snd_hdac_dsp_prepare
int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
err = snd_hdac_dsp_prepare(hstr, format, byte_size, bufp);
EXPORT_SYMBOL_GPL(snd_hdac_dsp_prepare);
ret = snd_hdac_dsp_prepare(hdac_stream(host_stream), sd_fmt, fw->size, &dmab);
ret = snd_hdac_dsp_prepare(hstream, sdfmt, fw->size, &dmab);
ret = snd_hdac_dsp_prepare(stream, sdfmt, lib->size, &dmab);