Re: [PATCH v2] mtd: parsers: bcm63xx: simplify CFE detection

From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Álvaro Fernández Rojas" <noltari@gmail.com>
Cc: f.fainelli@gmail.com, vigneshr@ti.com, richard@nod.at,
	linus.walleij@linaro.org, linux-mips@vger.kernel.org,
	linux-kernel@vger.kernel.org, tsbogend@alpha.franken.de,
	bcm-kernel-feedback-list@broadcom.com, jonas.gorski@gmail.com,
	linux-mtd@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] mtd: parsers: bcm63xx: simplify CFE detection
Date: Thu, 11 Jun 2020 09:55:40 +0200	[thread overview]
Message-ID: <20200611095540.250184d2@xps13> (raw)
In-Reply-To: <20200608160649.3717152-1-noltari@gmail.com>

Hi Álvaro,

Álvaro Fernández Rojas <noltari@gmail.com> wrote on Mon,  8 Jun 2020
18:06:49 +0200:

> Instead of trying to parse CFE version string, which is customized by some
> vendors, let's just check that "CFE1" was passed on argument 3.
> 
> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
> Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
> ---
>  v2: use CFE_EPTSEAL definition and avoid using an additional funtion.
> 
>  drivers/mtd/parsers/bcm63xxpart.c | 29 ++++-------------------------
>  1 file changed, 4 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/mtd/parsers/bcm63xxpart.c b/drivers/mtd/parsers/bcm63xxpart.c
> index 78f90c6c18fd..493a75b2f266 100644
> --- a/drivers/mtd/parsers/bcm63xxpart.c
> +++ b/drivers/mtd/parsers/bcm63xxpart.c
> @@ -22,6 +22,9 @@
>  #include <linux/mtd/partitions.h>
>  #include <linux/of.h>
>  
> +#include <asm/bootinfo.h>
> +#include <asm/fw/cfe/cfe_api.h>

Are you sure both includes are needed?

I don't think it is a good habit to include asm/ headers, are you sure
there is not another header doing it just fine?

> +
>  #define BCM963XX_CFE_BLOCK_SIZE		SZ_64K	/* always at least 64KiB */
>  
>  #define BCM963XX_CFE_MAGIC_OFFSET	0x4e0
> @@ -32,30 +35,6 @@
>  #define STR_NULL_TERMINATE(x) \
>  	do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0)
>  
> -static int bcm63xx_detect_cfe(struct mtd_info *master)
> -{
> -	char buf[9];
> -	int ret;
> -	size_t retlen;
> -
> -	ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
> -		       (void *)buf);
> -	buf[retlen] = 0;
> -
> -	if (ret)
> -		return ret;
> -
> -	if (strncmp("cfe-v", buf, 5) == 0)
> -		return 0;
> -
> -	/* very old CFE's do not have the cfe-v string, so check for magic */
> -	ret = mtd_read(master, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen,
> -		       (void *)buf);
> -	buf[retlen] = 0;
> -
> -	return strncmp("CFE1CFE1", buf, 8);
> -}
> -
>  static int bcm63xx_read_nvram(struct mtd_info *master,
>  	struct bcm963xx_nvram *nvram)
>  {
> @@ -138,7 +117,7 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
>  	struct bcm963xx_nvram *nvram = NULL;
>  	int ret;
>  
> -	if (bcm63xx_detect_cfe(master))
> +	if (fw_arg3 != CFE_EPTSEAL)
>  		return -EINVAL;
>  
>  	nvram = vzalloc(sizeof(*nvram));

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