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mtd: gpmi: Always report ECC stats and return max_bitflips 

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@itwatchdogs.com>
Acked-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Zach Sadecki 2012-12-13 20:36:29 -06:00 committed by Artem Bityutskiy
parent e830342ef3
commit b23b746cdc
1 changed files with 8 additions and 19 deletions
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27
drivers/mtd/nand/gpmi-nand/gpmi-nand.c
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@ -920,8 +920,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
dma_addr_t auxiliary_phys; dma_addr_t auxiliary_phys;
unsigned int i; unsigned int i;
unsigned char *status; unsigned char *status;
unsigned int failed; unsigned int max_bitflips = 0;
unsigned int corrected;
int ret; int ret;
pr_debug("page number is : %d\n", page); pr_debug("page number is : %d\n", page);
@ -945,35 +944,25 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
payload_virt, payload_phys); payload_virt, payload_phys);
if (ret) { if (ret) {
pr_err("Error in ECC-based read: %d\n", ret); pr_err("Error in ECC-based read: %d\n", ret);
goto exit_nfc; return ret;
} }
/* handle the block mark swapping */ /* handle the block mark swapping */
block_mark_swapping(this, payload_virt, auxiliary_virt); block_mark_swapping(this, payload_virt, auxiliary_virt);
/* Loop over status bytes, accumulating ECC status. */ /* Loop over status bytes, accumulating ECC status. */
failed = 0; status = auxiliary_virt + nfc_geo->auxiliary_status_offset;
corrected = 0;
status = auxiliary_virt + nfc_geo->auxiliary_status_offset;
for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) { for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) {
if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED)) if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED))
continue; continue;
if (*status == STATUS_UNCORRECTABLE) { if (*status == STATUS_UNCORRECTABLE) {
failed++; mtd->ecc_stats.failed++;
continue; continue;
} }
corrected += *status; mtd->ecc_stats.corrected += *status;
} max_bitflips = max_t(unsigned int, max_bitflips, *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;
} }
if (oob_required) { if (oob_required) {
@ -995,8 +984,8 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
this->payload_virt, this->payload_phys, this->payload_virt, this->payload_phys,
nfc_geo->payload_size, nfc_geo->payload_size,
payload_virt, payload_phys); 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, static int gpmi_ecc_write_page(struct mtd_info *mtd, struct nand_chip *chip,