linux-kernel - Re: [PATCH 0/1] Fixes to the USB 3.0 detection as 2.0 on AMD platform

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Date:	Fri, 11 Jul 2014 17:04:04 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Gavin Guo <gavin.guo@...onical.com>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	"Nyman, Mathias" <mathias.nyman@...el.com>,
	linux-usb@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	YK <yk@...onical.com>, Anthony Wong <anthony.wong@...onical.com>,
	Gerald Yang <gerald.yang@...onical.com>
Subject: Re: [PATCH 0/1] Fixes to the USB 3.0 detection as 2.0 on AMD platform

On Sat, Jul 12, 2014 at 07:32:34AM +0800, Gavin Guo wrote:
> Hi all,
> 
> On Fri, Jul 11, 2014 at 2:22 PM, Gavin Guo <gavin.guo@...onical.com> wrote:
> > Hi Sarah and Mathias,
> >
> > As the discussion in http://comments.gmane.org/gmane.linux.usb.general/107011,
> > I found that [AMD] FCH USB XHCI Controller [1022:7814] the USB 3.0 disk
> > can't work in SuperSpeed after several times of hotplug. After doing some
> > experiments and bisection, I found the bug is caused by
> > 41e7e056cdc662f704fa9262e5c6e213b4ab45dd (USB: Allow USB 3.0 ports to be
> > disabled.). And the bug can be fixed by not executing the
> > hub_usb3_port_disable() function. I also found that the port status is
> > already in RxDetect before setting the port to Disabled in
> > hub_usb3_port_disable() function. So, there are 2 ways to fix the bug:
> >
> > 1) Check if the Vendor/Device id is [1022:7814] at the beginning of
> > hub_usb3_port_disable() function. If yes, return without executing the
> > remaining code.
> >
> > 2) Check if the port status is already in RxDetect, if yes, return without
> > executing the remaining code.
> >
> > The second method seems more reasonable, so the patch is the implementation
> > of the second one. But it will affect more platforms and I don't know if
> > there'll be any negative result. Otherwise, if the first one is correct,
> > I can reimplement a new one.
> >
> > I'm appreciated if you can give me some advice, or if there is any thing I missed.
> >
> > Thanks,
> > Gavin
> >
> > Gavin Guo (1):
> >   usb: Check if port status is equal to RxDetect
> >
> >  drivers/usb/core/hub.c | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >
> > --
> > 2.0.0
> >
> 
> Add Greg k-h to the list.

Why?  Mathias can handle this just fine, right?

And I read all linux-usb@...r email anyway...

greg k-h
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