On Thu, Jan 30, 2014 at 12:08:06PM +0100, Jean-Francois Moine wrote:

> -	if (format == p->audio_format) {
> +	if (format == p->audio_format &&
> +	    params_format(params) == priv->audio_sample_format) {
>  		reg_write(priv, REG_ENA_AP, p->audio_cfg);
>  		return;

I find the above confusing and probably deserving of a comment
explaining the logic.  I think it's trying to skip noop configuration
updates?

>  	}
>  	p->audio_format = format;
> +	priv->audio_sample_format = params_format(params);

You should be using params_width() for the number of bits per sample.