ASoC: dapm: Provide early event callbacks for power up and down

Some devices may benefit from being able to start some parts of the widget
power up/down sequence earlier on in the sequence than the point at which
the final power state is committed. Support these by providing events which
are called before any power state changes are done.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index d4609029f014..f4f85dd1cd97 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -311,6 +311,8 @@ struct device;
 #define SND_SOC_DAPM_POST_PMD   0x8             /* after widget power down */
 #define SND_SOC_DAPM_PRE_REG    0x10    /* before audio path setup */
 #define SND_SOC_DAPM_POST_REG   0x20    /* after audio path setup */
+#define SND_SOC_DAPM_WILL_PMU   0x40    /* called at start of sequence */
+#define SND_SOC_DAPM_WILL_PMD   0x80    /* called at start of sequence */
 #define SND_SOC_DAPM_PRE_POST_PMD \
                                 (SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD)
 
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index a80c883bb8be..e4e5420de725 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1277,6 +1277,14 @@ static void dapm_seq_check_event(struct snd_soc_dapm_context *dapm,
                 ev_name = "POST_PMD";
                 power = 0;
                 break;
+        case SND_SOC_DAPM_WILL_PMU:
+                ev_name = "WILL_PMU";
+                power = 1;
+                break;
+        case SND_SOC_DAPM_WILL_PMD:
+                ev_name = "WILL_PMD";
+                power = 0;
+                break;
         default:
                 BUG();
                 return;
@@ -1737,6 +1745,14 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
                                         &async_domain);
         async_synchronize_full_domain(&async_domain);
 
+        list_for_each_entry(w, &down_list, list) {
+                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_WILL_PMD);
+        }
+
+        list_for_each_entry(w, &up_list, list) {
+                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_WILL_PMU);
+        }
+
         /* Power down widgets first; try to avoid amplifying pops. */
         dapm_seq_run(dapm, &down_list, event, false);