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Date: Mon, 17 Nov 2008 17:20:38 +0100
From: "Pierre Le Magourou" <lemagoup@gmail.com>
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Subject: [Qemu-devel] Isochronous problem with usb OHCI
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Hi,

I try to use a webcam (logitech E 3500) through Qemu USB OHCI and have a
problem with isochronous frames. Here is a little description :

When Isochronous traces are activated I can see that isochronous packets
come from the host (async_complete function in usb-linux.c). These packets
are then completed in hw/usb-ohci.c, there it calls ohci_process_lists
function with completion parameter set to 1. The problem is that it then
does not call the ohci_service_ed_list function in order to finish the
isochronous packet completion and send it to the target. The OHCIState->ctl
is neither a control nor a bulk list.

In fact, I wonder what is the normal behavior for an isochronous packet
completion. Does someone have had a similar problem with isochronous frames
when using usb ohci ?

--
Pierre

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<font><font size="2">Hi,<br>
<br>
I try to use a webcam (logitech E 3500) through Qemu USB OHCI and have
a problem with isochronous frames. Here is a little description :<br>
<br>
When Isochronous traces are activated I can see that isochronous
packets come from the host (async_complete function in usb-linux.c).
These packets are then completed in hw/usb-ohci.c, there it calls
ohci_process_lists function with completion parameter set to 1. The
problem is that it then does not call the ohci_service_ed_list function
in order to finish the isochronous packet completion and send it to the
target. The OHCIState-&gt;ctl is neither a control nor a bulk list.<br>
<br>
In fact, I wonder what is the normal behavior for an isochronous packet
completion. Does someone have had a similar problem with isochronous
frames when using usb ohci ?<br>
<br>
--<br>
Pierre</font></font>

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