ASoC: Only run power_check() on a widget once per run

Some widgets will get power_check() run on them more than once during a
DAPM run, most commonly due to supply widgets checking to see if their
consumers are powered up. It's wasteful to do this so cache the result
of power_check() during a run. For one system I tested this on I got an
improvement of:

           Power    Path   Neighbour
Before:    106      970    1186
After:     69       727    905

from this.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index c080635b3c35..e2853daf802c 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -473,6 +473,8 @@ struct snd_soc_dapm_widget {
         unsigned char ext:1;                    /* has external widgets */
         unsigned char force:1;                  /* force state */
         unsigned char ignore_suspend:1;         /* kept enabled over suspend */
+        unsigned char new_power:1;              /* power from this run */
+        unsigned char power_checked:1;          /* power checked this run */
         int subseq;                             /* sort within widget type */
 
         int (*power_check)(struct snd_soc_dapm_widget *w);