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mtd: nand: add NAND_NEED_SCRAMBLING option flag

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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 <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Boris BREZILLON 2015-12-02 12:01:05 +01:00 committed by Brian Norris
parent 23819f2eaa
commit c03d996900
1 changed files with 6 additions and 0 deletions
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6
include/linux/mtd/nand.h
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@ -168,6 +168,12 @@ typedef enum {
/* Device supports subpage reads */ /* Device supports subpage reads */
#define NAND_SUBPAGE_READ 0x00001000 #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 */ /* Options valid for Samsung large page devices */
#define NAND_SAMSUNG_LP_OPTIONS NAND_CACHEPRG #define NAND_SAMSUNG_LP_OPTIONS NAND_CACHEPRG