iio: imu: st_lsm6dsx: do not apply ODR configuration in write_raw handler

This patch allows to avoid a transitory that occurs when a given sensor
has been already enabled (e.g. gyroscope) and the user is configuring
the sample frequency of the other one (e.g. accelerometer).
The transitory lasts until the accelerometer is enabled.
During that time slice the gyroscope ODR is incorrectly modified as well.
At the end of the transitory both sensors work at the right frequency.
Fix it introducing st_lsm6dsx_check_odr() routine to check ODR consistency
in write_raw handler in order to apply frequency configuration just
in st_lsm6dsx_set_odr()

Fixes: 290a6ce1 (iio: imu: add support to lsm6dsx driver)
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c

@@ -308,32 +308,40 @@ static int st_lsm6dsx_set_full_scale(struct st_lsm6dsx_sensor *sensor,
 	return 0;
 }
 
-static int st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u16 odr)
+static int st_lsm6dsx_check_odr(struct st_lsm6dsx_sensor *sensor, u16 odr,
+				u8 *val)
 {
-	enum st_lsm6dsx_sensor_id id = sensor->id;
-	int i, err;
-	u8 val;
+	int i;
 
 	for (i = 0; i < ST_LSM6DSX_ODR_LIST_SIZE; i++)
-		if (st_lsm6dsx_odr_table[id].odr_avl[i].hz == odr)
+		if (st_lsm6dsx_odr_table[sensor->id].odr_avl[i].hz == odr)
 			break;
 
 	if (i == ST_LSM6DSX_ODR_LIST_SIZE)
 		return -EINVAL;
 
-	val = st_lsm6dsx_odr_table[id].odr_avl[i].val;
-	err = st_lsm6dsx_write_with_mask(sensor->hw,
-					 st_lsm6dsx_odr_table[id].reg.addr,
-					 st_lsm6dsx_odr_table[id].reg.mask,
-					 val);
-	if (err < 0)
-		return err;
-
+	*val = st_lsm6dsx_odr_table[sensor->id].odr_avl[i].val;
 	sensor->odr = odr;
 
 	return 0;
 }
 
+static int st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u16 odr)
+{
+	enum st_lsm6dsx_sensor_id id = sensor->id;
+	int err;
+	u8 val;
+
+	err = st_lsm6dsx_check_odr(sensor, odr, &val);
+	if (err < 0)
+		return err;
+
+	return st_lsm6dsx_write_with_mask(sensor->hw,
+					  st_lsm6dsx_odr_table[id].reg.addr,
+					  st_lsm6dsx_odr_table[id].reg.mask,
+					  val);
+}
+
 int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor)
 {
 	int err;
@@ -436,9 +444,12 @@ static int st_lsm6dsx_write_raw(struct iio_dev *iio_dev,
 	case IIO_CHAN_INFO_SCALE:
 		err = st_lsm6dsx_set_full_scale(sensor, val2);
 		break;
-	case IIO_CHAN_INFO_SAMP_FREQ:
-		err = st_lsm6dsx_set_odr(sensor, val);
+	case IIO_CHAN_INFO_SAMP_FREQ: {
+		u8 data;
+
+		err = st_lsm6dsx_check_odr(sensor, val, &data);
 		break;
+	}
 	default:
 		err = -EINVAL;
 		break;