hid: enable hid device to suspend/resume asynchronously

Now, PM core supports asynchronous suspend/resume mode for devices during system suspend/resume, and the power state transition of one device may be completed in separate kernel thread. PM core ensures all power state transition timing dependency between devices. This patch enables hid devices to suspend/resume asynchronously. This will take advantage of multicore and improve system suspend/resume speed.

Signed-off-by Zhonghui Fu <[email protected]>

---
Changes in v2:
- Amend commit message.

 drivers/hid/hid-core.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

drivers/hid/hid-core.c +1 -1

index 70a11ac..357f3a3 100644
@@ -2652,6 +2652,7 @@ struct hid_device *hid_allocate_device(void)
 	device_initialize(&hdev->dev);
 	hdev->dev.release = hid_device_release;
 	hdev->dev.bus = &hid_bus_type;
+	device_enable_async_suspend(&hdev->dev);
 
 	hid_close_report(hdev);
 
-- 1.7.1

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.

Quoted 10 lines · Zhonghui

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/[email protected]

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

Now, PM core supports asynchronous suspend/resume mode for devices during system suspend/resume, and the power state transition of one device may be completed in separate kernel thread. PM core ensures all power state transition timing dependency between devices. This patch enables hid devices to suspend/resume asynchronously. This will take advantage of multicore and improve system suspend/resume speed.

Signed-off-by Zhonghui Fu <[email protected]>

---
Changes in v2:
- Amend commit message.

 drivers/hid/hid-core.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

drivers/hid/hid-core.c +0 -0

index 70a11ac..357f3a3 100644