[PATCH 2/5] iio: imu: mpu6050: fix INV_MPU6050_REG_UP_TIME delay

[Matt Ranostay <matt.ranostay@xxxxxxxxx>]

replace msleep(INV_MPU6050_REG_UP_TIME) with usleep_range calls
due to fact the wait time is under 20 milliseconds.

Signed-off-by: Matt Ranostay <matt.ranostay@xxxxxxxxx>
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 3 ++-
 drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c  | 3 ++-
 drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  | 7 ++++++-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 4324328fd304..6d4b19dd16f8 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -148,7 +148,8 @@ int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on)
 		return result;
 
 	if (power_on)
-		msleep(INV_MPU6050_REG_UP_TIME);
+		usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
+			     INV_MPU6050_REG_UP_TIME_MAX);
 
 	return 0;
 }
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
index af400dd892a9..37cc16d3fca3 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
@@ -68,7 +68,8 @@ static int inv_mpu6050_select_bypass(struct i2c_adapter *adap, void *mux_priv,
 		if (ret)
 			goto write_error;
 
-		msleep(INV_MPU6050_REG_UP_TIME);
+		usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
+			     INV_MPU6050_REG_UP_TIME_MAX);
 	}
 	if (!ret) {
 		st->powerup_count++;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
index fcc2f3dfdfa8..243324dd78de 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
@@ -172,10 +172,15 @@ struct inv_mpu6050_state {
 #define INV_MPU6050_BYTES_PER_3AXIS_SENSOR   6
 #define INV_MPU6050_FIFO_COUNT_BYTE          2
 #define INV_MPU6050_FIFO_THRESHOLD           500
+
+/* delay time in milliseconds */
 #define INV_MPU6050_POWER_UP_TIME            100
 #define INV_MPU6050_TEMP_UP_TIME             100
 #define INV_MPU6050_SENSOR_UP_TIME           30
-#define INV_MPU6050_REG_UP_TIME              5
+
+/* delay time in microseconds */
+#define INV_MPU6050_REG_UP_TIME_MIN          5000
+#define INV_MPU6050_REG_UP_TIME_MAX          10000
 
 #define INV_MPU6050_TEMP_OFFSET	             12421
 #define INV_MPU6050_TEMP_SCALE               2941
-- 
1.9.1

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