[alsa-devel] [PATCH] ASoC: sgtl5000: fix power on/off of MIC bias

[Shawn Guo]

From: Lionel Xu <Lionel.Xu at freescale.com>

There is no sound in the recorded wav, to enable recording, the VAG
should be powered up, and the mic bias resistor should be set up with
proper value.

Signed-off-by: Lionel Xu <lionel.xu at freescale.com>
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
Cc: Zeng Zhaoming <zengzm.kernel at gmail.com>
---
 sound/soc/codecs/sgtl5000.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index d192626..a24299c 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -132,11 +132,18 @@ static int mic_bias_event(struct snd_soc_dapm_widget *w,
 		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,
 				SGTL5000_BIAS_R_MASK,
 				SGTL5000_BIAS_R_4k << SGTL5000_BIAS_R_SHIFT);
+
+		snd_soc_update_bits(w->codec, SGTL5000_CHIP_ANA_POWER,
+				SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP);
 		break;
 
 	case SND_SOC_DAPM_PRE_PMD:
 		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,
-				SGTL5000_BIAS_R_MASK, 0);
+				SGTL5000_BIAS_R_MASK,
+				SGTL5000_BIAS_R_off << SGTL5000_BIAS_R_SHIFT);
+
+		snd_soc_update_bits(w->codec, SGTL5000_CHIP_ANA_POWER,
+				SGTL5000_VAG_POWERUP, 0);
 		break;
 	}
 	return 0;
@@ -197,7 +204,7 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = {
 	SND_SOC_DAPM_OUTPUT("HP_OUT"),
 	SND_SOC_DAPM_OUTPUT("LINE_OUT"),
 
-	SND_SOC_DAPM_MICBIAS_E("Mic Bias", SGTL5000_CHIP_MIC_CTRL, 8, 0,
+	SND_SOC_DAPM_MICBIAS_E("Mic Bias", SND_SOC_NOPM, 0, 0,
 				mic_bias_event,
 				SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 
@@ -229,7 +236,8 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = {
 /* routes for sgtl5000 */
 static const struct snd_soc_dapm_route sgtl5000_dapm_routes[] = {
 	{"Capture Mux", "LINE_IN", "LINE_IN"},	/* line_in --> adc_mux */
-	{"Capture Mux", "MIC_IN", "MIC_IN"},	/* mic_in --> adc_mux */
+	{"Mic Bias", NULL, "MIC_IN"},		/* mic_in --> mic bias */
+	{"Capture Mux", "MIC_IN", "Mic Bias"},	/* mic bias --> adc_mux */
 
 	{"ADC", NULL, "Capture Mux"},		/* adc_mux --> adc */
 	{"AIFOUT", NULL, "ADC"},		/* adc --> i2s_out */
-- 
1.7.4.1