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. [1] http://www.ti.com/lit/an/slaa408a/slaa408a.pdf 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)) { ndelay(10); gpio_set_value(aic32x4->rstn_gpio, 1); + mdelay(1); } snd_soc_component_write(component, AIC32X4_RESET, 0x01); -- 2.45.2