path: root/sound/firewire
diff options
authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2019-07-01 23:43:53 +0900
committerTakashi Iwai <tiwai@suse.de>2019-07-01 16:59:02 +0200
commit7fbd1753b64eafe21cf842348a40a691d0dee440 (patch)
treecbde16bbd3741978beee0d4bd35e7c9fbdb8650c /sound/firewire
parentc3ea60c231446663afd6ea1054da6b7f830855ca (diff)
ALSA: firewire-lib/fireworks: fix miss detection of received MIDI messages
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. Besides, my work for Linux kernel v5.3 brings heavy code refactoring and some structure members are renamed in 'sound/firewire/amdtp-stream.h'. The content of this patch brings conflict when merging -rc tree with this patch and the latest tree. I request maintainers to solve the conflict to replace 'tx_first_dbc' with 'ctx_data.tx.first_dbc'. Fixes: df075feefbd3 ("ALSA: firewire-lib: complete AM824 data block processing layer") Cc: <stable@vger.kernel.org> # v4.4+ Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire')
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/firewire/amdtp-am824.c b/sound/firewire/amdtp-am824.c
index 4210e5c6262e..d09da9dbf235 100644
--- a/sound/firewire/amdtp-am824.c
+++ b/sound/firewire/amdtp-am824.c
@@ -321,7 +321,7 @@ static void read_midi_messages(struct amdtp_stream *s,
u8 *b;
for (f = 0; f < frames; f++) {
- port = (s->data_block_counter + f) % 8;
+ port = (8 - s->tx_first_dbc + s->data_block_counter + f) % 8;
b = (u8 *)&buffer[p->midi_position];
len = b[0] - 0x80;