[alsa-devel] [PATCH] ASoC: Suppress early calls to snd_soc_dapm_sync()

[Mark Brown]

Ensure we only have one sync during the initial startup of the card by
making snd_soc_dapm_sync() a noop on non-instantiated cards. This avoids
any bounces due to things like jacks reporting their initial state on
partially initialised cards. The callers that don't also get called at
runtime should just be removed.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/soc-core.c |    1 +
 sound/soc/soc-dapm.c |    7 +++++++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 2a25076..b65e3d4 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1498,6 +1498,7 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
 #endif
 
 	card->instantiated = 1;
+	snd_soc_dapm_sync(&card->dapm);
 	mutex_unlock(&card->mutex);
 	return;
 
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 8711aab..e49c56d 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1845,6 +1845,13 @@ static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
  */
 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
 {
+	/*
+	 * Suppress early reports (eg, jacks syncing their state) to avoid
+	 * silly DAPM runs during card startup.
+	 */
+	if (!dapm->card || !dapm->card->instantiated)
+		return 0;
+
 	return dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
-- 
1.7.6.3