linux-kernel - Re: [PATCH v3 2/3] mtd: spi-nor: Add additional octal-mode flags to be checked during SFDP

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Date:   Thu, 01 Dec 2022 23:08:42 +0100
From:   Michael Walle <michael@...le.cc>
To:     Nathan Barrett-Morrison <nathan.morrison@...esys.com>
Cc:     greg.malysa@...esys.com,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <pratyush@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] mtd: spi-nor: Add additional octal-mode flags to
 be checked during SFDP

[In general, please post new versions after a reasonable
amount of time for reviews. Like a day or so.]

Am 2022-12-01 22:27, schrieb Nathan Barrett-Morrison:
> This adds some support for searching a chips SFDP table for:
> 
> read commands: 1S-8S-8S
> program commands: 1S-1S-8S, 1S-8S-8S
> 
> Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@...esys.com>
> ---
>  drivers/mtd/spi-nor/core.c | 8 ++++++++
>  drivers/mtd/spi-nor/core.h | 5 +++--
>  drivers/mtd/spi-nor/sfdp.c | 8 ++++++++
>  3 files changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index bee8fc4c9f07..2f882608abc6 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2359,6 +2359,13 @@ static void spi_nor_no_sfdp_init_params(struct
> spi_nor *nor)
>  					  SNOR_PROTO_1_1_8);
>  	}
> 
> +	if (no_sfdp_flags & SPI_NOR_OCTAL_READ_1_8_8) {
> +		params->hwcaps.mask |= SNOR_HWCAPS_READ_1_8_8;
> +		spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_1_8_8],
> +					  0, 16, SPINOR_OP_READ_1_8_8,
> +					  SNOR_PROTO_1_8_8);
> +	}

This should only be done for flashes which doesn't support
SFDP at all (see the comment for spi_nor_no_sfdp_init_params()).

Yours supports SFDP, has the correct flags in the
4BAIT table but doesn't have the 17th DWORD in the BFPT. I'm not
sure if this is correct or if it's a mistake in the SFDP of this
flash device.

If it's correct, we would need to somehow call
spi_nor_set_read_settings() in sfdp.c; but we don't know the
mode or wait clocks. If it's a mistake in the SFDP, we'd need
to add a fixup for this particular flash which sets the read
settings. I'd go with the second because we just haven't enough
information.

-michael

> +
>  	if (no_sfdp_flags & SPI_NOR_OCTAL_DTR_READ) {
>  		params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
>  		spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_8_8_8_DTR],
> @@ -2514,6 +2521,7 @@ static void
> spi_nor_init_params_deprecated(struct spi_nor *nor)
>  	if (nor->info->no_sfdp_flags & (SPI_NOR_DUAL_READ |
>  					SPI_NOR_QUAD_READ |
>  					SPI_NOR_OCTAL_READ |
> +					SPI_NOR_OCTAL_READ_1_8_8 |
>  					SPI_NOR_OCTAL_DTR_READ))
>  		spi_nor_sfdp_init_params_deprecated(nor);
>  }
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index 85b0cf254e97..7bc1cde049b7 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -514,8 +514,9 @@ struct flash_info {
>  #define SPI_NOR_DUAL_READ		BIT(3)
>  #define SPI_NOR_QUAD_READ		BIT(4)
>  #define SPI_NOR_OCTAL_READ		BIT(5)
> -#define SPI_NOR_OCTAL_DTR_READ		BIT(6)
> -#define SPI_NOR_OCTAL_DTR_PP		BIT(7)
> +#define SPI_NOR_OCTAL_READ_1_8_8	BIT(6)
> +#define SPI_NOR_OCTAL_DTR_READ		BIT(7)
> +#define SPI_NOR_OCTAL_DTR_PP		BIT(8)
> 
>  	u8 fixup_flags;
>  #define SPI_NOR_4B_OPCODES		BIT(0)
> diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
> index e4e87815ba94..e1b7547bf81e 100644
> --- a/drivers/mtd/spi-nor/sfdp.c
> +++ b/drivers/mtd/spi-nor/sfdp.c
> @@ -1089,6 +1089,14 @@ static int spi_nor_parse_4bait(struct spi_nor 
> *nor,
>  		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_4_4],
>  					SPINOR_OP_PP_1_4_4_4B,
>  					SNOR_PROTO_1_4_4);
> +	if (pp_hwcaps & SNOR_HWCAPS_PP_1_1_8)
> +		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_1_8],
> +					SPINOR_OP_PP_1_1_8_4B,
> +					SNOR_PROTO_1_1_8);
> +	if (pp_hwcaps & SNOR_HWCAPS_PP_1_8_8)
> +		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_8_8],
> +					SPINOR_OP_PP_1_8_8_4B,
> +					SNOR_PROTO_1_8_8);
> 
>  	for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
>  		if (erase_mask & BIT(i))