#1045: USB isochronous streams
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Reporter: wkornewald | Owner: nobody
Type: enhancement | Status: assigned
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/pre-alpha1
Resolution: | Keywords:
Blocked By: | Blocking: 10521, 11256
Platform: All |
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Comment (by rudolfc):
I'll upload the part showing the error with default logging. You state
nothing else runs into this problem, but I suspect that's just what you
saw and/or what was recognized as belonging there. When you are working on
the 'interface' between electronics and firm/software these things are
more or less daily routine/trouble.. I lost count for instance in how many
occasions the specs were inconclusive or just plain wrong (at my work
place).
Anyhow, for this case I suspect it's not just the device that is slow, it
might also be connected to the power/ramp-up inside the host or it's local
power supply and especially the combination of 'slow' devices with such
host controller. As stated before, I also see a lot of trouble on my
surface 3 which also uses the xhci driver: though at this point it remains
to be seen if it would be solved there with the timing update we are
looking at. (when the driver is updated I can test that since it's
practically impossible to do that with a non-packaged solution I fear
which seems needed on UEFI (I might be mistaken in case of usb bus
drivers)
BTW I did also modify/test with usb's hub.cpp where I originally suspected
the timing error: but relaying there, or just not exec'ing the debounce
routine did not solve the audio card problem.
For usb_audio even the header file we have is still incomplete
(USB_audio.h). It does not support v2 audio spec (missing pieces): I had
to expand it a little for my tests.
For my test (nasty test, I am learning to understand stuff piece by piece)
indeed the usb_audio driver is loaded, buffers are created, (some)
controls get created in Media prefs, etc. No audio yet (was to be expected
due to new clocking mechanism at least in audio spec v2), and on top of it
all the usb bus hangs (until I unplug and replug a few times). I'll not
waste your time with further details and I don't dare sharing this 'code'
currently).
Thanks for looking at my report!
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Ticket URL: <https://dev.haiku-os.org/ticket/1045#comment:38>
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