From c03d996900f9d063b47ef7462885a9085c8a587f Mon Sep 17 00:00:00 2001 From: Boris BREZILLON Date: Wed, 2 Dec 2015 12:01:05 +0100 Subject: [PATCH] mtd: nand: add NAND_NEED_SCRAMBLING option flag Some MLC NANDs are sensitive to repeated patterns and require data to be scrambled in order to limit the number of bitflips. Add a new flag to let the NAND controller know about this constraint. Signed-off-by: Boris Brezillon Signed-off-by: Brian Norris --- include/linux/mtd/nand.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index bdd68e22b5a5..a13dfd5bc58b 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -168,6 +168,12 @@ typedef enum { /* Device supports subpage reads */ #define NAND_SUBPAGE_READ 0x00001000 +/* + * Some MLC NANDs need data scrambling to limit bitflips caused by repeated + * patterns. + */ +#define NAND_NEED_SCRAMBLING 0x00002000 + /* Options valid for Samsung large page devices */ #define NAND_SAMSUNG_LP_OPTIONS NAND_CACHEPRG -- 2.20.1