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authorPrabhakar Kushwaha <prabhakar@freescale.com>2012-01-20 18:38:14 +0530
committerScott Wood <scottwood@freescale.com>2012-02-28 14:03:39 -0600
commit5f720b85141646055c08bbccb0e2549f654563de (patch)
tree5d1b00f9a132eeb4226bacd3e8cfb6add6bf9807 /drivers/mtd
parentd90361285c1c9751bd1b3700a18db882b32ddad5 (diff)
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mtd/nand:Fix wrong usage of is_blank() in fsl_ifc_run_command
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: Prabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/fsl_ifc_nand.c52
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 36e1bae..5cac78b 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;