diff options
| author | Nicolin Chen <b42378@freescale.com> | 2013-12-04 17:22:16 +0800 |
|---|---|---|
| committer | Nicolin Chen <Guangyu.Chen@freescale.com> | 2014-01-16 19:27:47 +0800 |
| commit | 6466ab17b105c8cff4f52cd5de2cea06ca58e0b4 (patch) | |
| tree | 1fa3ed4244a62b42483cdf160cde636b82657b54 /sound | |
| parent | 1a885fa5391e73fd49da1d343a8dd18fbd7d8591 (diff) | |
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)
(cherry picked from commit 46ff60a75d0db92848913435bc345def2a2ccc5e)
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/wm8962.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c index 6c06febb9b3a..af49ec3c3684 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; |