Re: [PATCH v2 12/13] iio: imu: inv_mpu6050: use runtime pm with autosuspend

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Thanks for catching this up.
JB





From: Jonathan Cameron <jic23@xxxxxxxxxx>

Sent: Friday, February 21, 2020 12:54

To: Jean-Baptiste Maneyrol <JManeyrol@xxxxxxxxxxxxxx>

Cc: linux-iio@xxxxxxxxxxxxxxx <linux-iio@xxxxxxxxxxxxxxx>

Subject: Re: [PATCH v2 12/13] iio: imu: inv_mpu6050: use runtime pm with autosuspend

 


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On Wed, 19 Feb 2020 15:39:57 +0100

Jean-Baptiste Maneyrol <jmaneyrol@xxxxxxxxxxxxxx> wrote:



> Use runtime power management for handling chip power and

> sensor engines on/off. Simplifies things a lot since pm

> runtime already has reference counter.

> Usage of autosuspend reduces the number of power on/off. This

> makes polling interface now usable to get data at low

> frequency.

> 

> Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@xxxxxxxxxxxxxx>

Missing static marking after reducing scope of one function.

See inline. I've fixed that up and applied.



Thanks,





Jonathan



> ---

>  drivers/iio/imu/inv_mpu6050/inv_mpu_core.c    | 267 ++++++++++++------

>  drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h     |   5 +-

>  drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c |  33 ++-

>  3 files changed, 194 insertions(+), 111 deletions(-)

> 

> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

> index 9076b6bb099c..750fbc2614f0 100644

> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

> @@ -16,6 +16,8 @@

>  #include <linux/acpi.h>

>  #include <linux/platform_device.h>

>  #include <linux/regulator/consumer.h>

> +#include <linux/pm.h>

> +#include <linux/pm_runtime.h>

>  #include "inv_mpu_iio.h"

>  #include "inv_mpu_magn.h"

>  

> @@ -400,26 +402,13 @@ int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on)

>  {

>        int result;

>  

> -     if (power_on) {

> -             if (!st->powerup_count) {

> -                     result = inv_mpu6050_pwr_mgmt_1_write(st, false, -1, -1);

> -                     if (result)

> -                             return result;

> -                     usleep_range(INV_MPU6050_REG_UP_TIME_MIN,

> -                                  INV_MPU6050_REG_UP_TIME_MAX);

> -             }

> -             st->powerup_count++;

> -     } else {

> -             if (st->powerup_count == 1) {

> -                     result = inv_mpu6050_pwr_mgmt_1_write(st, true, -1, -1);

> -                     if (result)

> -                             return result;

> -             }

> -             st->powerup_count--;

> -     }

> +     result = inv_mpu6050_pwr_mgmt_1_write(st, !power_on, -1, -1);

> +     if (result)

> +             return result;

>  

> -     dev_dbg(regmap_get_device(st->map), "set power %d, count=%u\n",

> -             power_on, st->powerup_count);

> +     if (power_on)

> +             usleep_range(INV_MPU6050_REG_UP_TIME_MIN,

> +                          INV_MPU6050_REG_UP_TIME_MAX);

>  

>        return 0;

>  }

> @@ -563,6 +552,7 @@ static int inv_mpu6050_read_channel_data(struct iio_dev *indio_dev,

>                                         int *val)

>  {

>        struct inv_mpu6050_state *st = iio_priv(indio_dev);

> +     struct device *pdev = regmap_get_device(st->map);

>        unsigned int freq_hz, period_us, min_sleep_us, max_sleep_us;

>        int result;

>        int ret;

> @@ -571,92 +561,85 @@ static int inv_mpu6050_read_channel_data(struct iio_dev *indio_dev,

>        freq_hz = INV_MPU6050_DIVIDER_TO_FIFO_RATE(st->chip_config.divider);

>        period_us = 1000000 / freq_hz;

>  

> -     result = inv_mpu6050_set_power_itg(st, true);

> -     if (result)

> +     result = pm_runtime_get_sync(pdev);

