[U-Boot] [PATCH] mtd/nand:Fix wrong usage of is_blank() in fsl_ifc_run_command

[Prabhakar Kushwaha]

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 at freescale.com>
Signed-off-by: Scott Wood <scottwood at freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar at 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 at 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;
-- 
1.7.5.4