ASoC: wm8994: Actively discharge idle MICBIAS with jack detect
This minimises the chance of any external capacitors that are fitted
being discharged into headphones as they insert.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index e9a405a..77085c1 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3224,6 +3224,9 @@
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.
@@ -3235,6 +3238,9 @@
} 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);
@@ -3320,6 +3326,9 @@
* 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,