: Wednesday, 03 September 2014 6:16 PM
To: Christian Melki
Cc: linux-usb@vger.kernel.org
Subject: Re: EHCI Isochronous schedule full?
On Wed, 3 Sep 2014, Christian Melki wrote:
I've probably got this wrong...
I try to run several cameras with compressed streams (MJPEG) using maxpacket
3*1024 isoc
On Thu, 4 Sep 2014, Christian Melki wrote:
Hi Alan.
The machine has only two cameras inserted (no hids, nothing else).
While the cameras have an interrupt endpoint, I disabled it in
uvc_video. Still I don't get more than two cameras into the schedule.
So there are no interrupt endpoints
I've probably got this wrong...
I try to run several cameras with compressed streams (MJPEG) using maxpacket
3*1024 isoc-endpoints.
EHCI should be able to transmit 8 microframes * 1024 bytes * 3 packets of data
per frame (approx 24MB/sec).
Two cameras work fine, but when I connect a third
It does not matter if I reduce resolution to 640x480x1 fps.
I still can only use two cameras. maxpacket requirement for those streams drop
a bit, but it doesn't help.
Kernel is 3.6.4, powerpc 8347 machine.--
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