> +     if (result < 0) {

> +             pm_runtime_put_noidle(pdev);

>                return result;

> +     }

>  

>        switch (chan->type) {

>        case IIO_ANGL_VEL:

> -             result = inv_mpu6050_switch_engine(st, true,

> -                             INV_MPU6050_SENSOR_GYRO);

> -             if (result)

> -                     goto error_power_off;

> -             /* need to wait 2 periods to have first valid sample */

> -             min_sleep_us = 2 * period_us;

> -             max_sleep_us = 2 * (period_us + period_us / 2);

> -             usleep_range(min_sleep_us, max_sleep_us);

> +             if (!st->chip_config.gyro_en) {

> +                     result = inv_mpu6050_switch_engine(st, true,

> +                                     INV_MPU6050_SENSOR_GYRO);

> +                     if (result)

> +                             goto error_power_off;

> +                     /* need to wait 2 periods to have first valid sample */

> +                     min_sleep_us = 2 * period_us;

> +                     max_sleep_us = 2 * (period_us + period_us / 2);

> +                     usleep_range(min_sleep_us, max_sleep_us);

> +             }

>                ret = inv_mpu6050_sensor_show(st, st->reg->raw_gyro,

>                                              chan->channel2, val);

> -             result = inv_mpu6050_switch_engine(st, false,

> -                             INV_MPU6050_SENSOR_GYRO);

> -             if (result)

> -                     goto error_power_off;

>                break;

>        case IIO_ACCEL:

> -             result = inv_mpu6050_switch_engine(st, true,

> -                             INV_MPU6050_SENSOR_ACCL);

> -             if (result)

> -                     goto error_power_off;

> -             /* wait 1 period for first sample availability */

> -             min_sleep_us = period_us;

> -             max_sleep_us = period_us + period_us / 2;

> -             usleep_range(min_sleep_us, max_sleep_us);

> +             if (!st->chip_config.accl_en) {

> +                     result = inv_mpu6050_switch_engine(st, true,

> +                                     INV_MPU6050_SENSOR_ACCL);

> +                     if (result)

> +                             goto error_power_off;

> +                     /* wait 1 period for first sample availability */

> +                     min_sleep_us = period_us;

> +                     max_sleep_us = period_us + period_us / 2;

> +                     usleep_range(min_sleep_us, max_sleep_us);

> +             }

>                ret = inv_mpu6050_sensor_show(st, st->reg->raw_accl,

>                                              chan->channel2, val);

> -             result = inv_mpu6050_switch_engine(st, false,

> -                             INV_MPU6050_SENSOR_ACCL);

> -             if (result)

> -                     goto error_power_off;

>                break;

>        case IIO_TEMP:

> -             result = inv_mpu6050_switch_engine(st, true,

> -                             INV_MPU6050_SENSOR_TEMP);

> -             if (result)

> -                     goto error_power_off;

> -             /* wait 1 period for first sample availability */

> -             min_sleep_us = period_us;

> -             max_sleep_us = period_us + period_us / 2;

> -             usleep_range(min_sleep_us, max_sleep_us);

> +             if (!st->chip_config.temp_en) {

> +                     result = inv_mpu6050_switch_engine(st, true,

> +                                     INV_MPU6050_SENSOR_TEMP);

> +                     if (result)

> +                             goto error_power_off;

> +                     /* wait 1 period for first sample availability */

> +                     min_sleep_us = period_us;

> +                     max_sleep_us = period_us + period_us / 2;

> +                     usleep_range(min_sleep_us, max_sleep_us);

> +             }

>                ret = inv_mpu6050_sensor_show(st, st->reg->temperature,

>                                              IIO_MOD_X, val);

> -             result = inv_mpu6050_switch_engine(st, false,

> -                             INV_MPU6050_SENSOR_TEMP);

> -             if (result)

> -                     goto error_power_off;

>                break;

>        case IIO_MAGN:

> -             result = inv_mpu6050_switch_engine(st, true,

> -                             INV_MPU6050_SENSOR_MAGN);

> -             if (result)

