From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <5176A42F.6080409@ladisch.de> Date: Tue, 23 Apr 2013 17:09:35 +0200 From: Clemens Ladisch MIME-Version: 1.0 References: In-Reply-To: Subject: Re: [alsa-devel] BUG: USB audio discontinuities with 'UHCI: implement new semantics for URB_ISO_ASAP' List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org Cc: tova-dev@tovacompany.com, linux-usb@vger.kernel.org, Joe Rayhawk , alsa-devel@vger.kernel.org List-ID: 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 -- To unsubscribe from this list: send the line "unsubscribe alsa-devel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel