linux-kernel - Re: [PATCH 2/3] mtd: spi-nor: add support for Quad Page Program to no_sfdp

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Message-ID: <3a9877d0-3cc5-6452-764b-d07b38c72b00@microchip.com>
Date:   Mon, 18 Jul 2022 17:02:17 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <sudip.mukherjee@...ive.com>, <p.yadav@...com>, <michael@...le.cc>,
        <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>
CC:     <greentime.hu@...ive.com>, <jude.onyenegecha@...ive.com>,
        <william.salmon@...ive.com>, <adnan.chowdhury@...ive.com>,
        <ben.dooks@...ive.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mtd: spi-nor: add support for Quad Page Program to
 no_sfdp_flags

On 7/12/22 19:38, Sudip Mukherjee wrote:
> [You don't often get email from sudip.mukherjee@...ive.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Some flash chips which does not have a SFDP table can support Quad
> Input Page Program. Enable it in hwcaps if defined.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ive.com>
> ---
>  drivers/mtd/spi-nor/core.c | 5 +++++
>  drivers/mtd/spi-nor/core.h | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index e5f7691c5bd40..e299fc8fdd3d4 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2375,6 +2375,11 @@ static void spi_nor_no_sfdp_init_params(struct spi_nor *nor)
>                 spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_8_8_8_DTR],
>                                         SPINOR_OP_PP, SNOR_PROTO_8_8_8_DTR);
>         }
> +       if (no_sfdp_flags & SPI_NOR_QUAD_PP) {
> +               params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
> +               spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_1_1_4],
> +                                       SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4);
> +       }
> 
>         /*
>          * Sector Erase settings. Sort Erase Types in ascending order, with the
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index 58fbedc94080f..dde636bdb1a7c 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -462,6 +462,7 @@ struct spi_nor_fixups {
>   *   SPI_NOR_OCTAL_READ:      flash supports Octal Read.
>   *   SPI_NOR_OCTAL_DTR_READ:  flash supports octal DTR Read.
>   *   SPI_NOR_OCTAL_DTR_PP:    flash supports Octal DTR Page Program.
> + *   SPI_NOR_QUAD_PP:         flash supports Quad Input Page Program.

You don't need this flag if your flash supports the 4-byte Address
Instruction Table. Does you flash support it? Can you dump all the
SFDP tables, please?

Thanks,
ta
>   *
>   * @fixup_flags:    flags that indicate support that can be discovered via SFDP
>   *                  ideally, but can not be discovered for this particular flash
> @@ -509,6 +510,7 @@ struct flash_info {
>  #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_QUAD_PP                        BIT(8)
> 
>         u8 fixup_flags;
>  #define SPI_NOR_4B_OPCODES             BIT(0)
> --
> 2.30.2
>