[PATCH 2/6] mtd: atmel_nand: replace pmecc enable code with one function.

[Brian Norris]

Hi Josh,

On Mon, Aug 05, 2013 at 07:14:34PM +0800, Josh Wu wrote:
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 3d7db95..28d159a 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -746,6 +746,30 @@ normal_check:
>  	return total_err;
>  }
>  
> +static void pmecc_enable(struct atmel_nand_host *host, int ecc_op)
> +{
> +	u32 val;
> +
> +	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> +	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> +	val = pmecc_readl_relaxed(host->ecc, CFG);
> +
> +	if (ecc_op != NAND_ECC_READ && ecc_op != NAND_ECC_WRITE) {
> +		dev_err(host->dev, "atmel_nand: wrong pmecc operation type!");
> +		return;
> +	}

Why is this check after the reset and disable? Shouldn't it be placed at
the beginning of the function? But this is a somewhat strange check
anyway, since this function is private to the driver (static).

> +
> +	if (ecc_op == NAND_ECC_READ)
> +		pmecc_writel(host->ecc, CFG, (val & ~PMECC_CFG_WRITE_OP)
> +			| PMECC_CFG_AUTO_ENABLE);
> +	else
> +		pmecc_writel(host->ecc, CFG, (val | PMECC_CFG_WRITE_OP)
> +			& ~PMECC_CFG_AUTO_ENABLE);
> +
> +	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
> +	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
> +}
> +
>  static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
>  {

Brian