Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow()

From	Kevin Hilman <khilman@baylibre.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow()
Date	2016-07-01 00:50 +0200
Message-ID	<rPSWt-6SL-3@gated-at.bofh.it> (permalink)
References	<rPbRv-5D5-5@gated-at.bofh.it>
Organization	BayLibre

Show all headers | View raw

"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>

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-06-29 02:50 +0200
  Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() Alan Stern <stern@rowland.harvard.edu> - 2016-06-29 16:10 +0200
    Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() Lukas Wunner <lukas@wunner.de> - 2016-06-29 17:00 +0200
  Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() Ulf Hansson <ulf.hansson@linaro.org> - 2016-06-29 19:00 +0200
  Re: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() Kevin Hilman <khilman@baylibre.com> - 2016-07-01 00:50 +0200

csiph-web