[alsa-devel] [PATCH 1/4] ASoC: Suppress noop SYSCLK updates in WM8915

[Mark Brown]

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm8915.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/sound/soc/codecs/wm8915.c b/sound/soc/codecs/wm8915.c
index 5a59ef7..c61bc32 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);
 	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;
 }
 
-- 
1.7.5.3