Freescale IFC NAND Machine calculates ECC on 512byte sector and same is used in fsl_ifc_run_command() during ECC status verification. Also this sector is passed to is_blank() for blank checking. It is wrong at first place because is_blank()'s implementation checks for Page size and OOB area size. is_blank() should be called per page for main and OOB area verification.

Variables name are redefined to avoid confusion between buffer and ecc sector.

Signed-off-by: Poonam Aggrwal poonam.aggrwal@freescale.com Signed-off-by: Scott Wood scottwood@freescale.com Signed-off-by: Prabhakar Kushwaha prabhakar@freescale.com --- Applied upon git://git.denx.de/u-boot.git (branch master)

This patch is based upon ifc driver patch in linuxppc-dev mailing list http://patchwork.ozlabs.org/patch/136547/

It is a replacement of my earlier patch "mtd/nand:Fix wrong address read in is_blank()" http://patchwork.ozlabs.org/patch/133388/

drivers/mtd/nand/fsl_ifc_nand.c | 52 +++++++++++++++++++++------------------ 1 files changed, 28 insertions(+), 24 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c index b3f3c3c..cd1a434 100644 --- a/drivers/mtd/nand/fsl_ifc_nand.c +++ b/drivers/mtd/nand/fsl_ifc_nand.c @@ -1,6 +1,6 @@ /* Integrated Flash Controller NAND Machine Driver * - * Copyright (c) 2011 Freescale Semiconductor, Inc + * Copyright (c) 2012 Freescale Semiconductor, Inc * * Authors: Dipen Dudhat Dipen.Dudhat@freescale.com * @@ -221,24 +221,11 @@ static int check_read_ecc(struct mtd_info *mtd, struct fsl_ifc_ctrl *ctrl, u32 *eccstat, unsigned int bufnum) { u32 reg = eccstat[bufnum / 4]; - int errors = (reg >> ((3 - bufnum % 4) * 8)) & 15; - - if (errors == 15) { /* uncorrectable */ - /* Blank pages fail hw ECC checks */ - if (is_blank(mtd, ctrl, bufnum)) - return 1; - - /* - * We disable ECCER reporting in hardware due to - * erratum IFC-A002770 -- so report it now if we - * see an uncorrectable error in ECCSTAT. - */ - ctrl->status |= IFC_NAND_EVTER_STAT_ECCER; - } else if (errors > 0) { - mtd->ecc_stats.corrected += errors; - } + int errors;

- return 0; + errors = (reg >> ((3 - bufnum % 4) * 8)) & 15; + + return errors; }

/* @@ -279,16 +266,33 @@ static int fsl_ifc_run_command(struct mtd_info *mtd) printf("%s: Write Protect Error\n", __func__);

if (ctrl->eccread) { - int bufperpage = mtd->writesize / 512; - int bufnum = (ctrl->page & priv->bufnum_mask) * bufperpage; - int bufnum_end = bufnum + bufperpage - 1; + int errors; + int bufnum = ctrl->page & priv->bufnum_mask; + int sector = bufnum * chip->ecc.steps; + int sector_end = sector + chip->ecc.steps - 1;

- for (i = bufnum / 4; i <= bufnum_end / 4; i++) + for (i = sector / 4; i <= sector_end / 4; i++) eccstat[i] = in_be32(&ifc->ifc_nand.nand_eccstat[i]);

- for (i = bufnum; i <= bufnum_end; i++) { - if (check_read_ecc(mtd, ctrl, eccstat, i)) + for (i = sector; i <= sector_end; i++) { + errors = check_read_ecc(mtd, ctrl, eccstat, i); + + if (errors == 15) { + /* + * Uncorrectable error. + * OK only if the whole page is blank. + * + * We disable ECCER reporting due to... + * erratum IFC-A002770 -- so report it now if we + * see an uncorrectable error in ECCSTAT. + */ + if (!is_blank(mtd, ctrl, bufnum)) + ctrl->status |= + IFC_NAND_EVTER_STAT_ECCER; break; + } + + mtd->ecc_stats.corrected += errors; }

ctrl->eccread = 0;