From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 21 Apr 2010 03:42:18 -0400
Subject: [U-Boot] [PATCH] spi_flash: support old STMicro parts with RES
In-Reply-To: <1271830447-19221-1-git-send-email-thomas@wytron.com.tw>
References: <1271830447-19221-1-git-send-email-thomas@wytron.com.tw>
Message-ID: <201004210342.19832.vapier@gentoo.org>
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On Wednesday 21 April 2010 02:14:07 Thomas Chou wrote:
> --- a/drivers/mtd/spi/spi_flash.c
> +++ b/drivers/mtd/spi/spi_flash.c
> @@ -120,6 +120,18 @@ struct spi_flash *spi_flash_probe(unsigned int bus,
> unsigned int cs, ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode,
> sizeof(idcode));
>  	if (ret)
>  		goto err_read_id;
> +#ifdef CONFIG_SPI_FLASH_STMICRO
> +	if (idcode[0] == 0xff) { /* try RES to read electronic id */
> +		ret = spi_flash_cmd(spi, 0xab, &idcode, sizeof(idcode));
> +		if (ret)
> +			goto err_read_id;
> +		if ((idcode[3] & 0xf0) == 0x10) {
> +			idcode[0] = 0x20;
> +			idcode[1] = 0x20;
> +			idcode[2] = idcode[3] + 1;
> +		}
> +	}
> +#endif

please move this logic to stmicro's probe function to keep the common code 
clear of such cruft.
-mike
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