linux-kernel - Re: [PATCH 1/2] xhci: Apply reset resume quirk to Etron EJ188 xHCI host

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Date: Thu, 23 May 2024 13:33:00 +0800
From: 蔣光益 <ki.chiang65@...il.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: mathias.nyman@...el.com, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] xhci: Apply reset resume quirk to Etron EJ188 xHCI host

Hi Greg,

Greg KH <gregkh@...uxfoundation.org> 於 2024年5月22日 週三 下午12:36寫道：
>
> On Wed, May 22, 2024 at 10:39:18AM +0800, Kuangyi Chiang wrote:
> > As described in commit c877b3b2ad5c ("xhci: Add reset on resume quirk for
> > asrock p67 host"), EJ188 have the same issue as EJ168, where completely
> > dies on resume. So apply XHCI_RESET_ON_RESUME quirk to EJ188 as well.
> >
> > Signed-off-by: Kuangyi Chiang <ki.chiang65@...il.com>
> > ---
> >  drivers/usb/host/xhci-pci.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > index ef513c2..a0beb41 100644
> > --- a/drivers/usb/host/xhci-pci.c
> > +++ b/drivers/usb/host/xhci-pci.c
> > @@ -31,6 +31,7 @@
> >
> >  #define PCI_VENDOR_ID_ETRON          0x1b6f
> >  #define PCI_DEVICE_ID_EJ168          0x7023
> > +#define PCI_DEVICE_ID_EJ188          0x7052
> >
> >  #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI   0x8c31
> >  #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI        0x9c31
> > @@ -238,6 +239,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> >               xhci->quirks |= XHCI_TRUST_TX_LENGTH;
> >               xhci->quirks |= XHCI_BROKEN_STREAMS;
> >       }
> > +     if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
> > +                     pdev->device == PCI_DEVICE_ID_EJ188) {
> > +             xhci->quirks |= XHCI_RESET_ON_RESUME;
> > +     }
>
> Same question as on other patch, should this be backported to older
> kernels too?
>
> thanks,
>
> greg k-h

Sorry, I'm new to this.
These patches have been tested in the stable 4.19 kernel, so they
should be backported to stable kernels as old as 4.19, right?

Thanks,
Kuangyi Chiang