Re: [PATCH] MTD: at91: atmel_nand: return bit flips for the PMECC read_page()

[Nicolas Ferre <nicolas.ferre@atmel.com>]

On 11/21/2012 06:14 AM, Josh Wu :
> 
> 

Can we have more comment to figure out why it is needed please?

Best regards,

> Signed-off-by: Josh Wu <josh.wu@atmel.com>
> ---
>  drivers/mtd/nand/atmel_nand.c |   13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 9144557..860dd36 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -723,6 +723,7 @@ static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
>  	struct atmel_nand_host *host = nand_chip->priv;
>  	int i, err_nbr, eccbytes;
>  	uint8_t *buf_pos;
> +	int total_err = 0;
>  
>  	eccbytes = nand_chip->ecc.bytes;
>  	for (i = 0; i < eccbytes; i++)
> @@ -750,12 +751,13 @@ normal_check:
>  				pmecc_correct_data(mtd, buf_pos, ecc, i,
>  					host->pmecc_bytes_per_sector, err_nbr);
>  				mtd->ecc_stats.corrected += err_nbr;
> +				total_err += err_nbr;
>  			}
>  		}
>  		pmecc_stat >>= 1;
>  	}
>  
> -	return 0;
> +	return total_err;
>  }
>  
>  static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
> @@ -767,6 +769,7 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
> +	int bitflips = 0;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -789,11 +792,13 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	}
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
> -	if (stat != 0)
> -		if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
> +	if (stat != 0) {
> +		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		if (bitflips < 0)
>  			return -EIO;
> +	}
>  
> -	return 0;
> +	return bitflips;
>  }
>  
>  static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
> 


-- 
Nicolas Ferre