The following reply was made to PR usb/181987; it has been noted by GNATS.

From: SAITOU Toshihide <to...@ruby.ocn.ne.jp>
To: freebsd-gnats-sub...@freebsd.org
Cc:  
Subject: Re: usb/181987: USB isochronous transfer of the USB driver (Mentor
 Graphics OTG: musb_otg) is not working.
Date: Tue, 15 Oct 2013 22:17:17 +0900 (JST)

 In message: <525ce936.70...@bitfrost.no>
             Hans Petter Selasky <h...@bitfrost.no> writes:
 > On 09/10/13 13:01, SAITOU Toshihide wrote:
 >>
 >>> Number:         181987
 >>> Category:       usb
 >>> Synopsis: USB isochronous transfer of the USB driver (Mentor
 >>> Graphics OTG: musb_otg) is not working.
 >>> Confidential:   no
 >>> Severity:       non-critical
 >>> Priority:       low
 >>> Responsible:    freebsd-usb
 >>> State:          open
 >>> Quarter:
 >>> Keywords:
 >>> Date-Required:
 >>> Class:          sw-bug
 >>> Submitter-Id:   current-users
 >>> Arrival-Date:   Tue Sep 10 11:10:00 UTC 2013
 >>> Closed-Date:
 >>> Last-Modified:
 >>> Originator:     SAITOU Toshihide
 >>> Release:        FreeBSD 10.0-CURRENT
 >>> Organization:
 >>> Environment:
 >> FreeBSD bbb 10.0-CURRENT FreeBSD 10.0-CURRENT #1: Mon Sep 9
 >> 23:34:15 JST 2013
 >> toshi@fbsd:/usr/obj/arm.armv6/usr/src/sys/BEAGLEBONE arm
 >>
 >>> Description:
 >> The patch attached is somewhat fixed the problem for the
 >> LOGICOOL C920 but still most UVC devices are not working.
 >>
 >> My guess is that the not working device requires three
 >> transactions per *microframe* for the data transfer rate as
 >> the video streaming but the current driver performs one
 >> transaction per microframe. The following page imply the
 >> existence of the undocumented setting to perform so.
 >> http://e2e.ti.com/support/embedded/wince/f/353/t/68966.aspx
 >>
 >>> How-To-Repeat:
 >>
 >>> Fix:
 >>
 >>
 >>> Release-Note:
 >>> Audit-Trail:
 >>> Unformatted:
 >> _______________________________________________
 >> freebsd-usb@freebsd.org mailing list
 >> http://lists.freebsd.org/mailman/listinfo/freebsd-usb
 >> To unsubscribe, send any mail to
 >> "freebsd-usb-unsubscr...@freebsd.org"
 >>
 > 
 > Hi,
 > 
 > Can you please test the attached patch and report back?
 > 
 > --HPS
 
 I tried to use a UVC device using libusb but couldn't get
 the data. The latter patch was the same result.
 
 FreeBSD revision is 255933.
 
 When libusb_submit_transfer's call back is called,
 actual_length of libusb_iso_packet_descriptor is 0 or 12.
 
 A snippet of ``sysctl hw.usb.debug=4'' is below:
 
 musbotg_device_isoc_enter: start next=537
 musbotg_ep_int_set: ep_no=1, on=1
 musbotg_host_data_rx: ep_no=1
 musbotg_host_data_rx: csr=0x01
 musbotg_host_data_rx: csrh=0x00
 musbotg_interrupt: real endpoint interrupt rx=0x0002, tx=0x0000
 musbotg_host_data_rx: ep_no=1
 musbotg_host_data_rx: csr=0x01
 musbotg_host_data_rx: count=0x0a80
 musbotg_channel_free: ep_no=1
 musbotg_ep_int_set: ep_no=1, on=0
 musbotg_device_done: xfer=0xc2c080c0, endpoint=0xc2ac3cb8, error=22
 
 It seems that more data are collected...
 
 
 Thanks,
 -- 
 SAITOU Toshihide
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