linux-kernel - Re: [PATCH 12/12] mtd: mtd: drop NAND_ECC_SOFT

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Message-ID: <20160417190537.0b484bdd@bbrezillon>
Date:	Sun, 17 Apr 2016 19:05:37 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	linux-mtd@...ts.infradead.org, Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	linux-kernel@...r.kernel.org (open list),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Allwinner
	sunXi SoC support)
Subject: Re: [PATCH 12/12] mtd: mtd: drop NAND_ECC_SOFT_BCH enum value

On Fri, 15 Apr 2016 21:54:12 +0200
Rafał Miłecki <zajec5@...il.com> wrote:

> This value should not be part of nand_ecc_modes_t as it specifies
> algorithm not a mode. We successfully managed to introduce new "algo"
> field which is respected now.
> 
> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
> ---
>  drivers/mtd/nand/fsmc_nand.c   | 3 +--
>  drivers/mtd/nand/jz4780_nand.c | 1 -
>  drivers/mtd/nand/nand_base.c   | 2 --
>  drivers/mtd/nand/nandsim.c     | 2 +-
>  drivers/mtd/nand/sunxi_nand.c  | 2 --
>  include/linux/mtd/nand.h       | 1 -
>  6 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
> index 0f8c63f..d4f454a 100644
> --- a/drivers/mtd/nand/fsmc_nand.c
> +++ b/drivers/mtd/nand/fsmc_nand.c
> @@ -959,7 +959,6 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
>  			break;
>  
>  		case NAND_ECC_SOFT:
> -		case NAND_ECC_SOFT_BCH:
>  			if (nand->ecc.algo == NAND_ECC_BCH) {
>  				dev_info(&pdev->dev, "Using 4-bit SW BCH ECC scheme\n");
>  				break;
> @@ -974,7 +973,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
>  		 * Don't set layout for BCH4 SW ECC. This will be
>  		 * generated later in nand_bch_init() later.
>  		 */
> -		if (nand->ecc.mode != NAND_ECC_SOFT_BCH) {
> +		if (nand->ecc.mode == NAND_ECC_HW) {

This test is wrong, it should be

		if (nand->ecc.mode != NAND_ECC_SOFT ||
		    nand->ecc.algo != NAND_ECC_BCH)

or
		if (!(nand->ecc.mode == NAND_ECC_SOFT &&
		      nand->ecc.algo == NAND_ECC_BCH)

>  			switch (mtd->oobsize) {
>  			case 16:
>  			case 64:
> diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
> index 10f249a..daf3c42 100644
> --- a/drivers/mtd/nand/jz4780_nand.c
> +++ b/drivers/mtd/nand/jz4780_nand.c
> @@ -179,7 +179,6 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
>  		chip->ecc.correct = jz4780_nand_ecc_correct;
>  		/* fall through */
>  	case NAND_ECC_SOFT:
> -	case NAND_ECC_SOFT_BCH:
>  		dev_info(dev, "using %s (strength %d, size %d, bytes %d)\n",
>  			(nfc->bch) ? "hardware BCH" : "software ECC",
>  			chip->ecc.strength, chip->ecc.size, chip->ecc.bytes);
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index ffd1b32..186d5b5 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -4248,7 +4248,6 @@ int nand_scan_tail(struct mtd_info *mtd)
>  		ecc->algo = NAND_ECC_HAMMING;
>  
>  	case NAND_ECC_SOFT:
> -	case NAND_ECC_SOFT_BCH:
>  		switch (ecc->algo) {
>  		case NAND_ECC_HAMMING:
>  			ecc->calculate = nand_calculate_ecc;
> @@ -4386,7 +4385,6 @@ int nand_scan_tail(struct mtd_info *mtd)
>  	/* Large page NAND with SOFT_ECC should support subpage reads */
>  	switch (ecc->mode) {
>  	case NAND_ECC_SOFT:
> -	case NAND_ECC_SOFT_BCH:
>  		if (chip->page_shift > 9)
>  			chip->options |= NAND_SUBPAGE_READ;
>  		break;
> diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
> index 6ff1d8d..b0074c2 100644
> --- a/drivers/mtd/nand/nandsim.c
> +++ b/drivers/mtd/nand/nandsim.c
> @@ -2339,7 +2339,7 @@ static int __init ns_init_module(void)
>  			retval = -EINVAL;
>  			goto error;
>  		}
> -		chip->ecc.mode = NAND_ECC_SOFT_BCH;
> +		chip->ecc.mode = NAND_ECC_SOFT;
>  		chip->ecc.algo = NAND_ECC_BCH;
>  		chip->ecc.size = 512;
>  		chip->ecc.strength = bch;
> diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
> index 1baf8983..a83a690 100644
> --- a/drivers/mtd/nand/sunxi_nand.c
> +++ b/drivers/mtd/nand/sunxi_nand.c
> @@ -1612,8 +1612,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
>  		return -EINVAL;
>  
>  	switch (ecc->mode) {
> -	case NAND_ECC_SOFT_BCH:
> -		break;
>  	case NAND_ECC_HW:
>  		ret = sunxi_nand_hw_ecc_ctrl_init(mtd, ecc, np);
>  		if (ret)
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index e851839..fbe8e16 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -116,7 +116,6 @@ typedef enum {
>  	NAND_ECC_HW,
>  	NAND_ECC_HW_SYNDROME,
>  	NAND_ECC_HW_OOB_FIRST,
> -	NAND_ECC_SOFT_BCH,
>  } nand_ecc_modes_t;
>  
>  enum nand_ecc_algo {



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com