[alsa-devel] [PATCH] ASoC: wm8994: Actively discharge idle MICBIAS with jack detect

[Mark Brown]

This minimises the chance of any external capacitors that are fitted
being discharged into headphones as they insert.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm8994.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index ee102d6..c20f376 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3201,6 +3201,9 @@ static irqreturn_t wm1811_jackdet_irq(int irq, void *data)
 		snd_soc_jack_report(wm8994->micdet[0].jack,
 				    SND_JACK_MECHANICAL, SND_JACK_MECHANICAL);
 
+		snd_soc_update_bits(codec, WM8958_MICBIAS2,
+				    WM8958_MICB2_DISCH, 0);
+
 		/*
 		 * Start off measument of microphone impedence to find
 		 * out what's actually there.
@@ -3212,6 +3215,9 @@ static irqreturn_t wm1811_jackdet_irq(int irq, void *data)
 	} else {
 		dev_dbg(codec->dev, "Jack not detected\n");
 
+		snd_soc_update_bits(codec, WM8958_MICBIAS2,
+				    WM8958_MICB2_DISCH, WM8958_MICB2_DISCH);
+
 		snd_soc_jack_report(wm8994->micdet[0].jack, 0,
 				    SND_JACK_MECHANICAL | SND_JACK_HEADSET |
 				    wm8994->btn_mask);
@@ -3297,6 +3303,9 @@ int wm8958_mic_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack,
 		 * otherwise jump straight to microphone detection.
 		 */
 		if (wm8994->jackdet) {
+			snd_soc_update_bits(codec, WM8958_MICBIAS2,
+					    WM8958_MICB2_DISCH,
+					    WM8958_MICB2_DISCH);
 			snd_soc_update_bits(codec, WM8994_LDO_1,
 					    WM8994_LDO1_DISCH, 0);
 			wm1811_jackdet_set_mode(codec,
-- 
1.7.9.1