Below devices reports zero as the number of channels for external output
plug with MIDI type:
* Yamaha GO44/GO46
* Terratec Phase 24/X24
As a result, rx packet format is invalid and they generate silent sound.
This is a regression added in v5.13.
This commit fixes the bug, addressed at a commit 1bd1b3be8655 ("ALSA:
bebob: perform sequence replay for media clock recovery").
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 5c6ea94f2b7c ("ALSA: bebob: detect the number of available MIDI ports")
Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
sound/firewire/bebob/bebob_stream.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index e3e23e42add3..8629b14ded76 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -856,6 +856,11 @@ static int detect_midi_ports(struct snd_bebob *bebob,
err = avc_bridgeco_get_plug_ch_count(bebob->unit, addr, &ch_count);
if (err < 0)
break;
+ // Yamaha GO44, GO46, Terratec Phase 24, Phase x24 reports 0 for the number of
+ // channels in external output plug 3 (MIDI type) even if it has a pair of physical
+ // MIDI jacks. As a workaround, assume it as one.
+ if (ch_count == 0)
+ ch_count = 1;
*midi_ports += ch_count;
}
@@ -934,12 +939,12 @@ int snd_bebob_stream_discover(struct snd_bebob *bebob)
if (err < 0)
goto end;
- err = detect_midi_ports(bebob, bebob->rx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_IN,
+ err = detect_midi_ports(bebob, bebob->tx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_IN,
plugs[2], &bebob->midi_input_ports);
if (err < 0)
goto end;
- err = detect_midi_ports(bebob, bebob->tx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_OUT,
+ err = detect_midi_ports(bebob, bebob->rx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_OUT,
plugs[3], &bebob->midi_output_ports);
if (err < 0)
goto end;
--
2.30.2
