From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: yfw <nh26223@gmail.com>, Bin Liu <b-liu@ti.com>,
linux-usb@vger.kernel.org, linux-media@vger.kernel.org
Subject: Re: g_webcam Isoch high bandwidth transfer
Date: Mon, 26 Sep 2016 19:06:23 +0300 [thread overview]
Message-ID: <1685763.WH6ULF9Rxs@avalon> (raw)
In-Reply-To: <87k2e358cx.fsf@linux.intel.com>
Hi Felipe,
On Friday 23 Sep 2016 11:27:26 Felipe Balbi wrote:
> yfw <nh26223@gmail.com> writes:
> >>>>>> Here's one that actually compiles, sorry about that.
> >>>>>
> >>>>> No worries, I was sleeping ;-)
> >>>>>
> >>>>> I will test it out early next week. Thanks.
> >>>>
> >>>> meanwhile, how about some instructions on how to test this out myself?
> >>>> How are you using g_webcam and what are you running on host side? Got a
> >>>> nice list of commands there I can use? I think I can get to bottom of
> >>>> this much quicker if I can reproduce it locally ;-)
> >>>
> >>> On device side:
> >>> - first patch g_webcam as in my first email in this thread to enable
> >>> 640x480@30fps;
> >>> - # modprobe g_webcam streaming_maxpacket=3072
> >>> - then run uvc-gadget to feed the YUV frames;
> >>> http://git.ideasonboard.org/uvc-gadget.git
> >>
> >> as is, g_webcam never enumerates to the host. It's calls to
> >> usb_function_active() and usb_function_deactivate() are unbalanced. Do
> >> you have any other changes to g_webcam?
> >
> > With uvc function gadget driver, user daemon uvc-gadget must be started
> > before connect to host. Not sure whether g_webcam has same requirement.
>
> f_uvc.c should be handling that by means for usb_function_deactivate().
>
> I'll try keeping cable disconnected until uvc-gadget is running.
Things might have changed since we've discussed the issue several years ago,
but back then at least the musb UDC started unconditionally connected.
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2016-09-26 16:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 17:04 g_webcam Isoch high bandwidth transfer Bin Liu
2016-09-21 8:01 ` Felipe Balbi
2016-09-21 13:27 ` Bin Liu
2016-09-21 14:58 ` Bin Liu
2016-09-22 7:37 ` Felipe Balbi
2016-09-22 8:08 ` Felipe Balbi
2016-09-22 10:06 ` Felipe Balbi
2016-09-22 13:33 ` Bin Liu
2016-09-22 19:48 ` Felipe Balbi
2016-09-22 20:11 ` Bin Liu
2016-09-23 0:23 ` yfw
2016-09-23 7:49 ` Felipe Balbi
2016-09-23 8:10 ` yfw
2016-09-23 8:27 ` Felipe Balbi
2016-09-26 16:06 ` Laurent Pinchart [this message]
2016-09-27 7:10 ` Felipe Balbi
2016-09-26 14:02 ` Bin Liu
2016-09-27 7:14 ` Felipe Balbi
2016-09-26 16:03 ` Laurent Pinchart
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