ASoC: codec: wm9860: Refactor PLL out freq search

Add a separate function for deriving (sysclk, lrclk, bclk)
when the clock is auto or pll.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 64 insertions, 29 deletions

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index ce159f13e7a4..36c84549da23 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -672,10 +672,70 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk,
         return *bclk_idx;
 }
 
+/**
+ * wm8960_configure_pll - checks if there is a PLL out frequency available
+ *      The PLL out frequency must be chosen such that:
+ *              - sysclk      = lrclk * dac_divs
+ *              - freq_out    = sysclk * sysclk_divs
+ *              - 10 * sysclk = bclk * bclk_divs
+ *
+ * @codec: codec structure
+ * @freq_in: input frequency used to derive freq out via PLL
+ * @sysclk_idx: sysclk_divs index for found sysclk
+ * @dac_idx: dac_divs index for found lrclk
+ * @bclk_idx: bclk_divs index for found bclk
+ *
+ * Returns:
+ *  -1, in case no PLL frequency out available was found
+ * >=0, in case we could derive bclk, lrclk, sysclk from PLL out using
+ *      (@sysclk_idx, @dac_idx, @bclk_idx) dividers
+ */
+static
+int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
+                         int *sysclk_idx, int *dac_idx, int *bclk_idx)
+{
+        struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+        int sysclk, bclk, lrclk, freq_out;
+        int diff, best_freq_out;
+        int i, j, k;
+
+        bclk = wm8960->bclk;
+        lrclk = wm8960->lrclk;
+
+        *bclk_idx = -1;
+
+        for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
+                if (sysclk_divs[i] == -1)
+                        continue;
+                for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
+                        sysclk = lrclk * dac_divs[j];
+                        freq_out = sysclk * sysclk_divs[i];
+
+                        for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) {
+                                if (!is_pll_freq_available(freq_in, freq_out))
+                                        continue;
+
+                                diff = sysclk - bclk * bclk_divs[k] / 10;
+                                if (diff == 0) {
+                                        *sysclk_idx = i;
+                                        *dac_idx = j;
+                                        *bclk_idx = k;
+                                        best_freq_out = freq_out;
+                                        break;
+                                }
+                        }
+                }
+        }
+
+        if (*bclk_idx != -1)
+                wm8960_set_pll(codec, freq_in, best_freq_out);
+
+        return *bclk_idx;
+}
 static int wm8960_configure_clocking(struct snd_soc_codec *codec)
 {
         struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
-        int sysclk, bclk, lrclk, freq_out, freq_in;
+        int freq_out, freq_in;
         u16 iface1 = snd_soc_read(codec, WM8960_IFACE1);
         int i, j, k;
         int ret;
@@ -692,8 +752,6 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec)
         }
 
         freq_in = wm8960->freq_in;
-        bclk = wm8960->bclk;
-        lrclk = wm8960->lrclk;
         /*
          * If it's sysclk auto mode, check if the MCLK can provide sysclk or
          * not. If MCLK can provide sysclk, using MCLK to provide sysclk
@@ -720,33 +778,10 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec)
                         return -EINVAL;
                 }
         }
-        /* get a available pll out frequency and set pll */
-        for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
-                if (sysclk_divs[i] == -1)
-                        continue;
-                for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
-                        sysclk = lrclk * dac_divs[j];
-                        freq_out = sysclk * sysclk_divs[i];
-
-                        for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) {
-                                if (sysclk == bclk * bclk_divs[k] / 10 &&
-                                    is_pll_freq_available(freq_in, freq_out)) {
-                                        wm8960_set_pll(codec,
-                                                       freq_in, freq_out);
-                                        break;
-                                } else {
-                                        continue;
-                                }
-                        }
-                        if (k != ARRAY_SIZE(bclk_divs))
-                                break;
-                }
-                if (j != ARRAY_SIZE(dac_divs))
-                        break;
-        }
 
-        if (i == ARRAY_SIZE(sysclk_divs)) {
-                dev_err(codec->dev, "failed to configure clock\n");
+        ret = wm8960_configure_pll(codec, freq_in, &i, &j, &k);
+        if (ret < 0) {
+                dev_err(codec->dev, "failed to configure clock via PLL\n");
                 return -EINVAL;
         }