ASoC: codec: wm8960: Relax bit clock computation when using PLL

Bitclk is derived from sysclk using bclk_divs.
Sysclk can be derived in two ways:
	(1) directly from MLCK
	(2) MCLK via PLL

Commit 3c01b9ee2ab9d0d ("ASoC: codec: wm8960: Relax bit clock
computation")
relaxed bitclk computation when sysclk is directly derived from MCLK.

Lets do the same thing when sysclk is derived via PLL.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 16 insertions, 2 deletions

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index d899623fb101..9ed455700954 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -679,6 +679,10 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk,
  *              - freq_out    = sysclk * sysclk_divs
  *              - 10 * sysclk = bclk * bclk_divs
  *
+ *      If we cannot find an exact match for (sysclk, lrclk, bclk)
+ *      triplet, we relax the bclk such that bclk is chosen as the
+ *      closest available frequency greater than expected bclk.
+ *
  * @codec: codec structure
  * @freq_in: input frequency used to derive freq out via PLL
  * @sysclk_idx: sysclk_divs index for found sysclk
@@ -696,12 +700,14 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
 {
         struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
         int sysclk, bclk, lrclk, freq_out;
-        int diff;
+        int diff, closest, best_freq_out;
         int i, j, k;
 
         bclk = wm8960->bclk;
         lrclk = wm8960->lrclk;
+        closest = freq_in;
 
+        best_freq_out = -EINVAL;
         *sysclk_idx = *dac_idx = *bclk_idx = -1;
 
         for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
@@ -722,10 +728,18 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
                                         *bclk_idx = k;
                                         return freq_out;
                                 }
+                                if (diff > 0 && closest > diff) {
+                                        *sysclk_idx = i;
+                                        *dac_idx = j;
+                                        *bclk_idx = k;
+                                        closest = diff;
+                                        best_freq_out = freq_out;
+                                }
                         }
                 }
         }
-        return -EINVAL;
+
+        return best_freq_out;
 }
 static int wm8960_configure_clocking(struct snd_soc_codec *codec)
 {