From 74f1b7244e502c5a98906a5dcc5ec389aacd25e6 Mon Sep 17 00:00:00 2001 From: John Ogness Date: Mon, 28 Feb 2011 13:12:46 +0100 Subject: mtd: omap3: nand: report corrected ecc errors The number of corrected ECC errors should be reported since other MTD systems make use of this information (such as UBI data scrubbing). Signed-off-by: John Ogness Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/nand/omap2.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index 28af71c61834..d7a4e2550b13 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -517,6 +517,8 @@ static void gen_true_ecc(u8 *ecc_buf) * * This function compares two ECC's and indicates if there is an error. * If the error can be corrected it will be corrected to the buffer. + * If there is no error, %0 is returned. If there is an error but it + * was corrected, %1 is returned. Otherwise, %-1 is returned. */ static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ u8 *ecc_data2, /* read from register */ @@ -622,7 +624,7 @@ static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ page_data[find_byte] ^= (1 << find_bit); - return 0; + return 1; default: if (isEccFF) { if (ecc_data2[0] == 0 && @@ -643,8 +645,11 @@ static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ * @calc_ecc: ecc read from HW ECC registers * * Compares the ecc read from nand spare area with ECC registers values - * and if ECC's mismached, it will call 'omap_compare_ecc' for error detection - * and correction. + * and if ECC's mismatched, it will call 'omap_compare_ecc' for error + * detection and correction. If there are no errors, %0 is returned. If + * there were errors and all of the errors were corrected, the number of + * corrected errors is returned. If uncorrectable errors exist, %-1 is + * returned. */ static int omap_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc) @@ -652,6 +657,7 @@ static int omap_correct_data(struct mtd_info *mtd, u_char *dat, struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, mtd); int blockCnt = 0, i = 0, ret = 0; + int stat = 0; /* Ex NAND_ECC_HW12_2048 */ if ((info->nand.ecc.mode == NAND_ECC_HW) && @@ -665,12 +671,14 @@ static int omap_correct_data(struct mtd_info *mtd, u_char *dat, ret = omap_compare_ecc(read_ecc, calc_ecc, dat); if (ret < 0) return ret; + /* keep track of the number of corrected errors */ + stat += ret; } read_ecc += 3; calc_ecc += 3; dat += 512; } - return 0; + return stat; } /** -- cgit v1.2.3