linux-kernel - Re: [PATCH 3/4] mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT

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Date:   Mon, 21 Feb 2022 08:40:39 +0100
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     p.yadav@...com, broonie@...nel.org, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        nicolas.ferre@...rochip.com, zhengxunli@...c.com.tw,
        jaimeliao@...c.com.tw
Subject: Re: [PATCH 3/4] mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from
 BFPT

Am 2022-02-18 15:58, schrieb Tudor Ambarus:
> Parse BFPT in order to retrieve the byte order in 8D-8D-8D mode.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/spi-nor/sfdp.c | 3 +++
>  drivers/mtd/spi-nor/sfdp.h | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
> index a5211543d30d..551edbb039f0 100644
> --- a/drivers/mtd/spi-nor/sfdp.c
> +++ b/drivers/mtd/spi-nor/sfdp.c
> @@ -633,6 +633,9 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
>  		return -EOPNOTSUPP;
>  	}
> 
> +	if (bfpt.dwords[BFPT_DWORD(18)] & BFPT_DWORD18_BYTE_ORDER_SWAPPED)
> +		nor->flags |= SNOR_F_DTR_BSWAP16;
> +
>  	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 bbf80d2990ab..9a834ea31c16 100644
> --- a/drivers/mtd/spi-nor/sfdp.h
> +++ b/drivers/mtd/spi-nor/sfdp.h
> @@ -97,6 +97,7 @@ 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)
> 
>  struct sfdp_parameter_header {
>  	u8		id_lsb;

Reviewed-by: Michael Walle <michael@...le.cc>

-michael