From: Clemens Ladisch <clemens@ladisch.de>
To: alsa-devel@alsa-project.org
Cc: tova-dev@tovacompany.com, linux-usb@vger.kernel.org,
Joe Rayhawk <jrayhawk@fairlystable.org>,
alsa-devel@vger.kernel.org
Subject: Re: [alsa-devel] BUG: USB audio discontinuities with 'UHCI: implement new semantics for URB_ISO_ASAP'
Date: Tue, 23 Apr 2013 17:09:35 +0200 [thread overview]
Message-ID: <5176A42F.6080409@ladisch.de> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1304231050510.1679-100000@iolanthe.rowland.org>
Alan Stern wrote:
> On Tue, 23 Apr 2013, Clemens Ladisch wrote:
>> Why is having a queue of two URB with one packet each suddenly not
>> allowed?
>
> It _is_ allowed when URB_ISO_ASAP is clear. I have never fully
> understood why the audio driver sets that flag. By setting it, you are
> telling the host controller driver that you are willing to give up
> reduced latency in order to avoid underruns.
This flag was needed to avoid having to set urb->start_frame.
With the changed queueing API, the audio driver needs to change too.
I'll look into this ...
Regards,
Clemens
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next prev parent reply other threads:[~2013-04-23 15:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20130417183436.GA4381@richardiv.omgwallhack.org>
2013-04-18 16:42 ` BUG: USB audio discontinuities with 'UHCI: implement new semantics for URB_ISO_ASAP' Alan Stern
2013-04-18 16:42 ` [alsa-devel] " Alan Stern
2013-04-18 21:23 ` Joe Rayhawk
2013-04-18 21:23 ` [alsa-devel] " Joe Rayhawk
2013-04-19 15:57 ` Alan Stern
2013-04-19 16:25 ` Clemens Ladisch
2013-04-19 18:18 ` Alan Stern
2013-04-19 18:18 ` [alsa-devel] " Alan Stern
2013-04-20 0:35 ` Joe Rayhawk
2013-04-20 0:35 ` [alsa-devel] " Joe Rayhawk
2013-04-22 15:29 ` Alan Stern
2013-04-22 15:29 ` [alsa-devel] " Alan Stern
2013-04-23 8:47 ` Clemens Ladisch
2013-04-23 8:47 ` [alsa-devel] " Clemens Ladisch
2013-04-23 14:58 ` Alan Stern
2013-04-23 15:09 ` Clemens Ladisch [this message]
2013-04-23 15:23 ` Alan Stern
2013-04-23 15:23 ` Alan Stern
2013-04-23 15:09 ` Clemens Ladisch
2013-04-23 14:58 ` Alan Stern
2013-04-19 16:25 ` Clemens Ladisch
2013-04-19 15:57 ` Alan Stern
[not found] <20130509001613.GA4383@richardiv.omgwallhack.org>
2013-05-09 14:38 ` [alsa-devel] " Alan Stern
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