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tlv320aic32x4: delay i2c access by 1 ms after hardware reset

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As stated in 'TLV320AIC3254 Application Reference Guide' ([1]):

  3.2 Device Startup Lockout Times
    After the TLV320AIC3254 initializes through hardware reset at power-up
    or software reset, the internal registers initialize to default values.
    This initialization takes place within 1ms after pulling the RESET
    signal high. During this initialization phase, no register-read or
    register-write operation should be performed on ADC or DAC coefficient
    buffers. Also, no block within the codec should be powered up during
    the initialization phase.

[1] http://www.ti.com/lit/an/slaa408a/slaa408a.pdf

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Peter Seiderer 2019-02-11 22:06:30 +01:00 committed by Mark Brown
parent fc23af99e4
commit 674f9abd09
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sound/soc/codecs/tlv320aic32x4.c
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@ -970,6 +970,7 @@ static int aic32x4_component_probe(struct snd_soc_component *component)
if (gpio_is_valid(aic32x4->rstn_gpio)) {
ndelay(10);
gpio_set_value(aic32x4->rstn_gpio, 1);
mdelay(1);
}
snd_soc_component_write(component, AIC32X4_RESET, 0x01);