dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation
authorMiquel Raynal <miquel.raynal@bootlin.com>
Thu, 10 Jun 2021 14:39:45 +0000 (16:39 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 22 Sep 2021 10:26:43 +0000 (12:26 +0200)
[ Upstream commit 778cb8e39f6ec252be50fc3850d66f3dcbd5dd5a ]

"PAGESIZE / 512" is the number of ECC chunks.
"ECC_BYTES" is the number of bytes needed to store a single ECC code.
"2" is the space reserved by the bad block marker.

"2 + (PAGESIZE / 512) * ECC_BYTES" should of course be lower or equal
than the total number of OOB bytes, otherwise it won't fit.

Fix the equation by substituting s/>=/<=/.

Suggested-by: Ryan J. Barnett <ryan.barnett@collins.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20210610143945.3504781-1-miquel.raynal@bootlin.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Documentation/devicetree/bindings/mtd/gpmc-nand.txt

index 44919d48d2415c4fadc80dd5ed02e291b7dcc640..c459f169a9044a91c919e8eb96c0776aa9acbd88 100644 (file)
@@ -122,7 +122,7 @@ on various other factors also like;
        so the device should have enough free bytes available its OOB/Spare
        area to accommodate ECC for entire page. In general following expression
        helps in determining if given device can accommodate ECC syndrome:
-       "2 + (PAGESIZE / 512) * ECC_BYTES" >= OOBSIZE"
+       "2 + (PAGESIZE / 512) * ECC_BYTES" <= OOBSIZE"
        where
                OOBSIZE         number of bytes in OOB/spare area
                PAGESIZE        number of bytes in main-area of device page