Commit c03d9969 authored Dec 02, 2015 by Boris Brezillon Committed by Brian Norris Jan 22, 2016

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 <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

parent 23819f2e

include/linux/mtd/nand.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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