mtd: flash drivers set ecc strength

Flash device drivers initialize 'ecc_strength' in struct mtd_info, which is the
maximum number of bit errors that can be corrected in one writesize region.

Drivers using the nand interface intitialize 'strength' in struct nand_ecc_ctrl,
which is the maximum number of bit errors that can be corrected in one ecc step.
Nand infrastructure code translates this to 'ecc_strength'.

Also for nand drivers, the nand infrastructure code sets ecc.strength for ecc
modes NAND_ECC_SOFT, NAND_ECC_SOFT_BCH, and NAND_ECC_NONE.  It is set in the
driver for all other modes.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/devices/doc2000.c b/drivers/mtd/devices/doc2000.c
index 7ad7b05..a4eb8b5 100644 (file)
--- a/drivers/mtd/devices/doc2000.c
+++ b/drivers/mtd/devices/doc2000.c
@@ -564,6 +564,7 @@ void DoC2k_init(struct mtd_info *mtd)
        mtd->flags = MTD_CAP_NANDFLASH;
        mtd->writebufsize = mtd->writesize = 512;
        mtd->oobsize = 16;
+       mtd->ecc_strength = 2;
        mtd->owner = THIS_MODULE;
        mtd->_erase = doc_erase;
        mtd->_read = doc_read;

diff --git a/drivers/mtd/devices/doc2001.c b/drivers/mtd/devices/doc2001.c
index 7bff54e..f692795 100644 (file)
--- a/drivers/mtd/devices/doc2001.c
+++ b/drivers/mtd/devices/doc2001.c
@@ -348,6 +348,7 @@ void DoCMil_init(struct mtd_info *mtd)
        mtd->erasesize = 0x2000;
        mtd->writebufsize = mtd->writesize = 512;
        mtd->oobsize = 16;
+       mtd->ecc_strength = 2;
        mtd->owner = THIS_MODULE;
        mtd->_erase = doc_erase;
        mtd->_read = doc_read;

diff --git a/drivers/mtd/devices/doc2001plus.c b/drivers/mtd/devices/doc2001plus.c
index 4a03d86..04eb2e4 100644 (file)
--- a/drivers/mtd/devices/doc2001plus.c
+++ b/drivers/mtd/devices/doc2001plus.c
@@ -469,6 +469,7 @@ void DoCMilPlus_init(struct mtd_info *mtd)
        mtd->flags = MTD_CAP_NANDFLASH;
        mtd->writebufsize = mtd->writesize = 512;
        mtd->oobsize = 16;
+       mtd->ecc_strength = 2;
        mtd->owner = THIS_MODULE;
        mtd->_erase = doc_erase;
        mtd->_read = doc_read;

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 2c1d0fc..349bbfa 100644 (file)
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1832,6 +1832,7 @@ static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
        mtd->_write_oob = doc_write_oob;
        mtd->_block_isbad = doc_block_isbad;
        mtd->ecclayout = &docg3_oobinfo;
+       mtd->ecc_strength = DOC_ECC_BCH_T;
 }
 
 /**

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 226d28a..9651c06 100644 (file)
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -516,6 +516,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
        }
 
        slave->mtd.ecclayout = master->ecclayout;
+       slave->mtd.ecc_strength = master->ecc_strength;
        if (master->_block_isbad) {
                uint64_t offs = 0;
 

diff --git a/drivers/mtd/nand/alauda.c b/drivers/mtd/nand/alauda.c
index ac38f73..4f20e1d 100644 (file)
--- a/drivers/mtd/nand/alauda.c
+++ b/drivers/mtd/nand/alauda.c
@@ -591,6 +591,7 @@ static int alauda_init_media(struct alauda *al)
        mtd->_block_isbad = alauda_isbad;
        mtd->priv = al;
        mtd->owner = THIS_MODULE;
+       mtd->ecc_strength = 1;
 
