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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Stefan Popa <stefan.popa@analog.com>,
        Stable@vger.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH 5.3 061/112] iio: accel: adxl372: Perform a reset at start up
Date:   Wed, 16 Oct 2019 14:50:53 -0700
Message-Id: <20191016214900.706636626@linuxfoundation.org>
In-Reply-To: <20191016214844.038848564@linuxfoundation.org>
References: <20191016214844.038848564@linuxfoundation.org>
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From: Stefan Popa <stefan.popa@analog.com>

commit d9a997bd4d762d5bd8cc548d762902f58b5e0a74 upstream.

We need to perform a reset a start up to make sure that the chip is in a
consistent state. This reset also disables all the interrupts which
should only be enabled together with the iio buffer. Not doing this, was
sometimes causing unwanted interrupts to trigger.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Fixes: f4f55ce38e5f ("iio:adxl372: Add FIFO and interrupts support")
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/accel/adxl372.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/iio/accel/adxl372.c
+++ b/drivers/iio/accel/adxl372.c
@@ -575,6 +575,14 @@ static int adxl372_setup(struct adxl372_
 		return -ENODEV;
 	}
 
+	/*
+	 * Perform a software reset to make sure the device is in a consistent
+	 * state after start up.
+	 */
+	ret = regmap_write(st->regmap, ADXL372_RESET, ADXL372_RESET_CODE);
+	if (ret < 0)
+		return ret;
+
 	ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
 	if (ret < 0)
 		return ret;