ASoC: Don't reconfigure WM8350 FLL if not needed

If the requested FLL configuration is the one we're currently running
in it's at best pointless to reconfigure the FLL.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8350.c b/sound/soc/codecs/wm8350.c
index 4ded0e3a35e0..71c9c4bb2632 100644
--- a/sound/soc/codecs/wm8350.c
+++ b/sound/soc/codecs/wm8350.c
@@ -63,6 +63,8 @@ struct wm8350_data {
         struct wm8350_jack_data hpl;
         struct wm8350_jack_data hpr;
         struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
+        int fll_freq_out;
+        int fll_freq_in;
 };
 
 static unsigned int wm8350_codec_cache_read(struct snd_soc_codec *codec,
@@ -1104,10 +1106,14 @@ static int wm8350_set_fll(struct snd_soc_dai *codec_dai,
 {
         struct snd_soc_codec *codec = codec_dai->codec;
         struct wm8350 *wm8350 = codec->control_data;
+        struct wm8350_data *priv = codec->private_data;
         struct _fll_div fll_div;
         int ret = 0;
         u16 fll_1, fll_4;
 
+        if (freq_in == priv->fll_freq_in && freq_out == priv->fll_freq_out)
+                return 0;
+
         /* power down FLL - we need to do this for reconfiguration */
         wm8350_clear_bits(wm8350, WM8350_POWER_MGMT_4,
                           WM8350_FLL_ENA | WM8350_FLL_OSC_ENA);
@@ -1142,6 +1148,9 @@ static int wm8350_set_fll(struct snd_soc_dai *codec_dai,
         wm8350_set_bits(wm8350, WM8350_POWER_MGMT_4, WM8350_FLL_OSC_ENA);
         wm8350_set_bits(wm8350, WM8350_POWER_MGMT_4, WM8350_FLL_ENA);
 
+        priv->fll_freq_out = freq_out;
+        priv->fll_freq_in = freq_in;
+
         return 0;
 }