linux-kernel - Re: [PATCH] xhci: Remove CONFIG_USB_DEFAULT_PERSIST to prevent xHCI from runtime suspending

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Date:   Thu, 9 Dec 2021 14:42:00 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     mathias.nyman@...el.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci: Remove CONFIG_USB_DEFAULT_PERSIST to prevent xHCI
 from runtime suspending

On Wed, Dec 1, 2021 at 5:00 PM Mathias Nyman
<mathias.nyman@...ux.intel.com> wrote:
>
> On 1.12.2021 2.19, Kai-Heng Feng wrote:
> > On Fri, Nov 19, 2021 at 5:27 PM Kai-Heng Feng
> > <kai.heng.feng@...onical.com> wrote:
> >>
> >> When the xHCI is quirked with XHCI_RESET_ON_RESUME, runtime resume
> >> routine also resets the controller.
> >>
> >> This is bad for USB drivers without reset_resume callback, because
> >> there's no subsequent call of usb_dev_complete() ->
> >> usb_resume_complete() to force rebinding the driver to the device. For
> >> instance, btusb device stops working after xHCI controller is runtime
> >> resumed, if the controlled is quirked with XHCI_RESET_ON_RESUME.
> >>
> >> So always take XHCI_RESET_ON_RESUME into account to solve the issue.
> >>
> >> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> >
> > A gentle ping...
>
> Thanks
> Adding to queue

I haven't found this patch in your repo. Can you please push it so I
can backport it to downstream kernel?

Kai-Heng

>
> -Mathias