Hi,
> -----Original Message----- > From: Lu Baolu [mailto:baolu...@linux.intel.com] > Sent: Tuesday, July 12, 2016 8:42 AM > To: Lipengcheng; gre...@linuxfoundation.org; st...@rowland.harvard.edu; > chasemetzge...@gmail.com; mathias.ny...@linux.intel.com; > oneu...@suse.com; jun...@freescale.com > Cc: linux-...@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH] usb:solve resume usb device identification problem > > Hi, > > On 07/11/2016 08:57 PM, Pengcheng Li wrote: > > A usb device in the connection state. Then host is suspend and resume. > > But the usb device could not be at the right speed. We should be reset > > the reset. > > Have you tried applying XHCI_RESET_ON_RESUME quirk to your host controller > driver? Is your usb device self powered? > I do not apply XHCI_RESET_ON_RESUME quir to my host controller driver. I select no pci platform. Our usb device is not self powered. > Best regards, > Lu Baolu > > > > > Signed-off-by: Pengcheng Li <lpc...@hisilicon.com> > > --- > > drivers/usb/core/hub.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index > > bee1351..cd71bb3 100644 > > --- a/drivers/usb/core/hub.c > > +++ b/drivers/usb/core/hub.c > > @@ -3455,7 +3455,7 @@ int usb_port_resume(struct usb_device *udev, > > pm_message_t msg) > > struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); > > struct usb_port *port_dev = hub->ports[udev->portnum - 1]; > > int port1 = udev->portnum; > > - int status; > > + int status, retval; > > u16 portchange, portstatus; > > > > if (!test_and_set_bit(port1, hub->child_usage_bits)) { @@ -3512,6 > > +3512,10 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg) > > } > > } > > > > + retval = hub_port_reset(hub, port1, udev, HUB_ROOT_RESET_TIME, false); > > + if (retval < 0) > > + hub_port_disable(hub, port1, 0); > > + > > if (udev->persist_enabled) > > status = wait_for_connected(udev, hub, &port1, &portchange, > > &portstatus); Best regards Pengcheng Li