> -                     goto error_power_off;

> -             /* frequency is limited for magnetometer */

> -             if (freq_hz > INV_MPU_MAGN_FREQ_HZ_MAX) {

> -                     freq_hz = INV_MPU_MAGN_FREQ_HZ_MAX;

> -                     period_us = 1000000 / freq_hz;

> +             if (!st->chip_config.magn_en) {

> +                     result = inv_mpu6050_switch_engine(st, true,

> +                                     INV_MPU6050_SENSOR_MAGN);

> +                     if (result)

> +                             goto error_power_off;

> +                     /* frequency is limited for magnetometer */

> +                     if (freq_hz > INV_MPU_MAGN_FREQ_HZ_MAX) {

> +                             freq_hz = INV_MPU_MAGN_FREQ_HZ_MAX;

> +                             period_us = 1000000 / freq_hz;

> +                     }

> +                     /* need to wait 2 periods to have first valid sample */

> +                     min_sleep_us = 2 * period_us;

> +                     max_sleep_us = 2 * (period_us + period_us / 2);

> +                     usleep_range(min_sleep_us, max_sleep_us);

>                }

> -             /* need to wait 2 periods to have first valid sample */

> -             min_sleep_us = 2 * period_us;

> -             max_sleep_us = 2 * (period_us + period_us / 2);

> -             usleep_range(min_sleep_us, max_sleep_us);

>                ret = inv_mpu_magn_read(st, chan->channel2, val);

> -             result = inv_mpu6050_switch_engine(st, false,

> -                             INV_MPU6050_SENSOR_MAGN);

> -             if (result)

> -                     goto error_power_off;

>                break;

>        default:

>                ret = -EINVAL;

>                break;

>        }

>  

> -     result = inv_mpu6050_set_power_itg(st, false);

> -     if (result)

> -             goto error_power_off;

> +     pm_runtime_mark_last_busy(pdev);

> +     pm_runtime_put_autosuspend(pdev);

>  

>        return ret;

>  

>  error_power_off:

> -     inv_mpu6050_set_power_itg(st, false);

> +     pm_runtime_put_autosuspend(pdev);

>        return result;

>  }

>  

> @@ -795,6 +778,7 @@ static int inv_mpu6050_write_raw(struct iio_dev *indio_dev,

>                                 int val, int val2, long mask)

>  {

>        struct inv_mpu6050_state  *st = iio_priv(indio_dev);

> +     struct device *pdev = regmap_get_device(st->map);

>        int result;

>  

>        /*

> @@ -806,9 +790,11 @@ static int inv_mpu6050_write_raw(struct iio_dev *indio_dev,

>                return result;

>  

>        mutex_lock(&st->lock);

> -     result = inv_mpu6050_set_power_itg(st, true);

> -     if (result)

> +     result = pm_runtime_get_sync(pdev);

> +     if (result < 0) {

> +             pm_runtime_put_noidle(pdev);

>                goto error_write_raw_unlock;

> +     }

>  

>        switch (mask) {

>        case IIO_CHAN_INFO_SCALE:

> @@ -846,7 +832,8 @@ static int inv_mpu6050_write_raw(struct iio_dev *indio_dev,

>                break;

>        }

>  

> -     result |= inv_mpu6050_set_power_itg(st, false);

> +     pm_runtime_mark_last_busy(pdev);

> +     pm_runtime_put_autosuspend(pdev);

>  error_write_raw_unlock:

>        mutex_unlock(&st->lock);

>        iio_device_release_direct_mode(indio_dev);

> @@ -903,6 +890,7 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr,

>        int result;

>        struct iio_dev *indio_dev = dev_to_iio_dev(dev);

>        struct inv_mpu6050_state *st = iio_priv(indio_dev);

> +     struct device *pdev = regmap_get_device(st->map);

>  

>        if (kstrtoint(buf, 10, &fifo_rate))

>                return -EINVAL;

> @@ -920,9 +908,11 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr,

>                result = 0;

>                goto fifo_rate_fail_unlock;

