[Qemu-devel] Isochronous problem with usb OHCI

[Qemu-devel] Isochronous problem with usb OHCI

[ML_PierreLeMagourou]

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

[Qemu-devel] Isochronous problem with usb OHCI

[Pierre Le Magourou]

[-- Attachment #1: Type: text/plain, Size: 802 bytes --]

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

[-- Attachment #2: Type: text/html, Size: 876 bytes --]

Re: [Qemu-devel] Isochronous problem with usb OHCI

[baibai_tao]

I met the same problem when using usb-ohci.c with usb-linux.c and usb.c in
head version.
Comparing usb-ohci.c on head and in 0.9.1, there is little difference but
the other 2 files are totally different. 
It could work if I pickup  usb-linux.c and usb.c from 0.9.1.


Pierre Le Magourou wrote:
> 
> Hi,
> 
> 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
> 
> 

-- 
View this message in context: http://www.nabble.com/Isochronous-problem-with-usb-OHCI-tp20542659p20914766.html
Sent from the QEMU - Dev mailing list archive at Nabble.com.