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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 v3] mtd: parsers: bcm63xx: simplify CFE detection
Date: Mon, 15 Jun 2020 10:54:33 +0200
Message-ID: <20200615105433.56fb5310@xps13> (raw)
In-Reply-To: <20200612073549.1658336-1-noltari@gmail.com>

Hi Álvaro,

Álvaro Fernández Rojas <noltari@gmail.com> wrote on Fri, 12 Jun 2020
09:35:49 +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>
> ---
>  v3: keep COMPILE_TEST compatibility by adding a new function that only checks
>      fw_arg3 when CONFIG_MIPS is defined.
>  v2: use CFE_EPTSEAL definition and avoid using an additional function.
> 
>  drivers/mtd/parsers/bcm63xxpart.c | 34 +++++++++++--------------------
>  1 file changed, 12 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/mtd/parsers/bcm63xxpart.c b/drivers/mtd/parsers/bcm63xxpart.c
> index 78f90c6c18fd..c514c04789af 100644
> --- a/drivers/mtd/parsers/bcm63xxpart.c
> +++ b/drivers/mtd/parsers/bcm63xxpart.c
> @@ -22,6 +22,11 @@
>  #include <linux/mtd/partitions.h>
>  #include <linux/of.h>
>  
> +#ifdef CONFIG_MIPS
> +#include <asm/bootinfo.h>
> +#include <asm/fw/cfe/cfe_api.h>
> +#endif /* CONFIG_MIPS */
> +
>  #define BCM963XX_CFE_BLOCK_SIZE		SZ_64K	/* always at least 64KiB */
>  
>  #define BCM963XX_CFE_MAGIC_OFFSET	0x4e0
> @@ -32,28 +37,13 @@
>  #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)
> +static inline int bcm63xx_detect_cfe(void)
>  {
> -	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);
> +#ifdef CONFIG_MIPS
> +	return (fw_arg3 == CFE_EPTSEAL);
> +#else
> +	return 0;
> +#endif /* CONFIG_MIPS */

What about:

	ret = 0;

#ifdef CONFIG_MIPS
	ret = (fw_arg3 == CFE_EPTSEAL)
#endif

	return ret;

This is for shortening the conditional part.

>  }
>  
>  static int bcm63xx_read_nvram(struct mtd_info *master,
> @@ -138,7 +128,7 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
>  	struct bcm963xx_nvram *nvram = NULL;
>  	int ret;
>  
> -	if (bcm63xx_detect_cfe(master))
> +	if (!bcm63xx_detect_cfe())
>  		return -EINVAL;
>  
>  	nvram = vzalloc(sizeof(*nvram));

Thanks,
Miquèl

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Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-08  9:40 [PATCH 0/2] " Álvaro Fernández Rojas
2020-06-08  9:40 ` [PATCH 1/2] MIPS: BCM63xx: add helper function to detect CFE Álvaro Fernández Rojas
2020-06-08  9:40 ` [PATCH 2/2] mtd: parsers: bcm63xx: simplify CFE detection Álvaro Fernández Rojas
2020-06-08 16:06 ` [PATCH v2] " Álvaro Fernández Rojas
2020-06-11  7:55   ` Miquel Raynal
2020-06-11 15:16     ` Álvaro Fernández Rojas
2020-06-11 15:42       ` Florian Fainelli
2020-06-11 15:46         ` Miquel Raynal
2020-06-11 16:14         ` Álvaro Fernández Rojas
2020-06-12  7:02           ` Miquel Raynal
2020-06-12  7:30             ` Álvaro Fernández Rojas
2020-06-12  7:33               ` Miquel Raynal
2020-06-12  7:37                 ` Álvaro Fernández Rojas
2020-06-12  7:35   ` [PATCH v3] " Álvaro Fernández Rojas
2020-06-15  8:54     ` Miquel Raynal [this message]
2020-06-15  9:17     ` [PATCH v4] " Álvaro Fernández Rojas
2020-06-15 16:30       ` Florian Fainelli
2020-06-15 17:38       ` Miquel Raynal
2020-08-14  8:56       ` Guenter Roeck
2020-09-22  3:18         ` Naresh Kamboju
2020-09-22  3:26           ` Guenter Roeck
2020-09-28 14:16             ` Miquel Raynal
2020-09-28 19:35               ` Florian Fainelli
2020-09-29 17:27               ` [PATCH] mtd: parsers: bcm63xx: Do not make it modular Florian Fainelli
2020-10-02  7:15                 ` Miquel Raynal
2020-10-11 14:14                 ` Guenter Roeck
2020-10-12  7:04                   ` Miquel Raynal
2020-10-12 13:24                     ` Guenter Roeck

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