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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-06-29 02:53:48 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-02 01:50:39 +0200
commitfe7450b05fddebd5a76a5ad280a5ae9a82ce336f (patch)
treed1d83e4a6b7553725e7440ba685b8c2d058f6420 /drivers/base
parent71723f95463d284004bd0afe1825e6790a0c90d0 (diff)
downloadlinux-fe7450b05fddebd5a76a5ad280a5ae9a82ce336f.tar.bz2
PM / runtime: Asynchronous "idle" in pm_runtime_allow()
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> Acked-by: Alan Stern <stern@rowland.harvard.edu> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index e7ee8293055b..aa3ea5e25377 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1260,7 +1260,7 @@ void pm_runtime_allow(struct device *dev)
dev->power.runtime_auto = true;
if (atomic_dec_and_test(&dev->power.usage_count))
- rpm_idle(dev, RPM_AUTO);
+ rpm_idle(dev, RPM_AUTO | RPM_ASYNC);
out:
spin_unlock_irq(&dev->power.lock);