ASoC: Suppress noop SYSCLK updates in WM8915

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8915.c b/sound/soc/codecs/wm8915.c
index b654fcd14897..eecd2c116122 100644
--- a/sound/soc/codecs/wm8915.c
+++ b/sound/soc/codecs/wm8915.c
@@ -55,6 +55,7 @@ struct wm8915_priv {
         int ldo1ena;
 
         int sysclk;
+        int sysclk_src;
 
         int fll_src;
         int fll_fref;
@@ -1834,6 +1835,9 @@ static int wm8915_set_sysclk(struct snd_soc_dai *dai,
         int src;
         int old;
 
+        if (freq == wm8915->sysclk && clk_id == wm8915->sysclk_src)
+                return 0;
+
         /* Disable SYSCLK while we reconfigure */
         old = snd_soc_read(codec, WM8915_AIF_CLOCKING_1) & WM8915_SYSCLK_ENA;
         snd_soc_update_bits(codec, WM8915_AIF_CLOCKING_1,
@@ -1885,6 +1889,8 @@ static int wm8915_set_sysclk(struct snd_soc_dai *dai,
         snd_soc_update_bits(codec, WM8915_AIF_CLOCKING_1,
                             WM8915_SYSCLK_ENA, old);
 
+        wm8915->sysclk_src = clk_id;
+
         return 0;
 }