Re: [PATCH v3] PM / core: conditionally skip system pm in device/driver model

[Rafael J. Wysocki]

On Fri, Feb 23, 2024 at 3:38 PM Guan-Yu Lin <guanyulin@xxxxxxxxxx> wrote:
>
> In systems with a main processor and a co-processor, asynchronous
> controller management can lead to conflicts.  One example is the main
> processor attempting to suspend a device while the co-processor is
> actively using it. To address this, we introduce a new sysfs entry
> called "conditional_skip". This entry allows the system to selectively
> skip certain device power management state transitions. To use this
> feature, set the value in "conditional_skip" to indicate the type of
> state transition you want to avoid.  Please review /Documentation/ABI/
> testing/sysfs-devices-power for more detailed information.
>
> Signed-off-by: Guan-Yu Lin <guanyulin@xxxxxxxxxx>

Please explain how this is intended to work.  That is, what exactly
you expect to happen when the new attribute is set.