[alsa-devel] [PATCH 17/19] ASoC: mrst_machine: make MIC2 pseudo-differential

[Lu Guanqun]

The Moorestown uses MIC2 pseudo-differential configuration.

Signed-off-by: Lu Guanqun <guanqun.lu at intel.com>
---
 sound/soc/mid-x86/mrst_machine.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/sound/soc/mid-x86/mrst_machine.c b/sound/soc/mid-x86/mrst_machine.c
index 5f19df5..7ea5bc5 100644
--- a/sound/soc/mid-x86/mrst_machine.c
+++ b/sound/soc/mid-x86/mrst_machine.c
@@ -163,6 +163,9 @@ static int mrst_audio_init(struct snd_soc_pcm_runtime *runtime)
 	/* DMIC configuration: mono output to PCM2 */
 	snd_soc_update_bits(codec, UPD9976_MICCTRL, BIT(1)|BIT(0), 0x1);
 
+	/* Set MIC2 to pseudo-differential */
+	snd_soc_update_bits(codec, UPD9976_MICSELVOL, BIT(4), BIT(4));
+
 	ret = snd_soc_dapm_new_controls(dapm,
 					mrst_audio_widgets,
 					ARRAY_SIZE(mrst_audio_widgets));