1 files changed, 54 insertions, 24 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index d130602b3072..4ca5e56388a3 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -94,6 +94,30 @@ static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
         return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
 }
 
+/**
+ * snd_soc_dapm_set_bias_level - set the bias level for the system
+ * @socdev: audio device
+ * @level: level to configure
+ *
+ * Configure the bias (power) levels for the SoC audio device.
+ *
+ * Returns 0 for success else error.
+ */
+static int snd_soc_dapm_set_bias_level(struct snd_soc_device *socdev,
+                                       enum snd_soc_bias_level level)
+{
+        struct snd_soc_card *card = socdev->card;
+        struct snd_soc_codec *codec = socdev->card->codec;
+        int ret = 0;
+
+        if (card->set_bias_level)
+                ret = card->set_bias_level(card, level);
+        if (ret == 0 && codec->set_bias_level)
+                ret = codec->set_bias_level(codec, level);
+
+        return ret;
+}
+
 /* set up initial codec paths */
 static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
         struct snd_soc_dapm_path *p, int i)
@@ -707,9 +731,11 @@ static int dapm_power_widget(struct snd_soc_codec *codec, int event,
  */
 static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
 {
+        struct snd_soc_device *socdev = codec->socdev;
         struct snd_soc_dapm_widget *w;
         int ret = 0;
         int i, power;
+        int sys_power = 0;
 
         INIT_LIST_HEAD(&codec->up_list);
         INIT_LIST_HEAD(&codec->down_list);
@@ -731,6 +757,9 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
                                 continue;
 
                         power = w->power_check(w);
+                        if (power)
+                                sys_power = 1;
+
                         if (w->power == power)
                                 continue;
 
@@ -745,6 +774,15 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
                 }
         }
 
+        /* If we're changing to all on or all off then prepare */
+        if ((sys_power && codec->bias_level == SND_SOC_BIAS_STANDBY) ||
+            (!sys_power && codec->bias_level == SND_SOC_BIAS_ON)) {
+                ret = snd_soc_dapm_set_bias_level(socdev,
+                                                  SND_SOC_BIAS_PREPARE);
+                if (ret != 0)
+                        pr_err("Failed to prepare bias: %d\n", ret);
+        }
+
         /* Power down widgets first; try to avoid amplifying pops. */
         for (i = 0; i < ARRAY_SIZE(dapm_down_seq); i++) {
                 list_for_each_entry(w, &codec->down_list, power_list) {
@@ -773,6 +811,22 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
                 }
         }
 
+        /* If we just powered the last thing off drop to standby bias */
+        if (codec->bias_level == SND_SOC_BIAS_PREPARE && !sys_power) {
+                ret = snd_soc_dapm_set_bias_level(socdev,
+                                                  SND_SOC_BIAS_STANDBY);
+                if (ret != 0)
+                        pr_err("Failed to apply standby bias: %d\n", ret);
+        }
+
+        /* If we just powered up then move to active bias */
+        if (codec->bias_level == SND_SOC_BIAS_PREPARE && sys_power) {
+                ret = snd_soc_dapm_set_bias_level(socdev,
+                                                  SND_SOC_BIAS_ON);
+                if (ret != 0)
+                        pr_err("Failed to apply active bias: %d\n", ret);
+        }
+
         return 0;
 }
 
@@ -1721,30 +1775,6 @@ int snd_soc_dapm_stream_event(struct snd_soc_codec *codec,
 EXPORT_SYMBOL_GPL(snd_soc_dapm_stream_event);
 
 /**
- * snd_soc_dapm_set_bias_level - set the bias level for the system
- * @socdev: audio device
- * @level: level to configure
- *
- * Configure the bias (power) levels for the SoC audio device.
- *
- * Returns 0 for success else error.
- */
-int snd_soc_dapm_set_bias_level(struct snd_soc_device *socdev,
-                                enum snd_soc_bias_level level)
-{
-        struct snd_soc_card *card = socdev->card;
-        struct snd_soc_codec *codec = socdev->card->codec;
-        int ret = 0;
-
-        if (card->set_bias_level)
-                ret = card->set_bias_level(card, level);
-        if (ret == 0 && codec->set_bias_level)
-                ret = codec->set_bias_level(codec, level);
-
-        return ret;
-}
-
-/**
  * snd_soc_dapm_enable_pin - enable pin.
  * @codec: SoC codec
  * @pin: pin name