The patch
tlv320aic32x4: delay i2c access by 1 ms after hardware reset
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
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.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 674f9abd094552dc297a2afd0cb72d30aec539a3 Mon Sep 17 00:00:00 2001
From: Peter Seiderer ps.report@gmx.net 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 ps.report@gmx.net Signed-off-by: Mark Brown broonie@kernel.org --- 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);