On Wed, 1 Jun 2011, Tanya Brokhman wrote:
> Hi Sarah, Alan,
>
> I was trying to enumerate a FS device using dummy_hcd but unfortunately it
> didn't work. The enumeration failed because "parent hub has no TT". I
> searched the code and saw that the hub->tt.hub is set if bDeviceProtocol=1,
> when according to usb2_rh_dev_descriptor (defined in hcd.c)
> bDeviceProtocol=0, meaning, no TT.
I thought a fix for this had been sent in, but apparently not.
> So I have 2 questions:
> 1. Was dummy_hcd ever tested with FS devices?
I don't know. In fact, I'm not sure whether we have any
full-speed-only gadget drivers.
> 2. How this is working for a real HS root hub? I'm sorry for asking this,
> but I didn't find it in the code and we don't have any convenient tools for
> host debugging so it's not so trivial.
The fix is indeed trivial. I'll submit this to Greg shortly, but you
can start using it now.
Alan Stern
drivers/usb/gadget/dummy_hcd.c | 1 +
1 file changed, 1 insertion(+)
Index: usb-3.0/drivers/usb/gadget/dummy_hcd.c
===================================================================
--- usb-3.0.orig/drivers/usb/gadget/dummy_hcd.c
+++ usb-3.0/drivers/usb/gadget/dummy_hcd.c
@@ -1906,6 +1906,7 @@ static int dummy_hcd_probe(struct platfo
if (!hcd)
return -ENOMEM;
the_controller = hcd_to_dummy (hcd);
+ hcd->has_tt = 1;
retval = usb_add_hcd(hcd, 0, 0);
if (retval != 0) {
--
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