[PATCH] ASoC: rt9120: Make dev PM runtime bind AsoC component PM

[cy_huang]

From: ChiYuan Huang <cy_huang at richtek.com>

RT9120 uses PM runtime autosuspend to decrease the frequently on/off
spent time. This exists one case, when pcm is closed and dev PM is
waiting for autosuspend time expired to enter runtime suspend state.
At the mean time, system is going to enter suspend, dev PM runtime
suspend won't be called. It makes the rt9120 suspend consumption
current not as expected.

This patch can fix the rt9120 dev PM issue during runtime autosuspend
and system suspend by binding dev PM runtime and ASoC component PM.

Fixes: 80b949f332e3 ("ASoC: rt9120: Use pm_runtime and regcache to optimize 'pwdnn' logic")
Signed-off-by: ChiYuan Huang <cy_huang at richtek.com>
---
 sound/soc/codecs/rt9120.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/codecs/rt9120.c b/sound/soc/codecs/rt9120.c
index 644300e..fcf4fba 100644
--- a/sound/soc/codecs/rt9120.c
+++ b/sound/soc/codecs/rt9120.c
@@ -177,8 +177,20 @@ static int rt9120_codec_probe(struct snd_soc_component *comp)
 	return 0;
 }
 
+static int rt9120_codec_suspend(struct snd_soc_component *comp)
+{
+	return pm_runtime_force_suspend(comp->dev);
+}
+
+static int rt9120_codec_resume(struct snd_soc_component *comp)
+{
+	return pm_runtime_force_resume(comp->dev);
+}
+
 static const struct snd_soc_component_driver rt9120_component_driver = {
 	.probe = rt9120_codec_probe,
+	.suspend = rt9120_codec_suspend,
+	.resume = rt9120_codec_resume,
 	.controls = rt9120_snd_controls,
 	.num_controls = ARRAY_SIZE(rt9120_snd_controls),
 	.dapm_widgets = rt9120_dapm_widgets,
-- 
2.7.4