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ASoC: tpa6130a2: Defer SW enable from power enable 

Do not enable the amplifier right after the power has been
restored to the amplifier.
The DAPM_SUPPLY widget turns on the amp early in the DAPM
power walk, and the unmuting of channel happens quite late.
Keeping the amp in SW reset state ensures better muting.
In this way the pop noise coming from other components (codec)
can be filtered out.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Peter Ujfalusi 2010-11-30 16:00:01 +02:00 committed by Liam Girdwood
parent d5876ce124
commit d534bacd91
1 changed files with 1 additions and 5 deletions
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6
sound/soc/codecs/tpa6130a2.c
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@ -151,11 +151,6 @@ static int tpa6130a2_power(u8 power)
data->power_state = 0;
goto exit;
}
/* Clear SWS */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val &= ~TPA6130A2_SWS;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
} else {
/* set SWS */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
@ -301,6 +296,7 @@ static void tpa6130a2_channel_enable(u8 channel, int enable)
/* Enable amplifier */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val |= channel;
val &= ~TPA6130A2_SWS;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
/* Unmute channel */