ASoC: dapm: Only clear paths we've walked
When clearing the walked flags there is no need to clear all paths, we
only need to clear the paths we actually walked. This means we can split
dapm_clear_walk() into input and output versions and rather than going
through all DAPM paths we can recurse down the path until we encounter
paths we have not yet walked.
This reduces the number of operations we need to perform and improves
cache locality.
[Pulled out of the vendor tree that the patch was originally generated
for by me, any bugs were introduced in that process -- broonie]
Signed-off-by: Ryo Tsutsui <Ryo.Tsutsui@wolfsonmicro.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 7a61b5c..68acec6 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -707,14 +707,33 @@
}
/* reset 'walked' bit for each dapm path */
-static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
+static void dapm_clear_walk_output(struct snd_soc_dapm_context *dapm,
+ struct list_head *sink)
{
struct snd_soc_dapm_path *p;
- list_for_each_entry(p, &dapm->card->paths, list)
- p->walked = 0;
+ list_for_each_entry(p, sink, list_source) {
+ if (p->walked) {
+ p->walked = 0;
+ dapm_clear_walk_output(dapm, &p->sink->sinks);
+ }
+ }
}
+static void dapm_clear_walk_input(struct snd_soc_dapm_context *dapm,
+ struct list_head *source)
+{
+ struct snd_soc_dapm_path *p;
+
+ list_for_each_entry(p, source, list_sink) {
+ if (p->walked) {
+ p->walked = 0;
+ dapm_clear_walk_input(dapm, &p->source->sources);
+ }
+ }
+}
+
+
/* We implement power down on suspend by checking the power state of
* the ALSA card - when we are suspending the ALSA state for the card
* is set to D3.
@@ -983,13 +1002,17 @@
mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
dapm_reset(card);
- if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
paths = is_connected_output_ep(dai->playback_widget, list);
- else
+ dapm_clear_walk_output(&card->dapm,
+ &dai->playback_widget->sinks);
+ } else {
paths = is_connected_input_ep(dai->capture_widget, list);
+ dapm_clear_walk_input(&card->dapm,
+ &dai->capture_widget->sources);
+ }
trace_snd_soc_dapm_connected(paths, stream);
- dapm_clear_walk(&card->dapm);
mutex_unlock(&card->dapm_mutex);
return paths;
@@ -1092,9 +1115,9 @@
DAPM_UPDATE_STAT(w, power_checks);
in = is_connected_input_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_input(w->dapm, &w->sources);
out = is_connected_output_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_output(w->dapm, &w->sinks);
return out != 0 && in != 0;
}
@@ -1117,7 +1140,7 @@
if (w->active) {
in = is_connected_input_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_input(w->dapm, &w->sources);
return in != 0;
} else {
return dapm_generic_check_power(w);
@@ -1133,7 +1156,7 @@
if (w->active) {
out = is_connected_output_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_output(w->dapm, &w->sinks);
return out != 0;
} else {
return dapm_generic_check_power(w);
@@ -1745,9 +1768,9 @@
return -ENOMEM;
in = is_connected_input_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_input(w->dapm, &w->sources);
out = is_connected_output_ep(w, NULL);
- dapm_clear_walk(w->dapm);
+ dapm_clear_walk_output(w->dapm, &w->sinks);
ret = snprintf(buf, PAGE_SIZE, "%s: %s%s in %d out %d",
w->name, w->power ? "On" : "Off",