Re: [RFC PATCH v2 9/9] iio: pressure: bmp280: test longer autosuspend (WIP)

[Jonathan Cameron <jic23@kernel.org>]

On Sun, 10 Aug 2025 20:58:46 +0200
Achim Gratz <Achim.Gratz@Stromeko.DE> wrote:

> Autosuspend delay should be configurable from sysfs via the power
> attributes, but that is apparently not working for me.  Since the
> standard value for autosuspend_delay is shorter than my typical
> measurement period and a suspend/resume incurs both additional latency
> and stronger tailing on the acquisition time, monkey-patch a 2s value
> in until I can figure out how to do this properly.
> 
> Signed-off-by: Achim Gratz <Achim.Gratz@Stromeko.DE>

Currently delay seems very short anyway, so I wouldn't mind increasing
it like you have here.

Jonathan

> ---
>  drivers/iio/pressure/bmp280-core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
> index 5c4126e4eccd..7d51ab0b92e9 100644
> --- a/drivers/iio/pressure/bmp280-core.c
> +++ b/drivers/iio/pressure/bmp280-core.c
> @@ -3500,6 +3500,8 @@ int bmp280_common_probe(struct device *dev,
>  	 * start-up time.
>  	 */
>  	pm_runtime_set_autosuspend_delay(dev, data->start_up_time_us / 10);
> +	/* test */
> +	pm_runtime_set_autosuspend_delay(dev, 2*MSEC_PER_SEC);
>  	pm_runtime_use_autosuspend(dev);
>  	pm_runtime_put(dev);
>