mtd: eLBC NAND: update ecc_stats.corrected when lteccr available

Signed-off-by: Michael Hench <MichaelHench@gmail.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index acc27ee..eedd8ee 100644 (file)
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -243,6 +243,25 @@ static int fsl_elbc_run_command(struct mtd_info *mtd)
                return -EIO;
        }
 
+       if (chip->ecc.mode != NAND_ECC_HW)
+               return 0;
+
+       if (elbc_fcm_ctrl->read_bytes == mtd->writesize + mtd->oobsize) {
+               uint32_t lteccr = in_be32(&lbc->lteccr);
+               /*
+                * if command was a full page read and the ELBC
+                * has the LTECCR register, then bits 12-15 (ppc order) of
+                * LTECCR indicates which 512 byte sub-pages had fixed errors.
+                * bits 28-31 are uncorrectable errors, marked elsewhere.
+                * for small page nand only 1 bit is used.
+                * if the ELBC doesn't have the lteccr register it reads 0
+                */
+               if (lteccr & 0x000F000F)
+                       out_be32(&lbc->lteccr, 0x000F000F); /* clear lteccr */
+               if (lteccr & 0x000F0000)
+                       mtd->ecc_stats.corrected++;
+       }
+
        return 0;
 }