Re: [Bluez-devel] Problem with hci_usb

[Marcel Holtmann <marcel@holtmann.org>]

Hi Nils,

> I just found a quite strange problem with the hci_usb driver.
> We have a Fujitsu Siemens Lifebook with builtin Bluetooth here. This
> seems to be a CSR chipset connected via USB internally.
> The problem is that the chipset is set to SCO-PCM not SCO-HCI.
> Subsequently when SCO is enabled in the hci_usb driver something goes
> wrong and the usb-uhci driver constanly generates interrupts which are
> accounted to the UHCI and as ERR interrupts (in /proc/interrupts).
> Enabling debugging for USB does not produce anything new.
> What helped a lot is to disable the SCO option for the hci_usb driver.
> But this solution is quite unsatisfying since externally connected USB
> Bluetooth dongles would bow also not be able to use SCO over HCI even if
> they support it.

these are the ISOC transfers. The fix is to submit the ISOC URB's only
when we really have a SCO connection and don't consume USB bandwith with
ISOC URB's when they are not needed.

> The hci_usb in 2.6.3 must be somewhat different.
> It reports unsupported isochronous URBs (sorry, might be wrong, this is
> from my memory since I do not have 2.6.3 logs anymore) and disbled it at
> device startup. No more unnecessary interrupts and especially no ERR
> interrupts here.

This should be fixed in 2.6.4-rc1 and 2.6.3-mh3.

> So, are those changes also available as patch to fix the 2.4.25 driver?
> The current 2.4.25-mh1 patch at least does not seem to include a fix for
> this problem...

Currently there is no real fix for it and once we have one, I have no
plans to backport it to 2.4.

> Apart from that, works like a charm! (Oh, I had to increase the USB
> hub.c DEBOUNCE_TIMEOUT from 400 to 1500 to make the device detect
> work...)

This should be send to the USB guys.

Regards

Marcel




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