mtd: nand: raw: atmel: Respect tAR, tCLR in read setup timing

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Having setup time 0 violates tAR, tCLR of some chips, for instance
TOSHIBA TC58NVG2S3ETAI0 cannot be detected successfully (first ID byte
being read duplicated, i.e. 98 98 dc 90 15 76 14 03 instead of
98 dc 90 15 76 ...).

Atmel Application Notes postulated 1 cycle NRD_SETUP without explanation
[1], but it looks more appropriate to just calculate setup time properly.

[1] Link: https://ww1.microchip.com/downloads/aemDocuments/documents/MPU32/ApplicationNotes/ApplicationNotes/doc6255.pdf

Cc: stable@vger.kernel.org
Fixes: f9ce2eddf1 ("mtd: nand: atmel: Add ->setup_data_interface() hooks")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Tested-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

...

This commit is contained in:

Alexander Sverdlin 2025-08-21 14:00:57 +02:00 • committed by Miquel Raynal

parent 811c0da454

commit fd779eac2d

1 changed files with 13 additions and 3 deletions

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drivers/mtd/nand/raw/atmel/nand-controller.c

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