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| author | Jean-Baptiste Maneyrol | 2018-05-28 15:22:04 +0200 |
|---|---|---|
| committer | Jonathan Cameron | 2018-06-10 12:52:30 +0200 |
| commit | 4bcc19f1b218983be841a319a3a506f2e446c6b5 (patch) | |
| tree | cc6fac3c9fea51379e2286b3451beffb717dbcb3 /drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | |
| parent | iio: 104-quad-8: Provide defines for magic numbers (diff) | |
| download | kernel-qcow2-linux-4bcc19f1b218983be841a319a3a506f2e446c6b5.tar.gz kernel-qcow2-linux-4bcc19f1b218983be841a319a3a506f2e446c6b5.tar.xz kernel-qcow2-linux-4bcc19f1b218983be841a319a3a506f2e446c6b5.zip | |
iio: imu: inv_mpu6050: new timestamp mechanism
Check validity of interrupt timestamps by computing time between
2 interrupts. If it matches the chip frequency modulo 4%, it is
used as the data timestamp and also for estimating the chip
frequency measured from the system. Otherwise timestamp is
computed using the estimated chip frequency.
Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/imu/inv_mpu6050/inv_mpu_core.c')
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index f50477c360e2..de68e83fc52d 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -295,6 +295,13 @@ static int inv_mpu6050_init_config(struct iio_dev *indio_dev) memcpy(&st->chip_config, hw_info[st->chip_type].config, sizeof(struct inv_mpu6050_chip_config)); + /* + * Internal chip period is 1ms (1kHz). + * Let's use at the beginning the theorical value before measuring + * with interrupt timestamps. + */ + st->chip_period = NSEC_PER_MSEC; + return inv_mpu6050_set_power_itg(st, false); error_power_off: |