ALSA: hda - Tweak OLPC XO-1.5 microphone bias

Our contacts at Conexant suggested that we reduce the external
microphone bias to 50% in order to center the input signal with
the DC input range of the codec. This is because the microphone
port is DC coupled for potential use with sensors.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 3 deletions

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 6479e65858d3..905859d4f4df 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -110,6 +110,7 @@ struct conexant_spec {
 
         unsigned int dell_automute;
         unsigned int port_d_mode;
+        unsigned char ext_mic_bias;
 };
 
 static int conexant_playback_pcm_open(struct hda_pcm_stream *hinfo,
@@ -1927,6 +1928,11 @@ static hda_nid_t cxt5066_adc_nids[3] = { 0x14, 0x15, 0x16 };
 static hda_nid_t cxt5066_capsrc_nids[1] = { 0x17 };
 #define CXT5066_SPDIF_OUT       0x21
 
+/* OLPC's microphone port is DC coupled for use with external sensors,
+ * therefore we use a 50% mic bias in order to center the input signal with
+ * the DC input range of the codec. */
+#define CXT5066_OLPC_EXT_MIC_BIAS PIN_VREF50
+
 static struct hda_channel_mode cxt5066_modes[1] = {
         { 2, NULL },
 };
@@ -1980,9 +1986,10 @@ static int cxt5066_hp_master_sw_put(struct snd_kcontrol *kcontrol,
 /* toggle input of built-in and mic jack appropriately */
 static void cxt5066_automic(struct hda_codec *codec)
 {
-        static struct hda_verb ext_mic_present[] = {
+        struct conexant_spec *spec = codec->spec;
+        struct hda_verb ext_mic_present[] = {
                 /* enable external mic, port B */
-                {0x1a, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREF80},
+                {0x1a, AC_VERB_SET_PIN_WIDGET_CONTROL, spec->ext_mic_bias},
 
                 /* switch to external mic input */
                 {0x17, AC_VERB_SET_CONNECT_SEL, 0},
@@ -2235,7 +2242,7 @@ static struct hda_verb cxt5066_init_verbs_olpc[] = {
         {0x19, AC_VERB_SET_CONNECT_SEL, 0x00}, /* DAC1 */
 
         /* Port B: external microphone */
-        {0x1a, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREF80},
+        {0x1a, AC_VERB_SET_PIN_WIDGET_CONTROL, CXT5066_OLPC_EXT_MIC_BIAS},
 
         /* Port C: internal microphone */
         {0x1b, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREF80},
@@ -2353,6 +2360,7 @@ static int patch_cxt5066(struct hda_codec *codec)
         spec->input_mux = &cxt5066_capture_source;
 
         spec->port_d_mode = PIN_HP;
+        spec->ext_mic_bias = PIN_VREF80;
 
         spec->num_init_verbs = 1;
         spec->init_verbs[0] = cxt5066_init_verbs;
@@ -2384,6 +2392,7 @@ static int patch_cxt5066(struct hda_codec *codec)
                 spec->mixers[spec->num_mixers++] = cxt5066_mixer_master_olpc;
                 spec->mixers[spec->num_mixers++] = cxt5066_mixers;
                 spec->port_d_mode = 0;
+                spec->ext_mic_bias = CXT5066_OLPC_EXT_MIC_BIAS;
 
                 /* no S/PDIF out */
                 spec->multiout.dig_out_nid = 0;