ASoC: Don't mark the outputs of supplies as dirty on state changes

The whole point of supply widgets is that they aren't inputs to their
sinks so a state change in a supply should never affect the state of the
widget being supplied and we don't need to mark them as dirty.

           Power    Path   Neighbour
Before:    69       727    905
After:     63       607    731

This is particularly useful where supplies affect large portions of the
chip (eg, a bandgap supplying the analogue sections).

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

1 files changed, 11 insertions, 4 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index c39146d435e2..cbca1ddb6619 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1260,11 +1260,18 @@ static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
                                                    path->connect);
                 }
         }
-        list_for_each_entry(path, &w->sinks, list_source) {
-                if (path->sink) {
-                        dapm_widget_set_peer_power(path->sink, power,
-                                                   path->connect);
+        switch (w->id) {
+        case snd_soc_dapm_supply:
+                /* Supplies can't affect their outputs, only their inputs */
+                break;
+        default:
+                list_for_each_entry(path, &w->sinks, list_source) {
+                        if (path->sink) {
+                                dapm_widget_set_peer_power(path->sink, power,
+                                                           path->connect);
+                        }
                 }
+                break;
         }
 
         if (power)