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[Qemu-devel] Isochronous problem with usb OHCI
From: |
ML_PierreLeMagourou |
Subject: |
[Qemu-devel] Isochronous problem with usb OHCI |
Date: |
Mon, 17 Nov 2008 13:35:18 +0000 |
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