        err = mtd_device_register(mtd, NULL, 0);
        if (err) {

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 7769519..662abf0 100644 (file)
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -554,6 +554,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
                nand_chip->ecc.hwctl = atmel_nand_hwctl;
                nand_chip->ecc.read_page = atmel_nand_read_page;
                nand_chip->ecc.bytes = 4;
+               nand_chip->ecc.strength = 1;
        }
 
        nand_chip->chip_delay = 20;             /* 20us command delay time */

diff --git a/drivers/mtd/nand/bcm_umi_nand.c b/drivers/mtd/nand/bcm_umi_nand.c
index ee81b63..fc60043 100644 (file)
--- a/drivers/mtd/nand/bcm_umi_nand.c
+++ b/drivers/mtd/nand/bcm_umi_nand.c
@@ -476,6 +476,14 @@ static int __devinit bcm_umi_nand_probe(struct platform_device *pdev)
                        largepage_bbt.options = NAND_BBT_SCAN2NDPAGE;
                this->badblock_pattern = &largepage_bbt;
        }
+
+       /*
+        * FIXME: ecc strength value of 6 bits per 512 bytes of data is a
+        * conservative guess, given 13 ecc bytes and using bch alg.
+        * (Assume Galois field order m=15 to allow a margin of error.)
+        */
+       this->ecc.strength = 6;
+
 #endif
 
        /* Now finish off the scan, now that ecc.layout has been initialized. */

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index dd899cb..d7b86b9 100644 (file)
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -702,9 +702,11 @@ static int bf5xx_nand_scan(struct mtd_info *mtd)
                if (likely(mtd->writesize >= 512)) {
                        chip->ecc.size = 512;
                        chip->ecc.bytes = 6;
+                       chip->ecc.strength = 2;
                } else {
                        chip->ecc.size = 256;
                        chip->ecc.bytes = 3;
+                       chip->ecc.strength = 1;
                        bfin_write_NFC_CTL(bfin_read_NFC_CTL() & ~(1 << NFC_PG_SIZE_OFFSET));
                        SSYNC();
                }

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index c23c07c..2a96e1a 100644 (file)
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -783,6 +783,7 @@ static int __devinit cafe_nand_probe(struct pci_dev *pdev,
        cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
        cafe->nand.ecc.size = mtd->writesize;
        cafe->nand.ecc.bytes = 14;
+       cafe->nand.ecc.strength = 4;
        cafe->nand.ecc.hwctl  = (void *)cafe_nand_bug;
        cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
        cafe->nand.ecc.correct  = (void *)cafe_nand_bug;

diff --git a/drivers/mtd/nand/cs553x_nand.c b/drivers/mtd/nand/cs553x_nand.c
index e2b7c9e..821c34c 100644 (file)
--- a/drivers/mtd/nand/cs553x_nand.c
+++ b/drivers/mtd/nand/cs553x_nand.c
@@ -248,6 +248,8 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
                goto out_ior;
        }
 
+       this->ecc.strength = 1;
+
        new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
 
        cs553x_mtd[cs] = new_mtd;

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index b81afc7..d94b03c 100644 (file)
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -641,6 +641,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
                        info->chip.ecc.bytes = 3;
                }
                info->chip.ecc.size = 512;
+               info->chip.ecc.strength = pdata->ecc_bits;
                break;
        default:
                ret = -EINVAL;

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 3984d48..a9e57d6 100644 (file)
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1590,6 +1590,7 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
                        ECC_15BITS * (denali->mtd.writesize /
                        ECC_SECTOR_SIZE)))) {
                /* if MLC OOB size is large enough, use 15bit ECC*/
+               denali->nand.ecc.strength = 15;
                denali->nand.ecc.layout = &nand_15bit_oob;
                denali->nand.ecc.bytes = ECC_15BITS;
                iowrite32(15, denali->flash_reg + ECC_CORRECTION);
@@ -1600,12 +1601,14 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
                                " contain 8bit ECC correction codes");
                goto failed_req_irq;
        } else {
+               denali->nand.ecc.strength = 8;
                denali->nand.ecc.layout = &nand_8bit_oob;
                denali->nand.ecc.bytes = ECC_8BITS;
                iowrite32(8, denali->flash_reg + ECC_CORRECTION);
        }
 
        denali->nand.ecc.bytes *= denali->devnum;
+       denali->nand.ecc.strength *= denali->devnum;
        denali->nand.ecc.layout->eccbytes *=
                denali->mtd.writesize / ECC_SECTOR_SIZE;
        denali->nand.ecc.layout->oobfree[0].offset =

