From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: [PATCH] ALSA: firewire-lib/fireworks: fix miss detection of received MIDI messages Date: Fri, 28 Jun 2019 10:52:57 +0200 Message-ID: References: <20190628052158.27693-1-o-takashi@sakamocchi.jp> Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Return-path: In-Reply-To: <20190628052158.27693-1-o-takashi@sakamocchi.jp> Sender: stable-owner@vger.kernel.org To: Takashi Sakamoto Cc: clemens@ladisch.de, alsa-devel@alsa-project.org, stable@vger.kernel.org List-Id: alsa-devel@alsa-project.org On Fri, 28 Jun 2019 07:21:58 +0200, Takashi Sakamoto wrote: > > In IEC 61883-6, 8 MIDI data streams are multiplexed into single > MIDI conformant data channel. The index of stream is calculated by > modulo 8 of the value of data block counter. > > In fireworks, the value of data block counter in CIP header has a quirk > with firmware version v5.0.0, v5.7.3 and v5.8.0. This brings ALSA > IEC 61883-1/6 packet streaming engine to miss detection of MIDI > messages. > > This commit fixes the miss detection to modify the value of data block > counter for the modulo calculation. > > For maintainers, this bug exists since a commit 18f5ed365d3f ("ALSA: > fireworks/firewire-lib: add support for recent firmware quirk") in Linux > kernel v4.2. There're many changes since the commit. This fix can be > backported to Linux kernel v4.4 or later. I tagged a base commit to the > backport for your convenience. > > Fixes: df075feefbd3 ("ALSA: firewire-lib: complete AM824 data block processing layer") > Cc: # v4.4+ > Signed-off-by: Takashi Sakamoto This doesn't seem applicable to the latest 5.2-rc tree due to your recent refactoring. Could you resubmit the fix for 5.2? I'll resolve the merge conflict in my side. thanks, Takashi