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SubjectApplied "tlv320aic32x4: delay i2c access by 1 ms after hardware reset" to the asoc tree
The patch

tlv320aic32x4: delay i2c access by 1 ms after hardware reset

has been applied to the asoc tree at

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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From 674f9abd094552dc297a2afd0cb72d30aec539a3 Mon Sep 17 00:00:00 2001
From: Peter Seiderer <>
Date: Mon, 11 Feb 2019 22:06:30 +0100
Subject: [PATCH] tlv320aic32x4: delay i2c access by 1 ms after hardware reset

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.


Signed-off-by: Peter Seiderer <>
Signed-off-by: Mark Brown <>
sound/soc/codecs/tlv320aic32x4.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
index e1bfba62fc08..96f1526cb258 100644
--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -970,6 +970,7 @@ static int aic32x4_component_probe(struct snd_soc_component *component)
if (gpio_is_valid(aic32x4->rstn_gpio)) {
gpio_set_value(aic32x4->rstn_gpio, 1);
+ mdelay(1);

snd_soc_component_write(component, AIC32X4_RESET, 0x01);
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