> -----Original Message----- > From: Venu Byravarasu > Sent: Wednesday, February 20, 2013 2:30 PM > To: 'Marc Dietrich'; Stephen Warren > Cc: linux-tegra@xxxxxxxxxxxxxxx > Subject: RE: unhandled interrupt from otg port > > > > -----Original Message----- > > From: Marc Dietrich [mailto:marvin24@xxxxxx] > > Sent: Wednesday, February 20, 2013 2:21 PM > > To: Stephen Warren > > Cc: linux-tegra@xxxxxxxxxxxxxxx; Venu Byravarasu > > Subject: Re: unhandled interrupt from otg port > > > > Am Dienstag, 19. Februar 2013, 15:24:44 schrieb Stephen Warren: > > > On 02/19/2013 03:17 PM, Marc Dietrich wrote: > > > > On Tuesday 19 February 2013 23:12:53 Marc Dietrich wrote: > > > >> Stephen, > > > >> > > > >> On Tuesday 19 February 2013 10:03:47 Stephen Warren wrote: > > > >>> On 02/17/2013 04:48 AM, Marc Dietrich wrote: > > > >>>> Hi, > > > >>>> > > > >>>> I sometimes see unhandled irq from the otg port on my AC100 > (kernel > > > >>>> 3.8.0-rc7). This happens randomly when the a cable is pluged into > the > > > >>>> mini usb port. Seems the port generates an interrupt on probe > which > > > >>>> isn't handled. > > > >>> > > > >>> Perhaps Venu can explain this; he is our USB expert. > > > >>> > > > >>>> Any ideas? > > > >>> > > > >>> I'm slightly confused by your description though; I assume this > problem > > > >>> happens when you boot with a USB cable already plugged in, not > when > > you > > > >>> first boot the system, then plug in a cable? Is the cable connected to a > > > >>> host PC, or to a device? > > > >> > > > >> the cable is connected to a host PC. It is not shown when connecting > > > >> after the system has booted. Unfortunately, I cannot generate the > error > > > >> reproducible, e.g. I just tried 10 times and nothing was shown. Maybe > > > >> just forget it for now if no one has an obvious idea. I'll try to find > > > >> some reproducable situation and will report back. > > > > > > > > arr, just found it: it happens when you load an uboot image via > tegrarcm > > > > first - so this could be a kernel or uboot problem. > > > > > > Ah, so that means that the Tegra boot ROM already initialized the USB > > > port in device mode to receive U-Boot. I assume you're not touching USB > > > in U-Boot at all, but loading the kernel/... from SD/eMMC. Then, the > > > kernel initializes/uses USB in host mode (since that's all we support so > > > far), and then you see the issue. > > > > yes, sounds reasonable. > > > > > I reproduced this on Harmony. I'll file a bug and assign it to Venu. > > > > Reproduced the issue on Ventana. > Debug is in progress. Fix is pushed for external review with http://marc.info/?l=linux-usb&m=136203353205291&w=2 > > Thanks, > Venu > > > Thanks! > > > > Marc -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
