PM: Enable asynchronous noirq resume threads to save the resuming time

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>

0 files changed, 0 insertions, 0 deletions