[PATCH next 1/2] mtd: nand: qpic-common: add defines for ECC_MODE values

[Md Sadre Alam]

On 5/3/2025 1:01 AM, Gabor Juhos wrote:
> Add defines for the values of the ECC_MODE field of the NAND_DEV0_ECC_CFG
> register and change both the 'qcom-nandc' and 'spi-qpic-snand' drivers to
> use those instead of magic numbers.
> 
> No functional changes. This is in preparation for adding 8 bit ECC strength
> support for the 'spi-qpic-snand' driver.
> 
> Signed-off-by: Gabor Juhos <j4g8y7 at gmail.com>
> ---
>   drivers/mtd/nand/raw/qcom_nandc.c    | 6 +++---
>   drivers/spi/spi-qpic-snand.c         | 2 +-
>   include/linux/mtd/nand-qpic-common.h | 2 ++
>   3 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> index 5eaa0be367cdb847d48dbed6f8326a75a5922347..67641ce28bd6435fffda3ffe5e38c777f4708cf8 100644
> --- a/drivers/mtd/nand/raw/qcom_nandc.c
> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> @@ -1379,7 +1379,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
>   	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
>   	int cwperpage, bad_block_byte, ret;
>   	bool wide_bus;
> -	int ecc_mode = 1;
> +	int ecc_mode = ECC_MODE_8BIT;
>   
>   	/* controller only supports 512 bytes data steps */
>   	ecc->size = NANDC_STEP_SIZE;
> @@ -1400,7 +1400,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
>   	if (ecc->strength >= 8) {
>   		/* 8 bit ECC defaults to BCH ECC on all platforms */
>   		host->bch_enabled = true;
> -		ecc_mode = 1;
> +		ecc_mode = ECC_MODE_8BIT;
>   
>   		if (wide_bus) {
>   			host->ecc_bytes_hw = 14;
> @@ -1420,7 +1420,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
>   		if (nandc->props->ecc_modes & ECC_BCH_4BIT) {
>   			/* BCH */
>   			host->bch_enabled = true;
> -			ecc_mode = 0;
> +			ecc_mode = ECC_MODE_4BIT;
>   
>   			if (wide_bus) {
>   				host->ecc_bytes_hw = 8;
> diff --git a/drivers/spi/spi-qpic-snand.c b/drivers/spi/spi-qpic-snand.c
> index 88f8fa98687fa292861d46648872135aa7fad80f..dfc8cc5d97624fe741121228b97d2b3562cc5cc4 100644
> --- a/drivers/spi/spi-qpic-snand.c
> +++ b/drivers/spi/spi-qpic-snand.c
> @@ -349,7 +349,7 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
>   			       FIELD_PREP(ECC_SW_RESET, 0) |
>   			       FIELD_PREP(ECC_NUM_DATA_BYTES_MASK, ecc_cfg->cw_data) |
>   			       FIELD_PREP(ECC_FORCE_CLK_OPEN, 1) |
> -			       FIELD_PREP(ECC_MODE_MASK, 0) |
> +			       FIELD_PREP(ECC_MODE_MASK, ECC_MODE_4BIT) |
>   			       FIELD_PREP(ECC_PARITY_SIZE_BYTES_BCH_MASK, ecc_cfg->ecc_bytes_hw);
>   
>   	ecc_cfg->ecc_buf_cfg = 0x203 << NUM_STEPS;
> diff --git a/include/linux/mtd/nand-qpic-common.h b/include/linux/mtd/nand-qpic-common.h
> index cd7172e6c1bbffeee0363a14044980a72ea17723..a070af4593754384d9df4f6206a24665e2040aad 100644
> --- a/include/linux/mtd/nand-qpic-common.h
> +++ b/include/linux/mtd/nand-qpic-common.h
> @@ -101,6 +101,8 @@
>   #define	ECC_SW_RESET			BIT(1)
>   #define	ECC_MODE			4
>   #define	ECC_MODE_MASK			GENMASK(5, 4)
> +#define	ECC_MODE_4BIT			0
> +#define	ECC_MODE_8BIT			1
>   #define	ECC_PARITY_SIZE_BYTES_BCH	8
>   #define	ECC_PARITY_SIZE_BYTES_BCH_MASK	GENMASK(12, 8)
>   #define	ECC_NUM_DATA_BYTES		16
> 

Reviewed-by: Md Sadre Alam <quic_mdalam at quicinc.com>