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

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Message-ID: <CAGCq0La_PJsTWWbzGzf-+R6yTra5mAxTcVRQAaJF4DTbz4jO3w@mail.gmail.com>
Date:   Wed, 29 Dec 2021 13:55:22 +0800
From:   Puma Hsu <pumahsu@...gle.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     mathias.nyman@...el.com, Greg KH <gregkh@...uxfoundation.org>,
        Albert Wang <albertccwang@...gle.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: re-initialize the HC during resume if HCE was set

On Tue, Dec 28, 2021 at 10:34 PM Sergey Shtylyov <s.shtylyov@....ru> wrote:
>
> Hello!
>
> On 12/28/21 9:02 AM, Puma Hsu wrote:
>
> > When HCE(Host Controller Error) is set, it means an internal
> > error condition has been detected. It needs to re-initialize
> > the HC too.
> >
> > Signed-off-by: Puma Hsu <pumahsu@...gle.com>
> > ---
> >  drivers/usb/host/xhci.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index dc357cabb265..c546d9533410 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -1146,8 +1146,8 @@ 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) || (temp & STS_HCE) || hibernated) {
>
>         if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
>
> [...]
>
> MBR, Sergey

Thanks for advising, I will submit patch v2.