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ASoC: wm8994: Lower AIFnCLK divisor when dropping to 32kHz

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When lowering SYSCLK to 50kHz for accessory detection also lower the
AIFnCLK divisor to normalise the clocking configuration within the
device. This will not disrupt audio as we cannot support active audio
with such a low SYSCLK.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-10-24 10:56:30 +01:00
parent 0ffecd7d86
commit 6730049a47
1 changed files with 12 additions and 0 deletions
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12
sound/soc/codecs/wm8994.c
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@ -2346,6 +2346,18 @@ static int wm8994_set_dai_sysclk(struct snd_soc_dai *dai,
configure_clock(codec);
/*
* If SYSCLK will be less than 50kHz adjust AIFnCLK dividers
* for detection.
*/
if (max(wm8994->aifclk[0], wm8994->aifclk[1]) < 50000) {
dev_dbg(codec->dev, "Configuring AIFs for 128fs\n");
snd_soc_update_bits(codec, WM8994_AIF1_RATE,
WM8994_AIF1CLK_RATE_MASK, 0x1);
snd_soc_update_bits(codec, WM8994_AIF2_RATE,
WM8994_AIF2CLK_RATE_MASK, 0x1);
}
return 0;
}