ASoC: wm8962: Enable SYSCLK provisonally before fetching generated DSPCLK_DIV

DSPCLK_DIV can be only generated correctly after enabling SYSCLK. But if the
current bias_level hasn't reached SND_SOC_BIAS_ON, DAPM won't enable SYSCLK,
which would cause the calculation result from DSPCLK_DIV invalid since bit
DSPCLK_DIV will be finally turned to its true value after DAPM enables SYSCLK
while the driver won't calculate it again for the current instance. In this
circumstance, a playback which needs non-zero DSPCLK_DIV would be distorted
due to unexpected clock frequency resulted from an invalid DSPCLK_DIV value.

So this patch provisionally enables the SYSCLK to get a valid DSPCLK_DIV for
calculation and then disables it afterward.

Signed-off-by: Nicolin Chen <b42378@freescale.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit 75704ecfbb4124139b78b71dd603f05d61abe689)

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
index ffff0bed0cf3..138d3c9c52ff 100644
--- a/sound/soc/codecs/wm8962.c
+++ b/sound/soc/codecs/wm8962.c
@@ -2432,7 +2432,20 @@ static void wm8962_configure_bclk(struct snd_soc_codec *codec)
         snd_soc_update_bits(codec, WM8962_CLOCKING_4,
                             WM8962_SYSCLK_RATE_MASK, clocking4);
 
+        /* DSPCLK_DIV can be only generated correctly after enabling SYSCLK.
+         * So we here provisionally enable it and then disable it afterward
+         * if current bias_level hasn't reached SND_SOC_BIAS_ON.
+         */
+        if (codec->dapm.bias_level != SND_SOC_BIAS_ON)
+                snd_soc_update_bits(codec, WM8962_CLOCKING2,
+                                WM8962_SYSCLK_ENA_MASK, WM8962_SYSCLK_ENA);
+
         dspclk = snd_soc_read(codec, WM8962_CLOCKING1);
+
+        if (codec->dapm.bias_level != SND_SOC_BIAS_ON)
+                snd_soc_update_bits(codec, WM8962_CLOCKING2,
+                                WM8962_SYSCLK_ENA_MASK, 0);
+
         if (dspclk < 0) {
                 dev_err(codec->dev, "Failed to read DSPCLK: %d\n", dspclk);
                 return;