ASoC: pandora: switch clock back to internal on stop

For some reason, OMAP doesn't enter lower power states with functional
clock (CLKS) source set to external, so switch it back to internal when
done playing.

diff --git a/sound/soc/omap/omap3pandora.c b/sound/soc/omap/omap3pandora.c
index 7605c37..891f530 100644 (file)
--- a/sound/soc/omap/omap3pandora.c
+++ b/sound/soc/omap/omap3pandora.c
@@ -77,6 +77,23 @@ static int omap3pandora_hw_params(struct snd_pcm_substream *substream,
        return 0;
 }
 
+static int omap3pandora_hw_free(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+       int ret;
+
+       /* Set McBSP clock back to internal for power saving to work */
+       ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_FCLK,
+                                    0, SND_SOC_CLOCK_IN);
+       if (ret < 0) {
+               pr_err(PREFIX "can't set cpu system clock\n");
+               return ret;
+       }
+
+       return 0;
+}
+
 static int omap3pandora_dac_event(struct snd_soc_dapm_widget *w,
        struct snd_kcontrol *k, int event)
 {
@@ -201,6 +218,7 @@ static int omap3pandora_in_init(struct snd_soc_pcm_runtime *rtd)
 
 static struct snd_soc_ops omap3pandora_ops = {
        .hw_params = omap3pandora_hw_params,
+       .hw_free = omap3pandora_hw_free,
 };
 
 /* Digital audio interface glue - connects codec <--> CPU */