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ASoC: tpa6130a2: Revisit power-up sequence

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There are no known problems with current power-up sequence which first sets
the /shutdown pin high and then enables the supply. However, swap the order
so that the device is kept in shutdown/reset mode during the supply voltage
transition since slowly rising voltages can usually cause problems if the
device is not kept in reset.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Cc: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-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:
Jarkko Nikula 2010-11-08 10:57:57 +02:00 committed by Liam Girdwood
parent 414c73abfd
commit 0656f6cf6c
1 changed files with 3 additions and 3 deletions
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6
sound/soc/codecs/tpa6130a2.c
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@ -126,9 +126,6 @@ static int tpa6130a2_power(int power)
mutex_lock(&data->mutex); mutex_lock(&data->mutex);
if (power) { if (power) {
/* Power on */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 1);
ret = regulator_enable(data->supply); ret = regulator_enable(data->supply);
if (ret != 0) { if (ret != 0) {
@ -136,6 +133,9 @@ static int tpa6130a2_power(int power)
"Failed to enable supply: %d\n", ret); "Failed to enable supply: %d\n", ret);
goto exit; goto exit;
} }
/* Power on */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 1);
data->power_state = 1; data->power_state = 1;
ret = tpa6130a2_initialize(); ret = tpa6130a2_initialize();