>        }

> -     result = inv_mpu6050_set_power_itg(st, true);

> -     if (result)

> +     result = pm_runtime_get_sync(pdev);

> +     if (result < 0) {

> +             pm_runtime_put_noidle(pdev);

>                goto fifo_rate_fail_unlock;

> +     }

>  

>        result = regmap_write(st->map, st->reg->sample_rate_div, d);

>        if (result)

> @@ -938,8 +928,9 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr,

>        if (result)

>                goto fifo_rate_fail_power_off;

>  

> +     pm_runtime_mark_last_busy(pdev);

>  fifo_rate_fail_power_off:

> -     result |= inv_mpu6050_set_power_itg(st, false);

> +     pm_runtime_put_autosuspend(pdev);

>  fifo_rate_fail_unlock:

>        mutex_unlock(&st->lock);

>        if (result)

> @@ -1385,6 +1376,14 @@ static void inv_mpu_core_disable_regulator_action(void *_data)

>        inv_mpu_core_disable_regulator_vddio(st);

>  }

>  

> +static void inv_mpu_pm_disable(void *data)

> +{

> +     struct device *dev = data;

> +

> +     pm_runtime_put_sync_suspend(dev);

> +     pm_runtime_disable(dev);

> +}

> +

>  int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

>                int (*inv_mpu_bus_setup)(struct iio_dev *), int chip_type)

>  {

> @@ -1409,7 +1408,6 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

>        st = iio_priv(indio_dev);

>        mutex_init(&st->lock);

>        st->chip_type = chip_type;

> -     st->powerup_count = 0;

>        st->irq = irq;

>        st->map = regmap;

>  

> @@ -1521,8 +1519,16 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

>                        goto error_power_off;

>        }

>  

> -     /* chip init is done, turning off */

> -     result = inv_mpu6050_set_power_itg(st, false);

> +     /* chip init is done, turning on runtime power management */

> +     result = pm_runtime_set_active(dev);

> +     if (result)

> +             goto error_power_off;

> +     pm_runtime_get_noresume(dev);

> +     pm_runtime_enable(dev);

> +     pm_runtime_set_autosuspend_delay(dev, INV_MPU6050_SUSPEND_DELAY_MS);

> +     pm_runtime_use_autosuspend(dev);

> +     pm_runtime_put(dev);

> +     result = devm_add_action_or_reset(dev, inv_mpu_pm_disable, dev);

>        if (result)

>                return result;

>  

> @@ -1590,11 +1596,10 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

>  }

>  EXPORT_SYMBOL_GPL(inv_mpu_core_probe);

>  

> -#ifdef CONFIG_PM_SLEEP

> -

> -static int inv_mpu_resume(struct device *dev)

> +static int __maybe_unused inv_mpu_resume(struct device *dev)

>  {

> -     struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));

> +     struct iio_dev *indio_dev = dev_get_drvdata(dev);

> +     struct inv_mpu6050_state *st = iio_priv(indio_dev);

>        int result;

>  

>        mutex_lock(&st->lock);

> @@ -1603,27 +1608,101 @@ static int inv_mpu_resume(struct device *dev)

>                goto out_unlock;

>  

>        result = inv_mpu6050_set_power_itg(st, true);

> +     if (result)

> +             goto out_unlock;

> +

> +     result = inv_mpu6050_switch_engine(st, true, st->suspended_sensors);

> +     if (result)

> +             goto out_unlock;

> +

> +     if (iio_buffer_enabled(indio_dev))

> +             result = inv_mpu6050_prepare_fifo(st, true);

> +

>  out_unlock:

>        mutex_unlock(&st->lock);

>  

>        return result;

>  }

>  

> -static int inv_mpu_suspend(struct device *dev)

> +static int __maybe_unused inv_mpu_suspend(struct device *dev)

>  {

> -     struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));

> +     struct iio_dev *indio_dev = dev_get_drvdata(dev);

> +     struct inv_mpu6050_state *st = iio_priv(indio_dev);

>        int result;

>  

>        mutex_lock(&st->lock);

