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

From	"Fu, Zhonghui" <zhonghui.fu@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] hid: enable hid device to suspend/resume asynchronously
Date	2015-11-23 07:10 +0100
Message-ID	<qxSu6-6mp-3@gated-at.bofh.it> (permalink)
References	<qc7Tc-2Wj-5@gated-at.bofh.it> <qvtJv-wB-9@gated-at.bofh.it> <qvtTc-AH-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 11/16/2015 11:26 PM, Jiri Kosina wrote:
> On Mon, 16 Nov 2015, Fu, Zhonghui wrote:
>
>> 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
>

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Re: [PATCH v2] hid: enable hid device to suspend/resume asynchronously "Fu, Zhonghui" <zhonghui.fu@linux.intel.com> - 2015-11-16 16:20 +0100
  Re: [PATCH v2] hid: enable hid device to suspend/resume  asynchronously Jiri Kosina <jikos@kernel.org> - 2015-11-16 16:30 +0100
    Re: [PATCH v2] hid: enable hid device to suspend/resume asynchronously "Fu, Zhonghui" <zhonghui.fu@linux.intel.com> - 2015-11-23 07:10 +0100

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