Re: [PATCH 4/6] ASoC: wm5110: Add support for audio trace firmware

[Charles Keepax <ckeepax@opensource.wolfsonmicro.com>]

On Fri, Jan 29, 2016 at 12:34:22AM +0100, Mark Brown wrote:
> On Thu, Jan 21, 2016 at 05:53:00PM +0000, Charles Keepax wrote:
> 
> > @@ -2163,6 +2187,8 @@ static int wm5110_open(struct snd_compr_stream *stream)
> >  
> >  	if (strcmp(rtd->codec_dai->name, "wm5110-dsp-voicectrl") == 0) {
> >  		n_adsp = 2;
> > +	} else if (strcmp(rtd->codec_dai->name, "wm5110-dsp-trace") == 0) {
> > +		n_adsp = 0;
> >  	} else {
> >  		dev_err(arizona->dev,
> >  			"No suitable compressed stream for DAI '%s'\n",
> 
> I'm a bit unclear on how exactly we're ensuring that the relevant
> firmware is loaded?

So this code is basically just working out which DSP core we
should be opening (at the moment this is fixed a DAI coresponds
to a particular DSP core). At the bottom of the function we call
wm_adsp_compr_open which will check that the firmware supports
compressed operation in the correct direction and will lock out
changes of firmware until compr_free is called.

Thanks,
Charles