1 files changed, 29 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index c749ef339665..377ae646e20c 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -2299,6 +2299,33 @@ static int wm8994_aif3_hw_params(struct snd_pcm_substream *substream,
         return snd_soc_update_bits(codec, aif1_reg, WM8994_AIF1_WL_MASK, aif1);
 }
 
+static void wm8994_aif_shutdown(struct snd_pcm_substream *substream,
+                                struct snd_soc_dai *dai)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        int rate_reg = 0;
+
+        switch (dai->id) {
+        case 1:
+                rate_reg = WM8994_AIF1_RATE;
+                break;
+        case 2:
+                rate_reg = WM8994_AIF1_RATE;
+                break;
+        default:
+                break;
+        }
+
+        /* If the DAI is idle then configure the divider tree for the
+         * lowest output rate to save a little power if the clock is
+         * still active (eg, because it is system clock).
+         */
+        if (rate_reg && !dai->playback_active && !dai->capture_active)
+                snd_soc_update_bits(codec, rate_reg,
+                                    WM8994_AIF1_SR_MASK |
+                                    WM8994_AIF1CLK_RATE_MASK, 0x9);
+}
+
 static int wm8994_aif_mute(struct snd_soc_dai *codec_dai, int mute)
 {
         struct snd_soc_codec *codec = codec_dai->codec;
@@ -2365,6 +2392,7 @@ static struct snd_soc_dai_ops wm8994_aif1_dai_ops = {
         .set_sysclk     = wm8994_set_dai_sysclk,
         .set_fmt        = wm8994_set_dai_fmt,
         .hw_params      = wm8994_hw_params,
+        .shutdown       = wm8994_aif_shutdown,
         .digital_mute   = wm8994_aif_mute,
         .set_pll        = wm8994_set_fll,
         .set_tristate   = wm8994_set_tristate,
@@ -2374,6 +2402,7 @@ static struct snd_soc_dai_ops wm8994_aif2_dai_ops = {
         .set_sysclk     = wm8994_set_dai_sysclk,
         .set_fmt        = wm8994_set_dai_fmt,
         .hw_params      = wm8994_hw_params,
+        .shutdown       = wm8994_aif_shutdown,
         .digital_mute   = wm8994_aif_mute,
         .set_pll        = wm8994_set_fll,
         .set_tristate   = wm8994_set_tristate,