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ASoC: Warn rather than set a silly constraint when we can't do symmetry

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Symmetric rate configuration can fail if the second stream starting tries
to apply the symmetric constraint before the first stream has got far
enough to pick a rate. Rather than try to enforce a nonsensical rate of
0Hz log a warning and allow the application to carry on. Things might go
wrong later on but the user will know about it and there's unlikely to be
lasting damage.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2011-03-08 00:17:56 +00:00
parent 4f333b20ae
commit c4ef87867b
1 changed files with 10 additions and 0 deletions
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10
sound/soc/soc-core.c
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@ -505,6 +505,16 @@ static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream)
!rtd->dai_link->symmetric_rates)
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.
*/
if (!rtd->rate) {
dev_warn(&rtd->dev,
"Not enforcing symmetric_rates due to race\n");
return 0;
}
dev_dbg(&rtd->dev, "Symmetry forces %dHz rate\n", rtd->rate);
ret = snd_pcm_hw_constraint_minmax(substream->runtime,