[PATCH v4 6/6] mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT

[Tudor Ambarus]

On 08.09.2023 09:43, Jaime Liao wrote:
> From: JaimeLiao <jaimeliao at mxic.com.tw>
> 
> Parse BFPT in order to retrieve the byte order in 8D-8D-8D mode.

Oh, here it is. Why do you need the flash info flag then?

> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
> Signed-off-by: JaimeLiao <jaimeliao at mxic.com.tw>
> ---
>  drivers/mtd/spi-nor/sfdp.c | 4 ++++
>  drivers/mtd/spi-nor/sfdp.h | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
> index b3b11dfed789..2241207556bf 100644
> --- a/drivers/mtd/spi-nor/sfdp.c
> +++ b/drivers/mtd/spi-nor/sfdp.c
> @@ -650,6 +650,10 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
>  		return -EOPNOTSUPP;
>  	}
>  
> +	/* Byte order in 8D-8D-8D mode */
> +	if (bfpt.dwords[SFDP_DWORD(18)] & BFPT_DWORD18_BYTE_ORDER_SWAPPED)
> +		nor->flags |= SNOR_F_DTR_SWAB16;
> +
>  	return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt);
>  }
>  
> diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
> index 6eb99e1cdd61..eba760941d43 100644
> --- a/drivers/mtd/spi-nor/sfdp.h
> +++ b/drivers/mtd/spi-nor/sfdp.h
> @@ -123,6 +123,7 @@ struct sfdp_bfpt {
>  #define BFPT_DWORD18_CMD_EXT_INV		(0x1UL << 29) /* Invert */
>  #define BFPT_DWORD18_CMD_EXT_RES		(0x2UL << 29) /* Reserved */
>  #define BFPT_DWORD18_CMD_EXT_16B		(0x3UL << 29) /* 16-bit opcode */
> +#define BFPT_DWORD18_BYTE_ORDER_SWAPPED		BIT(31) /* Byte order of 16-bit words in 8D-8D-8D mode */
>  
>  struct sfdp_parameter_header {
>  	u8		id_lsb;