Messages in this thread | | | From | Kevin Hilman <> | Subject | Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() | Date | Thu, 30 Jun 2016 15:48:37 -0700 |
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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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