Hello Alan,
On 5/28/2012 8:55 PM, Alan Stern wrote:
2. Is there any flag available which will solve my limitation ? (start
> supporting full speed as well as high speed)
This has nothing to do with flags. Adding a flag to your driver won't
magically enable it to handle full speed communications.
Just for curiosity,
I have passed USB1 from this flag and it starts supporting full speed
device.
When I passed USB2 flag from this and connect a full speed hub, it
reflect "parent hub has no TT". The print is coming from
/* Set up TT records, if needed */
if (hdev->tt) {
udev->tt = hdev->tt;
udev->ttport = hdev->ttport;
} else if (udev->speed != USB_SPEED_HIGH
&& hdev->speed == USB_SPEED_HIGH) {
if (!hub->tt.hub) {
dev_err(&udev->dev, "parent hub has no TT\n");
retval = -EINVAL;
goto fail;
}
}
My debugging says that
1. hdev->speed == USB_SPEED_HIGH comparison is true, but why when I am
attaching a full speed device.
2. The print "parent hub has no TT\n" will only come when there is no
tt.hub. Now this is only possible when hdev->descriptor.bDeviceProtocol
== 0. Could you please guide me from where this field is getting updated?
Best Regards
Rajeev
Alan Stern
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