From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Fri, 3 Jun 2011 16:09:49 +0000 (+0100)
Subject: ASoC: Suppress noop SYSCLK updates in WM8915
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ea7b4378364093678ff1724fa91c43913f97774b;p=linux-beck.git

ASoC: Suppress noop SYSCLK updates in WM8915

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

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;
 }