Return-Path: Subject: Re: [Bluez-devel] Problem with hci_usb From: Marcel Holtmann To: Nils Faerber Cc: BlueZ Mailing List In-Reply-To: <1078247120.9057.85.camel@localhost> References: <1078247120.9057.85.camel@localhost> Content-Type: text/plain Message-Id: <1078248609.1942.183.camel@pegasus> Mime-Version: 1.0 Sender: bluez-devel-admin@lists.sourceforge.net Errors-To: bluez-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Date: Tue, 02 Mar 2004 18:30:10 +0100 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 ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Bluez-devel mailing list Bluez-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-devel