linux-kernel - Re: [PATCH v2 1/3] mtd: spi-nor: Bring flash params init together

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Message-ID: <20190825143912.7fccd9bd@collabora.com>
Date:   Sun, 25 Aug 2019 14:39:12 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     <Tudor.Ambarus@...rochip.com>
Cc:     <marek.vasut@...il.com>, <vigneshr@...com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] mtd: spi-nor: Bring flash params init together

On Sat, 24 Aug 2019 12:19:20 +0000
<Tudor.Ambarus@...rochip.com> wrote:

> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Bring all flash parameters default initialization in
> spi_nor_legacy_params_init().
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/mtd/spi-nor/spi-nor.c | 29 +++++++++++------------------
>  1 file changed, 11 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index e76c23d1c54a..7e6da0ace2c7 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -4469,6 +4469,7 @@ static void spi_nor_legacy_init_params(struct spi_nor *nor)
>  	struct spi_nor_flash_parameter *params = &nor->params;
>  	struct spi_nor_erase_map *map = &params->erase_map;
>  	const struct flash_info *info = nor->info;
> +	struct device_node *np = spi_nor_get_flash_node(nor);
>  	u8 i, erase_mask;
>  
>  	/* Initialize legacy flash parameters and settings. */
> @@ -4480,18 +4481,25 @@ static void spi_nor_legacy_init_params(struct spi_nor *nor)
>  	params->size = (u64)info->sector_size * info->n_sectors;
>  	params->page_size = info->page_size;
>  
> +	if (!(info->flags & SPI_NOR_NO_FR)) {
> +		/* Default to Fast Read for DT and non-DT platform devices. */
> +		params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> +
> +		/* Mask out Fast Read if not requested at DT instantiation. */
> +		if (np && !of_property_read_bool(np, "m25p,fast-read"))
> +			params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> +	}
> +
>  	/* (Fast) Read settings. */
>  	params->hwcaps.mask |= SNOR_HWCAPS_READ;
>  	spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ],
>  				  0, 0, SPINOR_OP_READ,
>  				  SNOR_PROTO_1_1_1);
>  
> -	if (!(info->flags & SPI_NOR_NO_FR)) {
> -		params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> +	if (params->hwcaps.mask & SNOR_HWCAPS_READ_FAST)
>  		spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_FAST],
>  					  0, 8, SPINOR_OP_READ_FAST,
>  					  SNOR_PROTO_1_1_1);
> -	}
>  
>  	if (info->flags & SPI_NOR_DUAL_READ) {
>  		params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
> @@ -4897,24 +4905,9 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>  	nor->page_size = params->page_size;
>  	mtd->writebufsize = nor->page_size;
>  
> -	if (np) {
> -		/* If we were instantiated by DT, use it */
> -		if (of_property_read_bool(np, "m25p,fast-read"))
> -			params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> -		else
> -			params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> -	} else {
> -		/* If we weren't instantiated by DT, default to fast-read */
> -		params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> -	}
> -
>  	if (of_property_read_bool(np, "broken-flash-reset"))
>  		nor->flags |= SNOR_F_BROKEN_RESET;
>  
> -	/* Some devices cannot do fast-read, no matter what DT tells us */
> -	if (info->flags & SPI_NOR_NO_FR)
> -		params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> -
>  	/*
>  	 * Configure the SPI memory:
>  	 * - select op codes for (Fast) Read, Page Program and Sector Erase.