[alsa-devel] [PATCH v2 2/7] ALSA: hda - add generic functions to set hdac stream params

[Takashi Iwai]

At Fri, 17 Apr 2015 14:43:15 +0530,
Vinod Koul wrote:
> 
> From: Jeeja KP <jeeja.kp at intel.com>
> 
> This will be used by hda controller driver to
> setup stream params in prepare. This function will
> setup the bdl and periods.

OK, it's fine to add this function if soc-hda driver needs it too.
But please put the kerneldoc comment to the function, too.  Then I can
apply this patch even before other patches.


thanks,

Takashi

> 
> Signed-off-by: Jeeja KP <jeeja.kp at intel.com>
> Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
> Signed-off-by: Vinod Koul <vinod.koul at intel.com>
> ---
>  include/sound/hdaudio.h |    2 ++
>  sound/hda/hdac_stream.c |   31 +++++++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
> index b871f00bb185..227e71956c35 100644
> --- a/include/sound/hdaudio.h
> +++ b/include/sound/hdaudio.h
> @@ -417,6 +417,8 @@ void snd_hdac_stream_release(struct hdac_stream *azx_dev);
>  int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
>  void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
>  int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
> +int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
> +				unsigned int format_val);
>  void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
>  void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
>  void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
> diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
> index 8bd67a824b5e..618e742f527f 100644
> --- a/sound/hda/hdac_stream.c
> +++ b/sound/hda/hdac_stream.c
> @@ -393,6 +393,37 @@ int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev)
>  }
>  EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods);
>  
> +int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
> +				 unsigned int format_val)
> +{
> +
> +	unsigned int bufsize, period_bytes;
> +	struct snd_pcm_substream *substream = azx_dev->substream;
> +	struct snd_pcm_runtime *runtime;
> +	int err;
> +
> +	if (!substream)
> +		return -EINVAL;
> +	runtime = substream->runtime;
> +	bufsize = snd_pcm_lib_buffer_bytes(substream);
> +	period_bytes = snd_pcm_lib_period_bytes(substream);
> +
> +	if (bufsize != azx_dev->bufsize ||
> +	    period_bytes != azx_dev->period_bytes ||
> +	    format_val != azx_dev->format_val ||
> +	    runtime->no_period_wakeup != azx_dev->no_period_wakeup) {
> +		azx_dev->bufsize = bufsize;
> +		azx_dev->period_bytes = period_bytes;
> +		azx_dev->format_val = format_val;
> +		azx_dev->no_period_wakeup = runtime->no_period_wakeup;
> +		err = snd_hdac_stream_setup_periods(azx_dev);
> +		if (err < 0)
> +			return err;
> +	}
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(snd_hdac_stream_set_params);
> +
>  static cycle_t azx_cc_read(const struct cyclecounter *cc)
>  {
>  	struct hdac_stream *azx_dev = container_of(cc, struct hdac_stream, cc);
> -- 
> 1.7.9.5
>