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Message-ID: <ac94e7628af971121921961fa4209683@walle.cc>
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
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