From patchwork Fri Dec 14 02:36:43 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: mtd: gpmi: Always report ECC stats and return max_bitflips Date: Thu, 13 Dec 2012 16:36:43 -0000 From: Zach Sadecki X-Patchwork-Id: 206283 Message-Id: <50CA90BB.5030801@itwatchdogs.com> To: Cc: linux-mtd@lists.infradead.org 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 Acked-by: Huang Shijie --- 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,