On Wed, Jan 15, 2014 at 09:55:59PM -0500, Jarod Wilson wrote:
> On Wed, Jan 15, 2014 at 04:52:45PM +0000, Sean Young wrote:
> > On Wed, Jan 15, 2014 at 01:49:17PM -0200, Mauro Carvalho Chehab wrote:
> > > Hi Martin,
> > >
> > > Em Wed, 11 Dec 2013 21:34:55 +0100
> > > Martin Kittel <linux@xxxxxxxxxxxxxxxx> escreveu:
> > >
> > > > Hi Mauro, hi Sean,
> > > >
> > > > thanks for considering the patch. I have added an updated version at the
> > > > end of this mail.
> > > >
> > > > Regarding the info Sean was requesting, it is indeed an xhci hub. I also
> > > > added the details of the remote itself.
> > > >
> > > > Please let me know if there is anything missing.
> > > >
> > > > Best wishes,
> > > >
> > > > Martin.
> > > >
> > > >
> > > > lsusb -vvv
> > > > ------
> > > > Bus 001 Device 002: ID 2304:0225 Pinnacle Systems, Inc. Remote Kit
> > > > Infrared Transceiver
> > > > Device Descriptor:
> > > > bLength 18
> > > > bDescriptorType 1
> > > > bcdUSB 2.00
> > > > bDeviceClass 0 (Defined at Interface level)
> > > > bDeviceSubClass 0
> > > > bDeviceProtocol 0
> > > > bMaxPacketSize0 8
> > > > idVendor 0x2304 Pinnacle Systems, Inc.
> > > > idProduct 0x0225 Remote Kit Infrared Transceiver
> > > > bcdDevice 0.01
> > > > iManufacturer 1 Pinnacle Systems
> > > > iProduct 2 PCTV Remote USB
> > > > iSerial 5 7FFFFFFFFFFFFFFF
> > > > bNumConfigurations 1
> > > > Configuration Descriptor:
> > > > bLength 9
> > > > bDescriptorType 2
> > > > wTotalLength 32
> > > > bNumInterfaces 1
> > > > bConfigurationValue 1
> > > > iConfiguration 3 StandardConfiguration
> > > > bmAttributes 0xa0
> > > > (Bus Powered)
> > > > Remote Wakeup
> > > > MaxPower 100mA
> > > > Interface Descriptor:
> > > > bLength 9
> > > > bDescriptorType 4
> > > > bInterfaceNumber 0
> > > > bAlternateSetting 0
> > > > bNumEndpoints 2
> > > > bInterfaceClass 255 Vendor Specific Class
> > > > bInterfaceSubClass 0
> > > > bInterfaceProtocol 0
> > > > iInterface 4 StandardInterface
> > > > Endpoint Descriptor:
> > > > bLength 7
> > > > bDescriptorType 5
> > > > bEndpointAddress 0x81 EP 1 IN
> > > > bmAttributes 2
> > > > Transfer Type Bulk
> > > > Synch Type None
> > > > Usage Type Data
> > > > wMaxPacketSize 0x0040 1x 64 bytes
> > > > bInterval 10
> > >
> > > Hmm... interval is equal to 10, e. g. 125us * 2^(10 - 1) = 64 ms.
> > >
> > > I'm wandering why mceusb is just forcing the interval to 1 (125ms). That
> > > sounds wrong, except, of course, if the endpoint descriptor is wrong.
> >
> > Note that the endpoint descriptor describes it as a bulk endpoint, but
> > it is used as a interrupt endpoint by the driver. For bulk endpoints,
> > the interval should not be used (?).
> >
> > Maybe the correct solution would be to use the endpoints as bulk endpoints
> > if that is what the endpoint says? mceusb devices come in interrupt and
> > bulk flavours.
>
> Yeah, I just went through a number of my devices here. I have the same
> pinnacle one with bulk and 10, a topseed with bulk and 1, a topseed with
> interrupt and 0, a philips with bulk and 0... There's a pretty nasty mix
> of them. The interrupt and 0 one actually winds up with a default
> bInterval of 32 from the usb subsystem, but the bulk/0 one sticks with a
> default of 0.
>
> Something to properly handle bulk vs. interrupt might be useful, but at
> least at first glance here, simply saying
>
> if (ep_{in,out}->bInterval == 0)
> ep_{in,out}->bInterval = 8;
>
> seems to work just fine here with the stack of mceusb devices I've tried
> so far (all hooked to usb 1.1 and/or usb 2.0 ports).
I have one device with bulk endpoints, an acer device. I cannot get it to
work on an xhci hub at all. The xhci host just returns completion code
4 (tx error), indicating that the client device did not respond correctly.
I'm trying the logic analyzer but so far no luck getting it to decode usb.
At least for this bug the bInterval is just a red herring.
Sean
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