[alsa-devel] [PATCH for 2.6.40] ASoC: Fix power down for widgetless per-card DAPM context case

Jarkko Nikula jhnikula at gmail.com
Thu May 26 15:32:18 CEST 2011

Commit 52ba67b ("ASoC: Force all DAPM contexts into the same bias state")
powers up all the DAPM contexts in a card if any DAPM context becomes
active. Unfortunately power down newer happens if per-card DAPM context
doesn't have any widgets.

Reason for this is that power state of per-card DAPM context without
widgets is never cleared and thus all the DAPM contexts remain permanently
active. Test for widgetless calling DAPM context in dapm_power_widgets()
doesn't work for per-card DAPM context since power change is never
originating from widgetless per-card DAPM context.

Fix this by pre-clearing power state flag of non-codec DAPM context at the
beginning of power sequence.

Signed-off-by: Jarkko Nikula <jhnikula at gmail.com>
 sound/soc/soc-dapm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 456617e..999bb08 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1110,7 +1110,7 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
 	list_for_each_entry(d, &card->dapm_list, list)
-		if (d->n_widgets)
+		if (d->n_widgets || d->codec == NULL)
 			d->dev_power = 0;
 	/* Check which widgets we need to power and store them in

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