ASoC: Do DAPM power checks only for widgets changed since last run

In order to reduce the number of DAPM power checks we run keep a list of
widgets which have been changed since the last DAPM run and iterate over
that rather than the full widget list. Whenever we change the power state
for a widget we add all the source and sink widgets it has to the dirty
list, ensuring that all widgets in the path are checked.

This covers more widgets than we need to as some of the neighbour widgets
won't be connected but it's simpler as a first step. On one system I tried
this gave:

           Power    Path   Neighbour
Before:    207      1939   2461
After:     114      1066   1327

which seems useful.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 9d0524a3a7f8..8ab1cfed1067 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -826,6 +826,7 @@ struct snd_soc_card {
         struct list_head widgets;
         struct list_head paths;
         struct list_head dapm_list;
+        struct list_head dapm_dirty;
 
         /* Generic DAPM context for the card */
         struct snd_soc_dapm_context dapm;