linux-kernel - [PATCH 1/5] ASoC: wm8731: rework power management

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Date:	Wed, 29 Jun 2011 20:00:15 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	alsa-devel@...a-project.org, broonie@...nsource.wolfsonmicro.com,
	lrg@...com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: [PATCH 1/5] ASoC: wm8731: rework power management

- 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 <nicolas.ferre@...el.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 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

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