[PATCH] mtd: gpmi: Always report ECC stats and return max_bitflips

[Zach Sadecki]

Always report corrected and failed ECC stats back up to the MTD layer.  Also
return max_bitflips from read_page() as is expected from NAND drivers now.

Signed-off-by: Zach Sadecki <zsadecki at itwatchdogs.com>
Acked-by: Huang Shijie <b32955 at freescale.com>
---
  drivers/mtd/nand/gpmi-nand/gpmi-nand.c |   27 ++++++++-------------------
  1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c 
b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 5cd141f..1535bd5 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -921,8 +921,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, 
struct nand_chip *chip,
      dma_addr_t    auxiliary_phys;
      unsigned int  i;
      unsigned char *status;
-    unsigned int  failed;
-    unsigned int  corrected;
+    unsigned int  max_bitflips = 0;
      int           ret;

      pr_debug("page number is : %d\n", page);
@@ -946,35 +945,25 @@ static int gpmi_ecc_read_page(struct mtd_info 
*mtd, struct nand_chip *chip,
              payload_virt, payload_phys);
      if (ret) {
          pr_err("Error in ECC-based read: %d\n", ret);
-        goto exit_nfc;
+        return ret;
      }

      /* handle the block mark swapping */
      block_mark_swapping(this, payload_virt, auxiliary_virt);

      /* Loop over status bytes, accumulating ECC status. */
-    failed        = 0;
-    corrected    = 0;
-    status        = auxiliary_virt + nfc_geo->auxiliary_status_offset;
+    status = auxiliary_virt + nfc_geo->auxiliary_status_offset;

      for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) {
          if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED))
              continue;

          if (*status == STATUS_UNCORRECTABLE) {
-            failed++;
+            mtd->ecc_stats.failed++;
              continue;
          }
-        corrected += *status;
-    }
-
-    /*
-     * Propagate ECC status to the owning MTD only when failed or
-     * corrected times nearly reaches our ECC correction threshold.
-     */
-    if (failed || corrected >= (nfc_geo->ecc_strength - 1)) {
-        mtd->ecc_stats.failed    += failed;
-        mtd->ecc_stats.corrected += corrected;
+        mtd->ecc_stats.corrected += *status;
+        max_bitflips = max_t(unsigned int, max_bitflips, *status);
      }

      if (oob_required) {
@@ -996,8 +985,8 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, 
struct nand_chip *chip,
              this->payload_virt, this->payload_phys,
              nfc_geo->payload_size,
              payload_virt, payload_phys);
-exit_nfc:
-    return ret;
+
+    return max_bitflips;
  }

  static int gpmi_ecc_write_page(struct mtd_info *mtd, struct nand_chip 
*chip,
-- 
1.7.9.5