[alsa-devel] [PATCH v2 1/1] ASoC: soc-core: check rate for symmetry only when pcm is active

[Liam Girdwood]

On 24/08/11 12:02, Dong Aisheng wrote:
> For the playback and record using different dai links,
> checking !rtd->rate for symmetry may not be accurate because that
> pcm may be acutually not running and the default new open rate is 0,
> then the warning message "Not enforcing symmetric_rates" will
> happen each time with running arecord | aplay.
> 
> Now we only check rate for symmetry when the pcm is really active
> which seems more sensible.
> 
> Signed-off-by: Dong Aisheng <b29396 at freescale.com>
> Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
> Cc: Liam Girdwood <lrg at ti.com>
> Cc: Sascha Hauer <s.hauer at pengutronix.de>

Acked-by: Liam Girdwood <lrg at ti.com>

> ---
>  include/sound/soc.h |    1 +
>  sound/soc/soc-pcm.c |    5 +++++
>  2 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/include/sound/soc.h b/include/sound/soc.h
> index 3fe658e..17970fd 100644
> --- a/include/sound/soc.h
> +++ b/include/sound/soc.h
> @@ -851,6 +851,7 @@ struct snd_soc_pcm_runtime  {
>  
>  	/* Symmetry data - only valid if symmetry is being enforced */
>  	unsigned int rate;
> +	unsigned int active;
>  	long pmdown_time;
>  
>  	/* runtime devices */
> diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
> index 1aee9fc..72a7b34 100644
> --- a/sound/soc/soc-pcm.c
> +++ b/sound/soc/soc-pcm.c
> @@ -39,6 +39,9 @@ static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream)
>  	    !rtd->dai_link->symmetric_rates)
>  		return 0;
>  
> +	if (!rtd->active)
> +		return 0;
> +
>  	/* This can happen if multiple streams are starting simultaneously -
>  	 * the second can need to get its constraints before the first has
>  	 * picked a rate.  Complain and allow the application to carry on.
> @@ -209,6 +212,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
>  	cpu_dai->active++;
>  	codec_dai->active++;
>  	rtd->codec->active++;
> +	rtd->active++;
>  	mutex_unlock(&rtd->pcm_mutex);
>  	return 0;
>  
> @@ -287,6 +291,7 @@ static int soc_pcm_close(struct snd_pcm_substream *substream)
>  	cpu_dai->active--;
>  	codec_dai->active--;
>  	codec->active--;
> +	rtd->active--;
>  
>  	if (!cpu_dai->active && !codec_dai->active)
>  		rtd->rate = 0;