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Subject: Re: [RESEND PATCH v3 11/20] mtd: spi-nor: Add post_sfdp() hook to
 tweak flash config
To:     <Tudor.Ambarus@microchip.com>, <boris.brezillon@collabora.com>,
        <marek.vasut@gmail.com>, <miquel.raynal@bootlin.com>,
        <richard@nod.at>, <linux-mtd@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
References: <20190826120821.16351-1-tudor.ambarus@microchip.com>
 <20190826120821.16351-12-tudor.ambarus@microchip.com>
From:   Vignesh Raghavendra <vigneshr@ti.com>
Message-ID: <0b7a1322-6a8a-b1df-7039-95e651b869b9@ti.com>
Date:   Tue, 27 Aug 2019 12:38:32 +0530
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On 26/08/19 5:38 PM, Tudor.Ambarus@microchip.com wrote:
> From: Boris Brezillon <boris.brezillon@bootlin.com>
> 
> SFDP tables are sometimes wrong and we need a way to override the
> config chosen by the SFDP parsing logic without discarding all of it.
> 
> Add a new hook called after the SFDP parsing has taken place to deal
> with such problems.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---

Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>

Regards
Vignesh

> v3: no changes, rebase on previous commits
> 
>  drivers/mtd/spi-nor/spi-nor.c | 33 ++++++++++++++++++++++++++++++++-
>  1 file changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 3f997797fa9d..b8caf5171ff5 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -158,6 +158,11 @@ struct sfdp_bfpt {
>   *                flash parameters when information provided by the flash_info
>   *                table is incomplete or wrong.
>   * @post_bfpt: called after the BFPT table has been parsed
> + * @post_sfdp: called after SFDP has been parsed (is also called for SPI NORs
> + *             that do not support RDSFDP). Typically used to tweak various
> + *             parameters that could not be extracted by other means (i.e.
> + *             when information provided by the SFDP/flash_info tables are
> + *             incomplete or wrong).
>   *
>   * Those hooks can be used to tweak the SPI NOR configuration when the SFDP
>   * table is broken or not available.
> @@ -168,6 +173,7 @@ struct spi_nor_fixups {
>  			 const struct sfdp_parameter_header *bfpt_header,
>  			 const struct sfdp_bfpt *bfpt,
>  			 struct spi_nor_flash_parameter *params);
> +	void (*post_sfdp)(struct spi_nor *nor);
>  };
>  
>  struct flash_info {
> @@ -4299,6 +4305,22 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
>  }
>  
>  /**
> + * spi_nor_post_sfdp_fixups() - Updates the flash's parameters and settings
> + * after SFDP has been parsed (is also called for SPI NORs that do not
> + * support RDSFDP).
> + * @nor:	pointer to a 'struct spi_nor'
> + *
> + * Typically used to tweak various parameters that could not be extracted by
> + * other means (i.e. when information provided by the SFDP/flash_info tables
> + * are incomplete or wrong).
> + */
> +static void spi_nor_post_sfdp_fixups(struct spi_nor *nor)
> +{
> +	if (nor->info->fixups && nor->info->fixups->post_sfdp)
> +		nor->info->fixups->post_sfdp(nor);
> +}
> +
> +/**
>   * spi_nor_late_init_params() - Late initialization of default flash parameters.
>   * @nor:	pointer to a 'struct spi_nor'
>   *
> @@ -4341,7 +4363,14 @@ static void spi_nor_late_init_params(struct spi_nor *nor)
>   *    flash parameters and settings imediately after parsing the Basic Flash
>   *    Parameter Table.
>   *
> - * 4/ Late default flash parameters initialization, used when the
> + * which can be overwritten by:
> + * 4/ Post SFDP flash parameters initialization. Used to tweak various
> + *    parameters that could not be extracted by other means (i.e. when
> + *    information provided by the SFDP/flash_info tables are incomplete or
> + *    wrong).
> + *		spi_nor_post_sfdp_fixups()
> + *
> + * 5/ Late default flash parameters initialization, used when the
>   * ->default_init() hook or the SFDP parser do not set specific params.
>   *		spi_nor_late_init_params()
>   */
> @@ -4355,6 +4384,8 @@ static void spi_nor_init_params(struct spi_nor *nor)
>  	    !(nor->info->flags & SPI_NOR_SKIP_SFDP))
>  		spi_nor_sfdp_init_params(nor);
>  
> +	spi_nor_post_sfdp_fixups(nor);
> +
>  	spi_nor_late_init_params(nor);
>  }
>  
> 

-- 
Regards
Vignesh