Re: [PATCH v3] platform/x86/hp: Avoid spurious wakeup on HP ProOne 440

[Hans de Goede <hdegoede@redhat.com>]

Hi Kai-Heng,

On 7-Oct-24 6:22 AM, Kai-Heng Feng wrote:
> Hi Hans,
> 
> On 2024/10/5 10:25 PM, Hans de Goede wrote:
>> Hi Kai-Heng,
>>
>> On 6-Sep-24 7:30 AM, Kai-Heng Feng wrote:
>>> The HP ProOne 440 has a power saving design that when the display is
>>> off, it also cuts the USB touchscreen device's power off.
>>>
>>> This can cause system early wakeup because cutting the power off the
>>> touchscreen device creates a disconnect event and prevent the system
>>> from suspending:
>>> [  445.814574] hub 2-0:1.0: hub_suspend
>>> [  445.814652] usb usb2: bus suspend, wakeup 0
>>> [  445.824629] xhci_hcd 0000:00:14.0: Port change event, 1-11, id 11, portsc: 0x202a0
>>> [  445.824639] xhci_hcd 0000:00:14.0: resume root hub
>>> [  445.824651] xhci_hcd 0000:00:14.0: handle_port_status: starting usb1 port polling.
>>> [  445.844039] xhci_hcd 0000:00:14.0: PM: pci_pm_suspend(): hcd_pci_suspend+0x0/0x20 returns -16
>>> [  445.844058] xhci_hcd 0000:00:14.0: PM: dpm_run_callback(): pci_pm_suspend+0x0/0x1c0 returns -16
>>> [  445.844072] xhci_hcd 0000:00:14.0: PM: failed to suspend async: error -16
>>> [  446.276101] PM: Some devices failed to suspend, or early wake event detected
>>>
>>> So add a quirk to make sure the following is happening:
>>> 1. Let the i915 driver suspend first, to ensure the display is off so
>>>     system also cuts the USB touchscreen's power.
>>> 2. Wait a while to let the USB disconnect event fire and get handled.
>>> 3. Since the disconnect event already happened, the xhci's suspend
>>>     routine won't be interrupted anymore.
>>>
>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>>
>> I was wondering if there is any progress in trying to come up with
>> a more generic fix at the USB hub level for this as discussed in
>> other emails in this thread ?
> 
> This patch fixes this issue and IMO quite generic:
> https://lore.kernel.org/linux-usb/20240906030548.845115-1-duanchenghao@kylinos.cn/

It looks like during review the patch has changes and now it only applies
to S4 / hibernate.

So I guess we may need something similar for S3 / s2idle suspend ?

Regards,

Hans