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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>
This commit is contained in:
Nicolin Chen 2013-12-04 17:22:16 +08:00 committed by Mark Brown
parent 6ce4eac1f6
commit 75704ecfbb
1 changed files with 13 additions and 0 deletions
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13
sound/soc/codecs/wm8962.c
View File

@ -2439,7 +2439,20 @@ 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;