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SubjectRe: [PATCH] HID: usbhid: enable remote wakeup for mice
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Dear Greg,

On 2/22/2023 2:04 PM, Greg KH wrote:
> On Wed, Feb 22, 2023 at 09:39:44AM +0800, Michael Wu wrote:
>> This patch fixes a problem that USB mouse can't wake up the device that
>> enters standby.
>
> This not a problem, it is that way by design.

I got it, maybe it's a little problem to say that.

>
>> At present, the kernel only checks whether certain USB manufacturers
>> support wake-up, which will easily cause inconvenience to the
>> development work of other manufacturers and add unnecessary work to the
>> maintenance of kernel.
>>
>> The USB protocol supports judging whether a usb supports the wake-up
>> function, so it should be more reasonable to add a wake-up source by
>> directly checking the settings from the USB protocol.
>
> But you do not do that in this patch, why not?

I just want to explain the background of my patch, to prove we could use
a similar way to avoid such a "disturbing" situation.
To reduce the influence, my patch enables remote wakeup for USB mouse
devices refer to what keyboard do.

>
>> There was a similar issue on the keyboard before, which was fixed by
>> this patch (3d61510f4eca), but now the problem happened on the mouse.
>> This patch uses a similar idea to fix this problem.
>>
>> Signed-off-by: Michael Wu <michael@allwinnertech.com>
>> ---
>> drivers/hid/usbhid/hid-core.c | 8 ++++++++
>> drivers/hid/usbhid/usbmouse.c | 1 +
>> 2 files changed, 9 insertions(+)
>>
>> diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
>> index be4c731aaa65..d3a6755cca09 100644
>> --- a/drivers/hid/usbhid/hid-core.c
>> +++ b/drivers/hid/usbhid/hid-core.c
>> @@ -1189,6 +1189,14 @@ static int usbhid_start(struct hid_device *hid)
>> device_set_wakeup_enable(&dev->dev, 1);
>> }
>>
>> + /**
>> + * NOTE: enable remote wakeup by default for all mouse devices
>> + * supporting the boot protocol.
>> + */
>> + if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
>> + interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
>> + device_set_wakeup_enable(&dev->dev, 1);
>
> Sorry, but we can not take this unless it is proven that this will work
> properly for all of these devices. Other operating systems do not do
> this last I checked, so there will be problems.

As Mario Limonciello says, they has confirmed that the Microsoft Windows
does set a similar policy as well. Can we talk about more in this topic:
why does Linux not support it?
Of course, if you have other great idea, I will appreciate that if we
can have some further discussion.

>
> thanks,
>
> greg k-h

--
Regards,
Michael Wu

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