ASoC: sgtl5000: Fix maximum value for microphone gain

sgtl5000 microphone gain only has 2 bits of resolution, so maximum value is 3.

From Eric Nelson:
"We also found that for the microphones we have here (commodity PC boom mics) a
default value of 2 for the gain gives the best results."

So change the default microphone gain as well.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index cb1675c..92bbfec 100644 (file)
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -401,7 +401,7 @@ static const struct snd_kcontrol_new sgtl5000_snd_controls[] = {
                        5, 1, 0),
 
        SOC_SINGLE_TLV("Mic Volume", SGTL5000_CHIP_MIC_CTRL,
-                       0, 4, 0, mic_gain_tlv),
+                       0, 3, 0, mic_gain_tlv),
 };
 
 /* mute the codec used by alsa core */
@@ -1344,7 +1344,7 @@ static int sgtl5000_probe(struct snd_soc_codec *codec)
                        SGTL5000_HP_ZCD_EN |
                        SGTL5000_ADC_ZCD_EN);
 
-       snd_soc_write(codec, SGTL5000_CHIP_MIC_CTRL, 0);
+       snd_soc_write(codec, SGTL5000_CHIP_MIC_CTRL, 2);
 
        /*
         * disable DAP