From d0bf37932ac98cc793da2164ac1a4656fbf34bbc Mon Sep 17 00:00:00 2001 From: Matt Reimer Date: Thu, 18 Oct 2007 18:02:43 -0700 Subject: [PATCH] [MTD] [NAND] fix s3c2410 error correction The single-bit error correction was, well, incorrect. For determing which bit to correct it was using P1' P2' P4' P8' instead of P1 P2 P4 P8, and it was using P16' P32' P64' P128' P256' P512' P1024' P2048' instead of P16 P32 P64 P128 P256 P512 P1024 P2048. Signed-off-by: Matt Reimer Signed-off-by: David Woodhouse --- drivers/mtd/nand/s3c2410.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 21a2cc8636d..d31cb7b3fee 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -366,23 +366,21 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) { /* calculate the bit position of the error */ - bit = (diff2 >> 2) & 1; - bit |= (diff2 >> 3) & 2; - bit |= (diff2 >> 4) & 4; + bit = ((diff2 >> 3) & 1) | + ((diff2 >> 4) & 2) | + ((diff2 >> 5) & 4); /* calculate the byte position of the error */ - byte = (diff1 << 1) & 0x80; - byte |= (diff1 << 2) & 0x40; - byte |= (diff1 << 3) & 0x20; - byte |= (diff1 << 4) & 0x10; - - byte |= (diff0 >> 3) & 0x08; - byte |= (diff0 >> 2) & 0x04; - byte |= (diff0 >> 1) & 0x02; - byte |= (diff0 >> 0) & 0x01; - - byte |= (diff2 << 8) & 0x100; + byte = ((diff2 << 7) & 0x100) | + ((diff1 << 0) & 0x80) | + ((diff1 << 1) & 0x40) | + ((diff1 << 2) & 0x20) | + ((diff1 << 3) & 0x10) | + ((diff0 >> 4) & 0x08) | + ((diff0 >> 3) & 0x04) | + ((diff0 >> 2) & 0x02) | + ((diff0 >> 1) & 0x01); dev_dbg(info->device, "correcting error bit %d, byte %d\n", bit, byte); -- 2.41.1