iio: imu: st_lsm6dsx: wait for settling time in st_lsm6dsx_read_oneshot

commit ea85bf906466191b58532bb19f4fbb4591f0a77e upstream.

We need to wait for sensor settling time (~ 3/ODR) before reading data
in st_lsm6dsx_read_oneshot routine in order to avoid corrupted samples.

Fixes: 290a6ce11d93 ("iio: imu: add support to lsm6dsx driver")
Reported-by: Mario Tesi <mario.tesi@st.com>
Tested-by: Mario Tesi <mario.tesi@st.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/b41ebda5535895298716c76d939f9f165fcd2d13.1644098120.git.lorenzo@kernel.org
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 8dbf744..a778ace 100644 (file)
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -1372,8 +1372,12 @@ static int st_lsm6dsx_read_oneshot(struct st_lsm6dsx_sensor *sensor,
        if (err < 0)
                return err;
 
+       /*
+        * we need to wait for sensor settling time before
+        * reading data in order to avoid corrupted samples
+        */
        delay = 1000000000 / sensor->odr;
-       usleep_range(delay, 2 * delay);
+       usleep_range(3 * delay, 4 * delay);
 
        err = st_lsm6dsx_read_locked(hw, addr, &data, sizeof(data));
        if (err < 0)