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Commit 62e5f676 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Mark Brown
Browse files

ASoC: Set SNDRV_PCM_INFO_JOINT_DUPLEX for PCMs with symmetry constraints 



If there are symmetry constraints between the playback and the capture channel
set the SNDRV_PCM_INFO_JOINT_DUPLEX flag to let userspace know about this.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent d3383420

sound/soc/soc-pcm.c

+18 −0
Original line number Diff line number Diff line
@@ -180,6 +180,21 @@ static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream, 
	return 0;

}



static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;

	struct snd_soc_dai_driver *codec_driver = rtd->codec_dai->driver;

	struct snd_soc_dai_link *link = rtd->dai_link;



	return cpu_driver->symmetric_rates || codec_driver->symmetric_rates ||

		link->symmetric_rates || cpu_driver->symmetric_channels ||

		codec_driver->symmetric_channels || link->symmetric_channels ||

		cpu_driver->symmetric_samplebits ||

		codec_driver->symmetric_samplebits ||

		link->symmetric_samplebits;

}



/*

 * List of sample sizes that might go over the bus for parameter

 * application.  There ought to be a wildcard sample size for things
@@ -309,6 +324,9 @@ static int soc_pcm_open(struct snd_pcm_substream *substream) 
			&cpu_dai_drv->capture);

	}



	if (soc_pcm_has_symmetry(substream))

		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;



	ret = -EINVAL;

	snd_pcm_limit_hw_rates(runtime);

	if (!runtime->hw.rates) {