diff --git a/drivers/mtd/nand/raw/pxa3xx_nand.c b/drivers/mtd/nand/raw/pxa3xx_nand.c index 454597355b..492485b1d0 100644 --- a/drivers/mtd/nand/raw/pxa3xx_nand.c +++ b/drivers/mtd/nand/raw/pxa3xx_nand.c @@ -1237,6 +1237,7 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd, { struct pxa3xx_nand_host *host = nand_get_controller_data(chip); struct pxa3xx_nand_info *info = host->info_data; + int bf; chip->read_buf(mtd, buf, mtd->writesize); chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); @@ -1244,12 +1245,30 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd, if (info->retcode == ERR_CORERR && info->use_ecc) { mtd->ecc_stats.corrected += info->ecc_err_cnt; - } else if (info->retcode == ERR_UNCORERR) { + } else if (info->retcode == ERR_UNCORERR && info->ecc_bch) { /* - * for blank page (all 0xff), HW will calculate its ECC as - * 0, which is different from the ECC information within - * OOB, ignore such uncorrectable errors + * Empty pages will trigger uncorrectable errors. Re-read the + * entire page in raw mode and check for bits not being "1". + * If there are more than the supported strength, then it means + * this is an actual uncorrectable error. */ + chip->ecc.read_page_raw(mtd, chip, buf, oob_required, page); + bf = nand_check_erased_ecc_chunk(buf, mtd->writesize, + chip->oob_poi, mtd->oobsize, + NULL, 0, chip->ecc.strength); + if (bf < 0) { + mtd->ecc_stats.failed++; + } else if (bf) { + mtd->ecc_stats.corrected += bf; + info->max_bitflips = max_t(unsigned int, + info->max_bitflips, bf); + info->retcode = ERR_CORERR; + } else { + info->retcode = ERR_NONE; + } + + } else if (info->retcode == ERR_UNCORERR && !info->ecc_bch) { + /* Raw read is not supported with Hamming ECC engine */ if (is_buf_blank(buf, mtd->writesize)) info->retcode = ERR_NONE; else