ASoC: Clean up WM8974 PLL configuration

Don't use a static for WM8974 PLL factors - we don't support more than
one device so it won't happen but no sense in leaving the race condition
hanging around.  Also, pre_div is a single bit and it's a bit simpler if
we move the handling of the factor of 4 in the output into the
coefficient setup.

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

1 files changed, 13 insertions, 10 deletions

diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
index 5104c8aa34f6..f30f86b3bda0 100644
--- a/sound/soc/codecs/wm8974.c
+++ b/sound/soc/codecs/wm8974.c
@@ -330,36 +330,38 @@ static int wm8974_add_widgets(struct snd_soc_codec *codec)
 }
 
 struct pll_ {
-        unsigned int pre_div:4; /* prescale - 1 */
+        unsigned int pre_div:1;
         unsigned int n:4;
         unsigned int k;
 };
 
-static struct pll_ pll_div;
-
 /* The size in bits of the pll divide multiplied by 10
  * to allow rounding later */
 #define FIXED_PLL_SIZE ((1 << 24) * 10)
 
-static void pll_factors(unsigned int target, unsigned int source)
+static void pll_factors(struct pll_ *pll_div,
+                        unsigned int target, unsigned int source)
 {
         unsigned long long Kpart;
         unsigned int K, Ndiv, Nmod;
 
+        /* There is a fixed divide by 4 in the output path */
+        target *= 4;
+
         Ndiv = target / source;
         if (Ndiv < 6) {
-                source >>= 1;
-                pll_div.pre_div = 1;
+                source /= 2;
+                pll_div->pre_div = 1;
                 Ndiv = target / source;
         } else
-                pll_div.pre_div = 0;
+                pll_div->pre_div = 0;
 
         if ((Ndiv < 6) || (Ndiv > 12))
                 printk(KERN_WARNING
                         "WM8974 N value %u outwith recommended range!\n",
                         Ndiv);
 
-        pll_div.n = Ndiv;
+        pll_div->n = Ndiv;
         Nmod = target % source;
         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
 
@@ -374,13 +376,14 @@ static void pll_factors(unsigned int target, unsigned int source)
         /* Move down to proper range now rounding is done */
         K /= 10;
 
-        pll_div.k = K;
+        pll_div->k = K;
 }
 
 static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai,
                 int pll_id, unsigned int freq_in, unsigned int freq_out)
 {
         struct snd_soc_codec *codec = codec_dai->codec;
+        struct pll_ pll_div;
         u16 reg;
 
         if (freq_in == 0 || freq_out == 0) {
@@ -394,7 +397,7 @@ static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai,
                 return 0;
         }
 
-        pll_factors(freq_out*4, freq_in);
+        pll_factors(&pll_div, freq_out, freq_in);
 
         wm8974_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
         wm8974_write(codec, WM8974_PLLK1, pll_div.k >> 18);