[PATCH 1/5] ASoC: wm8731: rework power management
From: Nicolas Ferre <hidden>
Date: 2011-06-29 16:53:53
Also in:
alsa-devel, lkml
Subsystem:
sound, sound - soc layer / dynamic audio power management (asoc), the rest, wolfson microelectronics drivers · Maintainers:
Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds
- preserve crystal oscillator across suspend/resume sequence: enabled by default, it should be kept enabled on resume. - if codec is in active state: set the active bit at resume time. Signed-off-by: Nicolas Ferre <redacted> Signed-off-by: Uwe Kleine-K?nig <redacted> --- sound/soc/codecs/wm8731.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 2dc964b..e65af3d 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c@@ -481,7 +481,8 @@ static int wm8731_set_bias_level(struct snd_soc_codec *codec, break; case SND_SOC_BIAS_OFF: snd_soc_write(codec, WM8731_ACTIVE, 0x0); - snd_soc_write(codec, WM8731_PWR, 0xffff); + /* standby: keep crystal oscillator enabled */ + snd_soc_write(codec, WM8731_PWR, 0x00df); regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); break;
@@ -533,6 +534,8 @@ static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state) static int wm8731_resume(struct snd_soc_codec *codec) { wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY); + if (codec->active) + snd_soc_write(codec, WM8731_ACTIVE, 0x0001); return 0; }
--
1.7.3