> +

> +     if (iio_buffer_enabled(indio_dev)) {

> +             result = inv_mpu6050_prepare_fifo(st, false);

> +             if (result)

> +                     goto out_unlock;

> +     }

> +

> +     st->suspended_sensors = 0;

> +     if (st->chip_config.accl_en)

> +             st->suspended_sensors |= INV_MPU6050_SENSOR_ACCL;

> +     if (st->chip_config.gyro_en)

> +             st->suspended_sensors |= INV_MPU6050_SENSOR_GYRO;

> +     if (st->chip_config.temp_en)

> +             st->suspended_sensors |= INV_MPU6050_SENSOR_TEMP;

> +     if (st->chip_config.magn_en)

> +             st->suspended_sensors |= INV_MPU6050_SENSOR_MAGN;

> +     result = inv_mpu6050_switch_engine(st, false, st->suspended_sensors);

> +     if (result)

> +             goto out_unlock;

> +

>        result = inv_mpu6050_set_power_itg(st, false);

> +     if (result)

> +             goto out_unlock;

> +

>        inv_mpu_core_disable_regulator_vddio(st);

> +out_unlock:

>        mutex_unlock(&st->lock);

>  

>        return result;

>  }

> -#endif /* CONFIG_PM_SLEEP */

>  

> -SIMPLE_DEV_PM_OPS(inv_mpu_pmops, inv_mpu_suspend, inv_mpu_resume);

> +static int __maybe_unused inv_mpu_runtime_suspend(struct device *dev)

> +{

> +     struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));

> +     unsigned int sensors;

> +     int ret;

> +

> +     mutex_lock(&st->lock);

> +

> +     sensors = INV_MPU6050_SENSOR_ACCL | INV_MPU6050_SENSOR_GYRO |

> +                     INV_MPU6050_SENSOR_TEMP | INV_MPU6050_SENSOR_MAGN;

> +     ret = inv_mpu6050_switch_engine(st, false, sensors);

> +     if (ret)

> +             goto out_unlock;

> +

> +     ret = inv_mpu6050_set_power_itg(st, false);

> +     if (ret)

> +             goto out_unlock;

> +

> +     inv_mpu_core_disable_regulator_vddio(st);

> +

> +out_unlock:

> +     mutex_unlock(&st->lock);

> +     return ret;

> +}

> +

> +static int __maybe_unused inv_mpu_runtime_resume(struct device *dev)

> +{

> +     struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));

> +     int ret;

> +

> +     ret = inv_mpu_core_enable_regulator_vddio(st);

> +     if (ret)

> +             return ret;

> +

> +     return inv_mpu6050_set_power_itg(st, true);

> +}

> +

> +const struct dev_pm_ops inv_mpu_pmops = {

> +     SET_SYSTEM_SLEEP_PM_OPS(inv_mpu_suspend, inv_mpu_resume)

> +     SET_RUNTIME_PM_OPS(inv_mpu_runtime_suspend, inv_mpu_runtime_resume, NULL)

> +};

>  EXPORT_SYMBOL_GPL(inv_mpu_pmops);

>  

>  MODULE_AUTHOR("Invensense Corporation");

> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

> index e328c98e362c..cd38b3fccc7b 100644

> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

> @@ -164,6 +164,7 @@ struct inv_mpu6050_hw {

>   *  @magn_disabled:     magnetometer disabled for backward compatibility reason.

>   *  @magn_raw_to_gauss:      coefficient to convert mag raw value to Gauss.

>   *  @magn_orient:       magnetometer sensor chip orientation if available.

