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

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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>
This commit is contained in:
Mark Brown 2013-02-25 15:14:19 +00:00
parent 10e8aa9af1
commit 8011412999
2 changed files with 18 additions and 0 deletions
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2
include/sound/soc-dapm.h
View file

@ -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)

16
sound/soc/soc-dapm.c
View file

@ -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);