Subject: Re: patch: problem with sco
From: Marcel Holtmann <marcel@holtmann.org>
To: Wolfgang Walter <wolfgang.walter@studentenwerk.mhn.de>
Cc: bluez-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
       maxk@qualcomm.com
In-Reply-To: <200601120138.31791.wolfgang.walter@studentenwerk.mhn.de>
References: <200601120138.31791.wolfgang.walter@studentenwerk.mhn.de>
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Date: Thu, 12 Jan 2006 10:14:04 +0100
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Hi Wolfgang,

> A friend and I encountered a problem with sco transfers to a headset using
> linux (vanilla 2.6.15). While all sco packets sent by the headset were
> received there was no outgoing traffic.
> 
> After switching debugging output on we found that actually sco_cnt was always
> zero in hci_sched_sco.
> 
> hciconfig hci0 shows sco_mtu to be 64:0. Changing that to 64:8 did not help.
> 
> This was because in hci_cc_info_param hdev->sco_pkts is set to zero. When we
> changed this line so that hdev->sco_pkts is set to 8 if bs->sco_max_pkt is 0
> sco transfer to the headset started to work just fine.

send in the information from "hciconfig -a" for this device, because
this is a hardware bug and you can't be sure that you can have eight
outstanding SCO packets.

I personally prefer to implement this as a quirk which can be activated
by the driver. Once I have seen the device information, I will think
about how we might deal with it.

Regards

Marcel


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