ASoC: Put WM8958 and WM1811 MICBIAS into bypass mode when no audio

When we don't have any active audio we can put the microphone biases into
bypass mode to save power at the expense of performance.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 0a16de743dd8dff9c8e095f50936bbe165d48589..207bccd156f1a1cdda4e3a9f49a0b697cc13658f 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -2025,6 +2025,18 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                break;
 
        case SND_SOC_BIAS_PREPARE:
+               /* MICBIAS into regulating mode */
+               switch (control->type) {
+               case WM8958:
+               case WM1811:
+                       snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                           WM8958_MICB1_MODE, 0);
+                       snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                           WM8958_MICB2_MODE, 0);
+                       break;
+               default:
+                       break;
+               }
                break;
 
        case SND_SOC_BIAS_STANDBY:
@@ -2077,7 +2089,20 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                                            WM8994_LINEOUT2_DISCH);
                }
 
-
+               /* MICBIAS into bypass mode on newer devices */
+               switch (control->type) {
+               case WM8958:
+               case WM1811:
+                       snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                           WM8958_MICB1_MODE,
+                                           WM8958_MICB1_MODE);
+                       snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                           WM8958_MICB2_MODE,
+                                           WM8958_MICB2_MODE);
+                       break;
+               default:
+                       break;
+               }
                break;
 
        case SND_SOC_BIAS_OFF:
@@ -3371,6 +3396,19 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
                break;
        }
 
+       /* Put MICBIAS into bypass mode by default on newer devices */
+       switch (control->type) {
+       case WM8958:
+       case WM1811:
+               snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                   WM8958_MICB1_MODE, WM8958_MICB1_MODE);
+               snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                   WM8958_MICB2_MODE, WM8958_MICB2_MODE);
+               break;
+       default:
+               break;
+       }
+
        wm8994_update_class_w(codec);
 
        wm8994_handle_pdata(wm8994);