ASoC: Provide per widget type callback when executing DAPM sequences

Many modern devices have features such as DC servos which take time to start.
Currently these are handled by per-widget events but this makes it difficult
to paralleise operations on multiple widgets, meaning delays can end up
being needlessly serialised. By providing a callback to drivers when all
widgets of a given type have been handled during a DAPM sequence the core
allows drivers to start operations separately and wait for them to complete
much more simply.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

2 files changed, 16 insertions, 1 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 9e68984423b2..b0e7689159c1 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3496,6 +3496,7 @@ int snd_soc_register_codec(struct device *dev,
         codec->dapm.bias_level = SND_SOC_BIAS_OFF;
         codec->dapm.dev = dev;
         codec->dapm.codec = codec;
+        codec->dapm.seq_notifier = codec_drv->seq_notifier;
         codec->dev = dev;
         codec->driver = codec_drv;
         codec->num_dai = num_dai;
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index eb7436c7acad..37b376f4c75d 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -878,7 +878,7 @@ static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
         int cur_subseq = -1;
         int cur_reg = SND_SOC_NOPM;
         struct snd_soc_dapm_context *cur_dapm = NULL;
-        int ret;
+        int ret, i;
         int *sort;
 
         if (power_up)
@@ -895,6 +895,13 @@ static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
                         if (!list_empty(&pending))
                                 dapm_seq_run_coalesced(cur_dapm, &pending);
 
+                        if (cur_dapm && cur_dapm->seq_notifier) {
+                                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
+                                        if (sort[i] == cur_sort)
+                                                cur_dapm->seq_notifier(cur_dapm,
+                                                                       i);
+                        }
+
                         INIT_LIST_HEAD(&pending);
                         cur_sort = -1;
                         cur_subseq = -1;
@@ -956,6 +963,13 @@ static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
 
         if (!list_empty(&pending))
                 dapm_seq_run_coalesced(dapm, &pending);
+
+        if (cur_dapm && cur_dapm->seq_notifier) {
+                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
+                        if (sort[i] == cur_sort)
+                                cur_dapm->seq_notifier(cur_dapm,
+                                                       i);
+        }
 }
 
 static void dapm_widget_update(struct snd_soc_dapm_context *dapm)