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Date: Thu, 26 Jan 2017 09:17:33 +0100 From: Ingo Molnar <mingo@...nel.org> To: Lu Baolu <baolu.lu@...ux.intel.com> Cc: Peter Zijlstra <peterz@...radead.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Mathias Nyman <mathias.nyman@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, tglx@...utronix.de, linux-usb@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz> Subject: Re: [PATCH v5 1/4] usb: dbc: early driver for xhci debug capability * Lu Baolu <baolu.lu@...ux.intel.com> wrote: > Hi Ingo, > > On 01/26/2017 03:19 PM, Ingo Molnar wrote: > > * Lu Baolu <baolu.lu@...ux.intel.com> wrote: > > > >> Fair enough. > >> > >> USB connection is stable enough, unless the user unplugs the > >> USB cable during debugging. > > What does the hardware do in this case? The XHCI registers are in the host > > hardware, so they won't disappear, right? Is there some cable connection status > > bit we can extract without interrupts? > > Yes, there are register bits for us to know the cable status. I will go > through the spec again and give you more accurate answer later. Ok, that's good news - so we don't really have to time out and we don't have to rely on the user holding the phone right either. > I'm sorry. I will be off during the next 7 days for Chinese New Year > holiday. My email access will be very limited during this time. I will > revisit this thread after I am back from holiday. > > Sorry for the inconvenience. No problem, have fun! Thanks, Ingo
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