linux-kernel - Re: [RESEND PATCH v3 18/20] mtd: spi_nor: Introduce spi_nor_set_addr

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Date:   Tue, 27 Aug 2019 13:07:09 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     <Tudor.Ambarus@...rochip.com>, <boris.brezillon@...labora.com>,
        <marek.vasut@...il.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v3 18/20] mtd: spi_nor: Introduce
 spi_nor_set_addr_width()



On 26/08/19 5:39 PM, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Parsing of flash parameters were interleaved with setting of the
> nor addr width. Dedicate a function for setting nor addr width.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> ---

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

Regards
Vignesh

> v3: no changes
> 
>  drivers/mtd/spi-nor/spi-nor.c | 50 ++++++++++++++++++++++++++-----------------
>  1 file changed, 30 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index dcda96a20f6c..d13317d1f372 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -4739,6 +4739,33 @@ static const struct flash_info *spi_nor_match_id(const char *name)
>  	return NULL;
>  }
>  
> +static int spi_nor_set_addr_width(struct spi_nor *nor)
> +{
> +	if (nor->addr_width) {
> +		/* already configured from SFDP */
> +	} else if (nor->info->addr_width) {
> +		nor->addr_width = nor->info->addr_width;
> +	} else if (nor->mtd.size > 0x1000000) {
> +		/* enable 4-byte addressing if the device exceeds 16MiB */
> +		nor->addr_width = 4;
> +	} else {
> +		nor->addr_width = 3;
> +	}
> +
> +	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
> +		dev_err(nor->dev, "address width is too large: %u\n",
> +			nor->addr_width);
> +		return -EINVAL;
> +	}
> +
> +	/* Set 4byte opcodes when possible. */
> +	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
> +	    !(nor->flags & SNOR_F_HAS_4BAIT))
> +		spi_nor_set_4byte_opcodes(nor);
> +
> +	return 0;
> +}
> +
>  int spi_nor_scan(struct spi_nor *nor, const char *name,
>  		 const struct spi_nor_hwcaps *hwcaps)
>  {
> @@ -4885,29 +4912,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>  	if (ret)
>  		return ret;
>  
> -	if (nor->addr_width) {
> -		/* already configured from SFDP */
> -	} else if (info->addr_width) {
> -		nor->addr_width = info->addr_width;
> -	} else if (mtd->size > 0x1000000) {
> -		/* enable 4-byte addressing if the device exceeds 16MiB */
> -		nor->addr_width = 4;
> -	} else {
> -		nor->addr_width = 3;
> -	}
> -
>  	if (info->flags & SPI_NOR_4B_OPCODES)
>  		nor->flags |= SNOR_F_4B_OPCODES;
>  
> -	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
> -	    !(nor->flags & SNOR_F_HAS_4BAIT))
> -		spi_nor_set_4byte_opcodes(nor);
> -
> -	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
> -		dev_err(dev, "address width is too large: %u\n",
> -			nor->addr_width);
> -		return -EINVAL;
> -	}
> +	ret = spi_nor_set_addr_width(nor);
> +	if (ret)
> +		return ret;
>  
>  	/* Send all the required SPI flash commands to initialize device */
>  	ret = spi_nor_init(nor);
> 

-- 
Regards
Vignesh