ASoC: sgtl5000: Enable VAG when DAC/ADC up
As manual described, VAG is an internal voltage reference of DAC/ADC, So enabled it before DAC/ADC up. One more thing should care about is VAG fully ramped down requires 400ms, wait it to avoid pop. Signed-off-by: NZeng Zhaoming <zengzm.kernel@gmail.com> Signed-off-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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