> + *  @suspended_sensors:      sensors mask of sensors turned off for suspend

>   */

>  struct inv_mpu6050_state {

>        struct mutex lock;

> @@ -174,7 +175,6 @@ struct inv_mpu6050_state {

>        enum   inv_devices chip_type;

>        struct i2c_mux_core *muxc;

>        struct i2c_client *mux_client;

> -     unsigned int powerup_count;

>        struct inv_mpu6050_platform_data plat_data;

>        struct iio_mount_matrix orientation;

>        struct regmap *map;

> @@ -189,6 +189,7 @@ struct inv_mpu6050_state {

>        bool magn_disabled;

>        s32 magn_raw_to_gauss[3];

>        struct iio_mount_matrix magn_orient;

> +     unsigned int suspended_sensors;

>  };

>  

>  /*register and associated bit definition*/

> @@ -312,6 +313,7 @@ struct inv_mpu6050_state {

>  #define INV_MPU6050_ACCEL_UP_TIME            20

>  #define INV_MPU6050_GYRO_UP_TIME             35

>  #define INV_MPU6050_GYRO_DOWN_TIME           150

> +#define INV_MPU6050_SUSPEND_DELAY_MS         2000

>  

>  /* delay time in microseconds */

>  #define INV_MPU6050_REG_UP_TIME_MIN          5000

> @@ -439,7 +441,6 @@ int inv_mpu6050_prepare_fifo(struct inv_mpu6050_state *st, bool enable);

>  int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en,

>                              unsigned int mask);

>  int inv_mpu6050_write_reg(struct inv_mpu6050_state *st, int reg, u8 val);

> -int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on);

Having done this, function should be marked static in _core.c



I've done so.



>  int inv_mpu_acpi_create_mux_client(struct i2c_client *client);

>  void inv_mpu_acpi_delete_mux_client(struct i2c_client *client);

>  int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c

> index f53f50d08b9e..f7b5a70be30f 100644

> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c

> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c

> @@ -3,6 +3,7 @@

>  * Copyright (C) 2012 Invensense, Inc.

>  */

>  

> +#include <linux/pm_runtime.h>

>  #include "inv_mpu_iio.h"

>  

>  static unsigned int inv_scan_query_mpu6050(struct iio_dev *indio_dev)

> @@ -156,41 +157,43 @@ int inv_mpu6050_prepare_fifo(struct inv_mpu6050_state *st, bool enable)

>  static int inv_mpu6050_set_enable(struct iio_dev *indio_dev, bool enable)

>  {

>        struct inv_mpu6050_state *st = iio_priv(indio_dev);

> +     struct device *pdev = regmap_get_device(st->map);

>        unsigned int scan;

>        int result;

>  

> -     scan = inv_scan_query(indio_dev);

> -

>        if (enable) {

> -             result = inv_mpu6050_set_power_itg(st, true);

> -             if (result)

> +             scan = inv_scan_query(indio_dev);

> +             result = pm_runtime_get_sync(pdev);

> +             if (result < 0) {

> +                     pm_runtime_put_noidle(pdev);

>                        return result;

> +             }

> +             /*

> +              * In case autosuspend didn't trigger, turn off first not

> +              * required sensors.

> +              */

> +             result = inv_mpu6050_switch_engine(st, false, ~scan);

> +             if (result)

> +                     goto error_power_off;

>                result = inv_mpu6050_switch_engine(st, true, scan);

>                if (result)

>                        goto error_power_off;

>                st->skip_samples = inv_compute_skip_samples(st);

>                result = inv_mpu6050_prepare_fifo(st, true);

>                if (result)

> -                     goto error_sensors_off;

> +                     goto error_power_off;

>        } else {

>                result = inv_mpu6050_prepare_fifo(st, false);

> -             if (result)

> -                     goto error_sensors_off;

> -             result = inv_mpu6050_switch_engine(st, false, scan);

> -             if (result)

> -                     goto error_power_off;

> -

> -             result = inv_mpu6050_set_power_itg(st, false);

>                if (result)

>                        goto error_power_off;

> +             pm_runtime_mark_last_busy(pdev);

> +             pm_runtime_put_autosuspend(pdev);

>        }

>  

>        return 0;

>  

> -error_sensors_off:

> -     inv_mpu6050_switch_engine(st, false, scan);

>  error_power_off:

> -     inv_mpu6050_set_power_itg(st, false);

> +     pm_runtime_put_autosuspend(pdev);

>        return result;

>  }

>  



poer





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