linux-kernel - Re: [PATCH v5] xhci: re-initialize the HC during resume if HCE was set

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Date:   Sat, 29 Jan 2022 17:23:12 +0800
From:   Puma Hsu <pumahsu@...gle.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     mathias.nyman@...el.com, Greg KH <gregkh@...uxfoundation.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Albert Wang <albertccwang@...gle.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v5] xhci: re-initialize the HC during resume if HCE was set

On Thu, Jan 27, 2022 at 9:43 PM Mathias Nyman
<mathias.nyman@...ux.intel.com> wrote:
>
> On 19.1.2022 8.40, Puma Hsu wrote:
> > When HCE(Host Controller Error) is set, it means an internal
> > error condition has been detected. Software needs to re-initialize
> > the HC, so add this check in xhci resume.
> >
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Puma Hsu <pumahsu@...gle.com>
> > ---
> > v2: Follow Sergey Shtylyov <s.shtylyov@....ru>'s comment.
> > v3: Add stable@...r.kernel.org for stable release.
> > v4: Refine the commit message.
> > v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@...ux.intel.com>'s comment.
> >
> >  drivers/usb/host/xhci.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index dc357cabb265..41f594f0f73f 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -1146,8 +1146,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
> >               temp = readl(&xhci->op_regs->status);
> >       }
> >
> > -     /* If restore operation fails, re-initialize the HC during resume */
> > -     if ((temp & STS_SRE) || hibernated) {
> > +     /* If restore operation fails or HC error is detected, re-initialize the HC during resume */
> > +     if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
> > +             xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
> > +                       xhci_decode_usbsts(str, temp));
> >
> >               if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
> >                               !(xhci_all_ports_seen_u0(xhci))) {
> >
>
> Tried to compile, something is missing in this patch:
>
> drivers/usb/host/xhci.c:1152:25: error: ‘str’ undeclared (first use in this function); did you mean ‘qstr’?

Sorry for missing the declaration, I will fix it.

> -Mathias