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Subject [PATCH] PM: Enable asynchronous noirq resume threads to save the resuming time
From Chuansheng Liu <>
Date Tue, 14 Jan 2014 15:18:08 +0800
Currently, the dpm_resume_noirq() is done synchronously, and for PCI devices
pci_pm_resume_noirq():
pci_pm_resume_noirq()
pci_pm_default_resume_early()
pci_power_up()
pci_raw_set_power_state()
Which set the device from D3hot to D0 mostly, for every device, there will
be one 10ms(pci_pm_d3_delay) to wait.
Hence normally dpm_resume_noirq() will cost > 100ms, which is bigger for mobile
platform.
Here implementing it with asynchronous way which will reduce much.
For example below, The 80% time is saved.
With synchronous way:
[ 1411.272218] PM: noirq resume of devices complete after 92.223 msecs
With asynchronous way:
[ 110.616735] PM: noirq resume of devices complete after 10.544 msecs
Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
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