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mtd: nand: Add an option to maximize the ECC strength

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The generic NAND DT bindings allows one to tweak the ECC strength and
step size to their need. It can be used to lower the ECC strength to
match a bootloader/firmware config, but might also be used to get a better
reliability.

In the latter case, the user might want to use the maximum ECC strength
without having to explicitly calculate the exact value (this value not
only depends on the OOB size, but also on the NAND controller, and can
be tricky to extract).

Add a generic 'nand-ecc-maximize' DT property and the associated
NAND_ECC_MAXIMIZE flag, to let ECC controller drivers select the best
ECC strength and step-size on their own.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Boris Brezillon
2016-06-08 17:04:22 +02:00
parent 8283079696
commit ba78ee00e1
3 changed files with 13 additions and 0 deletions
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3
drivers/mtd/nand/nand_base.c
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@@ -4272,6 +4272,9 @@ static int nand_dt_init(struct nand_chip *chip)
if (ecc_step > 0)
chip->ecc.size = ecc_step;
if (of_property_read_bool(dn, "nand-ecc-maximize"))
chip->ecc.options |= NAND_ECC_MAXIMIZE;
return 0;
}