mtd: s3c2410_nand: Add config option to disable hw ecc at runtime
authorHolger Freyther <zecke@openmoko.org>
Wed, 19 Nov 2008 17:10:51 +0000 (17:10 +0000)
committerLars-Peter Clausen <lars@metafoo.de>
Mon, 17 May 2010 17:49:33 +0000 (19:49 +0200)
This patch adds a flag to the s3c2410_nand platform data, which configures
whether hardware ecc is used for that chip.

Currently hardware ecc is used if it was compiled into the kernel. But if you
want to build a kernel which runs on multiple devices you might have a
configuration where you have devices which require hw ecc as well as devices
which want software ecc.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
arch/arm/plat-samsung/include/plat/nand.h
drivers/mtd/nand/s3c2410.c

index b64115f..cbdc8f0 100644 (file)
@@ -49,6 +49,7 @@ struct s3c2410_platform_nand {
        int     twrph1; /* time for release CLE/ALE from nWE/nOE inactive */
 
        unsigned int    ignore_unset_ecc:1;
+       unsigned int    software_ecc:1; /* force software ecc at runtime */
 
        int                     nr_sets;
        struct s3c2410_nand_set *sets;
index fa6e9c7..ec4ac09 100644 (file)
@@ -816,7 +816,7 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
        nmtd->mtd.owner    = THIS_MODULE;
        nmtd->set          = set;
 
-       if (hardware_ecc) {
+       if (!(info->platform && info->platform->software_ecc) && hardware_ecc) {
                chip->ecc.calculate = s3c2410_nand_calculate_ecc;
                chip->ecc.correct   = s3c2410_nand_correct_data;
                chip->ecc.mode      = NAND_ECC_HW;