The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ea85bf906466191b58532bb19f4fbb4591f0a77e Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi lorenzo@kernel.org Date: Sat, 5 Feb 2022 22:57:42 +0100 Subject: [PATCH] iio: imu: st_lsm6dsx: wait for settling time in st_lsm6dsx_read_oneshot
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/b41ebda5535895298716c76d939f9f165fcd2d13.164409812... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index 727b4b6ac696..93f0c6bce502 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -1374,8 +1374,12 @@ 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)