From ba78ee00e1ff84de9b3ad33edbd3ec599099ee82 Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Wed, 8 Jun 2016 17:04:22 +0200 Subject: [PATCH] mtd: nand: Add an option to maximize the ECC strength 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 Acked-by: Rob Herring --- Documentation/devicetree/bindings/mtd/nand.txt | 9 +++++++++ drivers/mtd/nand/nand_base.c | 3 +++ include/linux/mtd/nand.h | 1 + 3 files changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/nand.txt b/Documentation/devicetree/bindings/mtd/nand.txt index 3733300..b056016 100644 --- a/Documentation/devicetree/bindings/mtd/nand.txt +++ b/Documentation/devicetree/bindings/mtd/nand.txt @@ -35,6 +35,15 @@ Optional NAND chip properties: - nand-ecc-step-size: integer representing the number of data bytes that are covered by a single ECC step. +- nand-ecc-maximize: boolean used to specify that you want to maximize ECC + strength. The maximum ECC strength is both controller and + chip dependent. The controller side has to select the ECC + config providing the best strength and taking the OOB area + size constraint into account. + This is particularly useful when only the in-band area is + used by the upper layers, and you want to make your NAND + as reliable as possible. + The ECC strength and ECC step size properties define the correction capability of a controller. Together, they say a controller can correct "{strength} bit errors per {size} bytes". diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index f39775b..6669dfc 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -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; } diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index d3e3f8d..331caf9 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -141,6 +141,7 @@ enum nand_ecc_algo { * pages and you want to rely on the default implementation. */ #define NAND_ECC_GENERIC_ERASED_CHECK BIT(0) +#define NAND_ECC_MAXIMIZE BIT(1) /* Bit mask for flags passed to do_nand_read_ecc */ #define NAND_GET_DEVICE 0x80 -- 2.7.4