| From b0f8e6925bba986ad914bf35364b969fd13dc275 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Thu, 10 Jun 2021 16:39:45 +0200 |
| Subject: dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation |
| |
| From: Miquel Raynal <miquel.raynal@bootlin.com> |
| |
| [ 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 | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt |
| index dd559045593d..d2d1bae63a36 100644 |
| --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt |
| +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt |
| @@ -123,7 +123,7 @@ 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 |
| -- |
| 2.30.2 |
| |
