[PATCH v2 12/53] mtd: nand: denali: support HW_ECC_FIXUP capability

[Boris Brezillon]

On Wed, 22 Mar 2017 23:07:19 +0900
Masahiro Yamada <yamada.masahiro at socionext.com> wrote:

> +static int denali_hw_ecc_fixup(struct mtd_info *mtd,
> +			       struct denali_nand_info *denali)
> +{
> +	int bank = denali->flash_bank;
> +	uint32_t ecc_cor;
> +	unsigned int max_bitflips;
> +
> +	ecc_cor = ioread32(denali->flash_reg + ECC_COR_INFO(bank));
> +	ecc_cor >>= ECC_COR_INFO__SHIFT(bank);
> +
> +	if (ecc_cor & ECC_COR_INFO__UNCOR_ERR)
> +		return -EBADMSG;

As previously mentioned, just increment ecc_stats.failed.

> +
> +	max_bitflips = ecc_cor & ECC_COR_INFO__MAX_ERRORS;
> +
> +	/*
> +	 * The register holds the maximum of the number of corrected bitflips
> +	 * per sector.  This can be returned from ecc->read_page() as-is.
> +	 * Unfortunately, we can not know the total number of corrected bits
> +	 * in the page.  mtd->ecc_stats.corrected is compromised here.
> +	 */
> +	mtd->ecc_stats.corrected += max_bitflips;
> +
> +	return max_bitflips;
> +}