[alsa-devel] [PATCH 6/7] ASoC: Coalesce power updates for PGAs

[Mark Brown]

Handle gain ramping for PGAs so we can coalesce their power updates too.
This is not ideal since we can't cope properly with gain ramping for
stereo paths but that was the case without coalescing and gain ramping
is relatively infrequently used so the effects are limited.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/soc-dapm.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 3fc791c..7299ce4 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -786,6 +786,10 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec,
 				pr_err("%s: pre event failed: %d\n",
 				       w->name, ret);
 		}
+
+		/* Lower PGA volume to reduce pops */
+		if (w->id == snd_soc_dapm_pga && !w->power)
+			dapm_set_pga(w, w->power);
 	}
 
 	if (reg >= 0) {
@@ -797,6 +801,10 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec,
 	}
 
 	list_for_each_entry(w, pending, power_list) {
+		/* Raise PGA volume to reduce pops */
+		if (w->id == snd_soc_dapm_pga && w->power)
+			dapm_set_pga(w, w->power);
+
 		/* power up post event */
 		if (w->power && w->event &&
 		    (w->event_flags & SND_SOC_DAPM_POST_PMU)) {
@@ -886,8 +894,6 @@ static void dapm_seq_run(struct snd_soc_codec *codec, struct list_head *list,
 		case snd_soc_dapm_line:
 		case snd_soc_dapm_spk:
 			/* No register support currently */
-		case snd_soc_dapm_pga:
-			/* Don't coalsece these yet due to gain ramping */
 			ret = dapm_generic_apply_power(w);
 			break;
 
-- 
1.6.3.1