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authorBoris BREZILLON <boris.brezillon@free-electrons.com>2015-12-02 12:01:05 +0100
committerBrian Norris <computersforpeace@gmail.com>2016-01-22 16:36:54 -0800
commitc03d996900f9d063b47ef7462885a9085c8a587f (patch)
treed6cc081404a5c39c9bef567940631f2763f8f11b
parent23819f2eaab87080b0190ed94a0728fc8ea84711 (diff)
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>
-rw-r--r--include/linux/mtd/nand.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index bdd68e2..a13dfd5 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