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List:       linux-kernel
Subject:    Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow()
From:       Kevin Hilman <khilman () baylibre ! com>
Date:       2016-06-30 22:48:37
Message-ID: m2poqyqomy.fsf () baylibre ! com
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"Rafael J. Wysocki" <rjw@rjwysocki.net> writes:

> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> Arjan reports that it takes a relatively long time to enable runtime
> PM for multiple devices at system startup, because all writes to the
> "control" attribute in sysfs are handled synchronously and if the
> device is suspended as a result of the write, it will block until
> that operation is complete.
>
> That may be avoided by passing the RPM_ASYNC flag to rpm_idle()
> in pm_runtime_allow() which will make it execute the device's
> "idle" callback asynchronously, so writes to "control" changing
> it from "on" to "auto" will return without waiting.
>
> Reported-by: Arjan van de Ven <arjan@linux.intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
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