Re: [PATCH v2] hid: enable hid device to suspend/resume asynchronously

On 11/16/2015 11:26 PM, Jiri Kosina wrote:

On Mon, 16 Nov 2015, Fu, Zhonghui wrote:

quoted

Hi Jiri,

Any comments about this patch?

After enabling the HID devices suspend/resume asynchronously on ASUS 
T100TA(Baytrail-T platform), the system suspend-to-idle/resume time is 
reduced about 20ms. Although this improvement is not very significant. 
But, if the suspend/resume operation of HID devices is very 
time-consuming on some other platforms, this patch can improve 
significantly system suspend/resume speed on these platforms.

Hi,

I don't think the question I've raised at

	http://lkml.kernel.org/r/alpine.LNX.2.00.1509251404130.30132@pobox.suse.cz

has ever been answered or at least discussed ... ?

Sorry for missing this mail.

At present, the file(/sys/.../power/async) can be used to enable one device suspend/resume asynchronously.  My patch only changes the default value of this file from "disabled" to "enabled".
The sole difference of asynchronous suspend/resume mode is that the suspend/resume operation of one device is carried out in a separate kernel thread, and PM core ensures all related dependency. I have verified this patch on some platforms, such as ASUS T100TA. Actually, many other devices have used this feature for a long time.


Thanks,
Zhonghui