7.12 6.8.3 6.9-rc1

> 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).
> 
> Cc: <stable@vger.kernel.org> # 6.6.23
> Cc: <stable@vger.kernel.org> # 6.7.11
> Cc: <stable@vger.kernel.org> # 6.8.2
> 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
> Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
> ---
> 
> In the patch series [1] only one patch was marked with Fixes tag, that's
> why the secon patch was not applied to 6.6.y, 6.7.y and 6.8y. It breaks
> ESMT detection flow with logs:
> 
> [    0.770730] spi-nand spi0.0: unknown raw ID c8017f7f
> [    0.772688] spi-nand: probe of spi0.0 failed with error -524
> 
> Please cherry-pick the second patch from the series to 6.6.y, 6.7.y and
> 6.8.y.

What commit id is "the second patch" here?  The one referenced above?
If so, again, this is already in a released kernel, so I'm confused as
to what to do here.

thanks,

greg k-h

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Re: [PATCH v1] mtd: spinand: Add support for 5-byte IDs

[Dmitry Rokosov]

On Fri, Apr 05, 2024 at 08:37:48AM +0200, Greg KH wrote:
> On Thu, Apr 04, 2024 at 03:15:21PM +0300, Dmitry Rokosov wrote:
> > From: Ezra Buehler <ezra.buehler@husqvarnagroup.com>
> > 
> > [ Upstream commit 34a956739d295de6010cdaafeed698ccbba87ea4 ]
> 
> This commit is already in the following releases:
> 	6.6.24 6.7.12 6.8.3 6.9-rc1
> 
> > 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).
> > 
> > Cc: <stable@vger.kernel.org> # 6.6.23
> > Cc: <stable@vger.kernel.org> # 6.7.11
> > Cc: <stable@vger.kernel.org> # 6.8.2
> > 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
> > Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
> > ---
> > 
> > In the patch series [1] only one patch was marked with Fixes tag, that's
> > why the secon patch was not applied to 6.6.y, 6.7.y and 6.8y. It breaks
> > ESMT detection flow with logs:
> > 
> > [    0.770730] spi-nand spi0.0: unknown raw ID c8017f7f
> > [    0.772688] spi-nand: probe of spi0.0 failed with error -524
> > 
> > Please cherry-pick the second patch from the series to 6.6.y, 6.7.y and
> > 6.8.y.
> 
> What commit id is "the second patch" here?  The one referenced above?
> If so, again, this is already in a released kernel, so I'm confused as
> to what to do here.

Ah, I apologize for not checking versions 6.8.3 and 6.7.12. My test
environment was running on versions 6.8.2 and 6.7.11. Therefore, the
mistake was on my part. Please disregard the cherry-pick for those
versions, and thank you for quick reply!

-- 
Thank you,
Dmitry

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