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index df921e7..e2ca067 100644 (file)
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -1653,6 +1653,7 @@ static int __init doc_probe(unsigned long physadr)
        nand->ecc.mode          = NAND_ECC_HW_SYNDROME;
        nand->ecc.size          = 512;
        nand->ecc.bytes         = 6;
+       nand->ecc.strength      = 2;
        nand->bbt_options       = NAND_BBT_USE_FLASH;
 
        doc->physadr            = physadr;

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index 9b3a649..b082026 100644 (file)
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -1191,6 +1191,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
        nand->ecc.size = DOCG4_PAGE_SIZE;
        nand->ecc.prepad = 8;
        nand->ecc.bytes = 8;
+       nand->ecc.strength = DOCG4_T;
        nand->options =
                NAND_BUSWIDTH_16 | NAND_NO_SUBPAGE_WRITE | NAND_NO_AUTOINCR;
        nand->IO_ADDR_R = nand->IO_ADDR_W = doc->virtadr + DOC_IOSPACE_DATA;

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 7195ee6..80b5264 100644 (file)
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -813,6 +813,12 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
                                &fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
                chip->ecc.size = 512;
                chip->ecc.bytes = 3;
+               chip->ecc.strength = 1;
+               /*
+                * FIXME: can hardware ecc correct 4 bitflips if page size is
+                * 2k?  Then does hardware report number of corrections for this
+                * case?  If so, ecc_stats reporting needs to be fixed as well.
+                */
        } else {
                /* otherwise fall back to default software ECC */
                chip->ecc.mode = NAND_ECC_SOFT;

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 341086c..588e373 100644 (file)
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -863,10 +863,12 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
                nand->ecc.calculate = fsmc_read_hwecc_ecc4;
                nand->ecc.correct = fsmc_bch8_correct_data;
                nand->ecc.bytes = 13;
+               nand->ecc.strength = 8;
        } else {
                nand->ecc.calculate = fsmc_read_hwecc_ecc1;
                nand->ecc.correct = nand_correct_data;
                nand->ecc.bytes = 3;
+               nand->ecc.strength = 1;
        }
 
        /*

diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index cc50e35..e4147e8 100644 (file)
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -332,6 +332,11 @@ static int __devinit jz_nand_probe(struct platform_device *pdev)
        chip->ecc.mode          = NAND_ECC_HW_OOB_FIRST;
        chip->ecc.size          = 512;
        chip->ecc.bytes         = 9;
+       chip->ecc.strength      = 2;
+       /*
+        * FIXME: ecc_strength value of 2 bits per 512 bytes of data is a
+        * conservative guess, given 9 ecc bytes and reed-solomon alg.
+        */
 
        if (pdata)
                chip->ecc.layout = pdata->ecc_layout;

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 3c4c053..cc0678a 100644 (file)
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1225,6 +1225,13 @@ static int __init mxcnd_probe(struct platform_device *pdev)
                goto escan;
        }
 
+       if (this->ecc.mode == NAND_ECC_HW) {
+               if (nfc_is_v1())
+                       this->ecc.strength = 1;
+               else
+                       this->ecc.strength = (host->eccsize == 4) ? 4 : 8;
+       }
+
        /* Register the partitions */
        mtd_device_parse_register(mtd, part_probes, NULL, pdata->parts,
                                  pdata->nr_parts);

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 1e907dc..8008853 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3350,6 +3350,7 @@ int nand_scan_tail(struct mtd_info *mtd)
                if (!chip->ecc.size)
                        chip->ecc.size = 256;
                chip->ecc.bytes = 3;
+               chip->ecc.strength = 1;
                break;
 
        case NAND_ECC_SOFT_BCH:
@@ -3384,6 +3385,8 @@ int nand_scan_tail(struct mtd_info *mtd)
                        pr_warn("BCH ECC initialization failed!\n");
                        BUG();
                }
+               chip->ecc.strength =
+                       chip->ecc.bytes*8 / fls(8*chip->ecc.size);
                break;
 
        case NAND_ECC_NONE:
@@ -3397,6 +3400,7 @@ int nand_scan_tail(struct mtd_info *mtd)
                chip->ecc.write_oob = nand_write_oob_std;
                chip->ecc.size = mtd->writesize;
                chip->ecc.bytes = 0;
+               chip->ecc.strength = 0;
                break;
 
        default:
@@ -3478,8 +3482,9 @@ int nand_scan_tail(struct mtd_info *mtd)
        mtd->_block_markbad = nand_block_markbad;
        mtd->writebufsize = mtd->writesize;
 
-       /* propagate ecc.layout to mtd_info */
+       /* propagate ecc info to mtd_info */
        mtd->ecclayout = chip->ecc.layout;
+       mtd->ecc_strength = chip->ecc.strength * chip->ecc.steps;
 
        /* Check, if we should skip the bad block table scan */
        if (chip->options & NAND_SKIP_BBTSCAN)

diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
index ec68854..2b6f632 100644 (file)
--- a/drivers/mtd/nand/ndfc.c
+++ b/drivers/mtd/nand/ndfc.c
@@ -179,6 +179,7 @@ static int ndfc_chip_init(struct ndfc_controller *ndfc,
        chip->ecc.mode = NAND_ECC_HW;
        chip->ecc.size = 256;
        chip->ecc.bytes = 3;
+       chip->ecc.strength = 1;
        chip->priv = ndfc;
 
        ndfc->mtd.priv = chip;

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index d2e7a7d..c2b0bba 100644 (file)
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1058,6 +1058,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
                (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE)) {
                info->nand.ecc.bytes            = 3;
                info->nand.ecc.size             = 512;
+               info->nand.ecc.strength         = 1;
                info->nand.ecc.calculate        = omap_calculate_ecc;
                info->nand.ecc.hwctl            = omap_enable_hwecc;
                info->nand.ecc.correct          = omap_correct_data;

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index d3bdc90..def50ca 100644 (file)
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -1002,6 +1002,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 KEEP_CONFIG:
        chip->ecc.mode = NAND_ECC_HW;
        chip->ecc.size = host->page_size;
+       chip->ecc.strength = 1;
 
        chip->options = NAND_NO_AUTOINCR;
        chip->options |= NAND_NO_READRDY;

diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
index 769a4e0..c204018 100644 (file)
--- a/drivers/mtd/nand/r852.c
+++ b/drivers/mtd/nand/r852.c
@@ -891,6 +891,7 @@ int  r852_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
        chip->ecc.mode = NAND_ECC_HW_SYNDROME;
        chip->ecc.size = R852_DMA_LEN;
        chip->ecc.bytes = SM_OOB_SIZE;
+       chip->ecc.strength = 2;
        chip->ecc.hwctl = r852_ecc_hwctl;
        chip->ecc.calculate = r852_ecc_calculate;
        chip->ecc.correct = r852_ecc_correct;

diff --git a/drivers/mtd/nand/rtc_from4.c b/drivers/mtd/nand/rtc_from4.c
index f309add..e55b5cf 100644 (file)
--- a/drivers/mtd/nand/rtc_from4.c
+++ b/drivers/mtd/nand/rtc_from4.c
@@ -527,6 +527,7 @@ static int __init rtc_from4_init(void)
        this->ecc.mode = NAND_ECC_HW_SYNDROME;
        this->ecc.size = 512;
        this->ecc.bytes = 8;
+       this->ecc.strength = 3;
        /* return the status of extra status and ECC checks */
        this->errstat = rtc_from4_errstat;
        /* set the nand_oobinfo to support FPGA H/W error detection */

diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 97623be..91121f3 100644 (file)
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -823,6 +823,7 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
                chip->ecc.calculate = s3c2410_nand_calculate_ecc;
                chip->ecc.correct   = s3c2410_nand_correct_data;
                chip->ecc.mode      = NAND_ECC_HW;
+               chip->ecc.strength  = 1;
 
                switch (info->cpu_type) {
                case TYPE_S3C2410:

diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 2ee9a1b..e9b2b26 100644 (file)
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -825,6 +825,7 @@ static int flctl_chip_init_tail(struct mtd_info *mtd)
 
                chip->ecc.size = 512;
                chip->ecc.bytes = 10;
+               chip->ecc.strength = 4;
                chip->ecc.read_page = flctl_read_page_hwecc;
                chip->ecc.write_page = flctl_write_page_hwecc;
                chip->ecc.mode = NAND_ECC_HW;

diff --git a/drivers/mtd/nand/sharpsl.c b/drivers/mtd/nand/sharpsl.c
index 2d269a5..3421e37 100644 (file)
--- a/drivers/mtd/nand/sharpsl.c
+++ b/drivers/mtd/nand/sharpsl.c
@@ -167,6 +167,7 @@ static int __devinit sharpsl_nand_probe(struct platform_device *pdev)
        this->ecc.mode = NAND_ECC_HW;
        this->ecc.size = 256;
        this->ecc.bytes = 3;
+       this->ecc.strength = 1;
        this->badblock_pattern = data->badblock_pattern;
        this->ecc.layout = data->ecc_layout;
        this->ecc.hwctl = sharpsl_nand_enable_hwecc;

diff --git a/drivers/mtd/nand/tmio_nand.c b/drivers/mtd/nand/tmio_nand.c
index 060848a..5aa5180 100644 (file)
--- a/drivers/mtd/nand/tmio_nand.c
+++ b/drivers/mtd/nand/tmio_nand.c
@@ -430,6 +430,7 @@ static int tmio_probe(struct platform_device *dev)
        nand_chip->ecc.mode = NAND_ECC_HW;
        nand_chip->ecc.size = 512;
        nand_chip->ecc.bytes = 6;
+       nand_chip->ecc.strength = 2;
        nand_chip->ecc.hwctl = tmio_nand_enable_hwecc;
        nand_chip->ecc.calculate = tmio_nand_calculate_ecc;
        nand_chip->ecc.correct = tmio_nand_correct_data;

diff --git a/drivers/mtd/nand/txx9ndfmc.c b/drivers/mtd/nand/txx9ndfmc.c
index 8db0acb..26398dc 100644 (file)
--- a/drivers/mtd/nand/txx9ndfmc.c
+++ b/drivers/mtd/nand/txx9ndfmc.c
@@ -356,6 +356,7 @@ static int __init txx9ndfmc_probe(struct platform_device *dev)
                /* txx9ndfmc_nand_scan will overwrite ecc.size and ecc.bytes */
                chip->ecc.size = 256;
                chip->ecc.bytes = 3;
+               chip->ecc.strength = 1;
                chip->chip_delay = 100;
                chip->controller = &drvdata->hw_control;
 

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index a1592cf..3d781b8 100644 (file)
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -4080,6 +4080,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
        mtd->oobavail = this->ecclayout->oobavail;
 
        mtd->ecclayout = this->ecclayout;
+       mtd->ecc_strength = 1;
 
        /* Fill in remaining MTD driver data */
        mtd->type = ONENAND_IS_MLC(this) ? MTD_MLCNANDFLASH : MTD_NANDFLASH;