linux-kernel - [PATCH 4/4] iio: adc: ad7124: set initial ADC mode to idle

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Message-Id: <20240731-ad7124-fix-v1-4-46a76aa4b9be@analog.com>
Date: Wed, 31 Jul 2024 15:37:25 +0300
From: Dumitru Ceclan <mitrutzceclan@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 Stefan Popa <stefan.popa@...log.com>, 
 Alexandru Tachici <alexandru.tachici@...log.com>
Cc: Dumitru Ceclan <mitrutzceclan@...il.com>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-iio@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Dumitru Ceclan <dumitru.ceclan@...log.com>
Subject: [PATCH 4/4] iio: adc: ad7124: set initial ADC mode to idle

During setup the st->adc_control is 0, which corresponds to a continuous
conversion mode. The reset value for channel 1 is to enable it. The
combined effect of these two is that the ADC will start conversions for
channel 1 without them being read.
This is not neccessarily a problem, but it is an unexpected behavior.

Set the ADC state to idle during setup to avoid this.

Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
---
 drivers/iio/adc/ad7124.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 4d63cd5c9d04..47abefd0fe5f 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -899,6 +899,9 @@ static int ad7124_setup(struct ad7124_state *st)
 	st->adc_control &= ~AD7124_ADC_CTRL_PWR_MSK;
 	st->adc_control |= AD7124_ADC_CTRL_PWR(power_mode);
 
+	st->adc_control &= ~AD7124_ADC_CTRL_MODE_MSK;
+	st->adc_control |= AD7124_ADC_CTRL_MODE(AD_SD_MODE_IDLE);
+
 	mutex_init(&st->cfgs_lock);
 	INIT_KFIFO(st->live_cfgs_fifo);
 	for (i = 0; i < st->num_channels; i++) {

-- 
2.43.0