From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Sakamoto Subject: Re: [PATCH 52/52] bebob: Add support for M-Audio special Firewire series Date: Tue, 25 Feb 2014 23:02:37 +0900 Message-ID: <530CA27D.2000306@sakamocchi.jp> References: <1391003099-7109-1-git-send-email-o-takashi@sakamocchi.jp> <1391006977-11572-3-git-send-email-o-takashi@sakamocchi.jp> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1391006977-11572-3-git-send-email-o-takashi@sakamocchi.jp> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux1394-devel-bounces@lists.sourceforge.net To: clemens@ladisch.de Cc: alsa-devel@alsa-project.org, linux1394-devel@lists.sourceforge.net, ffado-devel@lists.sf.net List-Id: alsa-devel@alsa-project.org Hi Clemens, Can I request your comment for this patch about a quirk of transaction? [alsa-devel] [PATCH 52/52] bebob: Add support for M-Audio special Firewire series http://mailman.alsa-project.org/pipermail/alsa-devel/2014-January/071873.html Let me describe more detail here. M-Audio Firewire 1814 and ProjectMix I/O often send no response against driver's request, even if the device handle the request. Please see logs in this page: http://subversion.ffado.org/wiki/MaudioBebob/Firewire1814#Logswithfirewire_ohcianddebug1option For CMP and Isochronous Resource Management, this quirk works badly. When a request from driver is handled by the device but the device don't respond, the drivers (firewire_core/snd-firewire-lib) retry the request. Then a response for the second request brings error because the operation for connection or isochronous resource management is already done in device side. Against this quirk, I want to merge this patch for upstream, because there is no drivers for these devices in kernel-land/user-lang. And this quirk makes no disorders into Linux Firewire stack or ALSA core. When users face these failure, users can recover device state just powering off and on. Regards Takashi Sakamoto o-takashi@sakamocchi.jp ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk