Hi,
We are using TDI based High speed USB EHCI controller.
Linux version is 2.6.12
I think that I see the problem with scheduling on Interrupt endpoints.
When High speed USB device has Interrupt endpoint with bInterval value
1,
it means that polling on Interrupt endpoint should be done on each
uframe 2 ^ (1-1) = 1;
When Interrupt endpoint has bInterval value = 2, it means that
polling on Interrupt endpoint should be done on each second uframe 2 ^
(2-1) = 2;
Function qh_make() in the file ehci-q.c don't allow to use endpoints
with bInterval = 2.
See the following portion of code on line 668:
qh->period = urb->interval >> 3;
if (qh->period == 0 && urb->interval != 1) {
/* NOTE interval 2 or 4 uframes could
work.
* But interval 1 scheduling is simpler,
and
* includes high bandwidth.
*/
dbg ("intr period %d uframes, NYET!",
urb->interval);
goto done;
}
Accordingly with this code I understand that "qh->period" field means
polling period in frames.
But how I can define polling period in uframes ?
Thanks
Dima
Dmitri Epshtein - Software engineer
Marvell Semiconductor Israel Ltd
6 Hamada Street
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