Re: [PATCH 7/7] smm911x: check if the device is ready before using it

[Sascha Hauer <s.hauer@pengutronix.de>]

On Wed, Aug 29, 2012 at 07:06:18AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> poll the READY bit in PMT_CTRL. Any other access to the device is
> forbidden while this bit isn't set. Try for 100ms
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  drivers/net/smc911x.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
> index cfcd83f..3695d32 100644
> --- a/drivers/net/smc911x.c
> +++ b/drivers/net/smc911x.c
> @@ -422,6 +422,7 @@ static int smc911x_probe(struct device_d *dev)
>  	uint32_t val;
>  	int is_32bit;
>  	struct smc911x_plat *pdata = dev->platform_data;
> +	unsigned int to = 100;
>  
>  	priv = xzalloc(sizeof(*priv));
>  	is_32bit = dev->resource[0].flags & IORESOURCE_MEM_TYPE_MASK;
> @@ -452,6 +453,17 @@ static int smc911x_probe(struct device_d *dev)
>  		}
>  	}
>  
> +	/*
> +	 * poll the READY bit in PMT_CTRL. Any other access to the device is
> +	 * forbidden while this bit isn't set. Try for 100ms
> +	 */
> +	while (!(smc911x_reg_read(priv, PMT_CTRL) & PMT_CTRL_READY) && --to)
> +		udelay(1000);

please use a regular timeout loop

Sascha


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