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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-01-19 22:49:43 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-01-21 12:04:08 +0000
commita96ca3387382498ec8b501db5acef3ed9eb1bd36 (patch)
tree3bc8d76f8796b0e555585802576fc2fed574587a /include/sound/soc.h
parentb91b8fa02482a5a18f598ee5d2cd42970051731b (diff)
downloadop-kernel-dev-a96ca3387382498ec8b501db5acef3ed9eb1bd36.zip
op-kernel-dev-a96ca3387382498ec8b501db5acef3ed9eb1bd36.tar.gz
ASoC: Support turning off bias when the CODEC is idle
Currently ASoC always maintains the bias of the CODEC while the system is active. With older mobile CODECs this is required since the outputs are referenced to a non-zero voltage and enabling or disabling this voltage without audible pops or clicks in the output takes too long to do when starting or stopping audio. As a result of features such as ground referenced outputs and class D speaker drivers current generation devices are able to power on and off much more quickly without these system level issues so provide a new flag idle_bias_off in snd_soc_codec which will cause the core to turn off the CODEC bias. The distinction between STANDBY and OFF is still maintained. This is partly for consistency but also allows for potential future extensions such as per-machine overrides or deferring the bias removal. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'include/sound/soc.h')
-rw-r--r--include/sound/soc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 08909cc..a8768ea 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -405,6 +405,8 @@ struct snd_soc_codec {
short reg_cache_size;
short reg_cache_step;
+ unsigned int idle_bias_off:1; /* Use BIAS_OFF instead of STANDBY */
+
/* dapm */
u32 pop_time;
struct list_head dapm_widgets;
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