Re: [PATCH 01/13] iio: imu: st_lsm6dsx: use st_lsm6dsx_read_locked in st_lsm6dsx_report_motion_event

[Sean Nyekjaer <sean@geanix.com>]

On 06/10/2019 15.21, Lorenzo Bianconi wrote:
> Rely on st_lsm6dsx_read_locked in st_lsm6dsx_report_motion_event since
> it can run concurrently with sensor hub configuration. Move event
> related code in st_lsm6dsx_report_motion_event
> 
> Fixes: 1aabad1fb5e9 ("iio: imu: st_lsm6dsx: add motion report function and call from interrupt")
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Tested-by: Sean Nyekjaer <sean@geanix.com>
> ---
>   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 34 ++++++++++++--------
>   1 file changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 8a813ddba19c..df270905f21d 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -1757,10 +1757,23 @@ static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,
>   	return iio_dev;
>   }
>   
> -static void st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw, int data)
> +static bool
> +st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>   {
> -	s64 timestamp = iio_get_time_ns(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
> +	const struct st_lsm6dsx_event_settings *event_settings;
> +	int err, data;
> +	s64 timestamp;
>   
> +	if (!hw->enable_event)
> +		return false;
> +
> +	event_settings = &hw->settings->event_settings;
> +	err = st_lsm6dsx_read_locked(hw, event_settings->wakeup_src_reg,
> +				     &data, sizeof(data));
> +	if (err < 0)
> +		return false;
> +
> +	timestamp = iio_get_time_ns(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
>   	if ((data & hw->settings->event_settings.wakeup_src_z_mask) &&
>   	    (hw->enable_event & BIT(IIO_MOD_Z)))
>   		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> @@ -1790,30 +1803,23 @@ static void st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw, int data)
>   						  IIO_EV_TYPE_THRESH,
>   						  IIO_EV_DIR_EITHER),
>   						  timestamp);
> +
> +	return data & event_settings->wakeup_src_status_mask;
>   }
>   
>   static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
>   {
>   	struct st_lsm6dsx_hw *hw = private;
> +	bool event;
>   	int count;
> -	int data, err;
> -
> -	if (hw->enable_event) {
> -		err = regmap_read(hw->regmap,
> -				  hw->settings->event_settings.wakeup_src_reg,
> -				  &data);
> -		if (err < 0)
> -			return IRQ_NONE;
>   
> -		if (data & hw->settings->event_settings.wakeup_src_status_mask)
> -			st_lsm6dsx_report_motion_event(hw, data);
> -	}
> +	event = st_lsm6dsx_report_motion_event(hw);
>   
>   	mutex_lock(&hw->fifo_lock);
>   	count = hw->settings->fifo_ops.read_fifo(hw);
>   	mutex_unlock(&hw->fifo_lock);
>   
> -	return count ? IRQ_HANDLED : IRQ_NONE;
> +	return count || event ? IRQ_HANDLED : IRQ_NONE;
>   }
>   
>   static int st_lsm6dsx_irq_setup(struct st_lsm6dsx_hw *hw)
>