On Mon, Aug 17, 2009 at 07:22:34PM +0800, Shine Liu wrote:
> When I play a wav file using aplay, I found there's no sound. After some
> debug work, I noticed that the DAC power control bit keeps zero since
> the system started up.
Please try the patch below.
commit 6294523841a61cd1ad24f220daf6e73e9cc83184
Author: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon Aug 17 11:55:38 2009 +0100
ASoC: Fix handling of bias levels for non-DAPM codecs
If the system doesn't have any DAPM widgets then we can't use their
state to check if the bias level for the codec should be up.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index c68c204..4a21a5e 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -966,6 +966,22 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
}
}
+ /* If there are no DAPM widgets then try to figure out power from the
+ * event type.
+ */
+ if (list_empty(&codec->dapm_widgets)) {
+ switch (event) {
+ case SND_SOC_DAPM_STREAM_START:
+ case SND_SOC_DAPM_STREAM_RESUME:
+ sys_power = 1;
+ break;
+ case SND_SOC_DAPM_STREAM_NOP:
+ sys_power == codec->bias_level != SND_SOC_BIAS_STANDBY;
+ default:
+ break;
+ }
+ }
+
/* If we're changing to all on or all off then prepare */
if ((sys_power && codec->bias_level == SND_SOC_BIAS_STANDBY) ||
(!sys_power && codec->bias_level == SND_SOC_BIAS_ON)) {
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
