ALSA: fireworks/firewire-lib: Add a quirk of data blocks for MIDI in out-stream

Fireworks has a quirk to ignore MIDI messages in data blocks more than 8.
This commit adds a flag for this quirk and codes to skip 8 or more data
blocks to transfer MIDI messages.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 12 insertions, 1 deletions

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 5e13b3f15516..28ee3d86164d 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -78,6 +78,8 @@ int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
         s->callbacked = false;
         s->sync_slave = NULL;
 
+        s->rx_blocks_for_midi = UINT_MAX;
+
         return 0;
 }
 EXPORT_SYMBOL(amdtp_stream_init);
@@ -472,7 +474,8 @@ static void amdtp_fill_midi(struct amdtp_stream *s,
                 b = (u8 *)&buffer[s->midi_position];
 
                 port = (s->data_block_counter + f) % 8;
-                if ((s->midi[port] == NULL) ||
+                if ((f >= s->rx_blocks_for_midi) ||
+                    (s->midi[port] == NULL) ||
                     (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0))
                         b[0] = 0x80;
                 else
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index 42c75c916684..fb5934cc01aa 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -125,6 +125,9 @@ struct amdtp_stream {
         /* quirk: fixed interval of dbc between previos/current packets. */
         unsigned int tx_dbc_interval;
 
+        /* quirk: the first count of data blocks in an rx packet for MIDI */
+        unsigned int rx_blocks_for_midi;
+
         bool callbacked;
         wait_queue_head_t callback_wait;
         struct amdtp_stream *sync_slave;
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index 3a3f203177b1..f9d836fc5039 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -212,6 +212,11 @@ int snd_efw_stream_init_duplex(struct snd_efw *efw)
                 destroy_stream(efw, &efw->tx_stream);
                 goto end;
         }
+        /*
+         * Fireworks ignores MIDI messages in more than first 8 data
+         * blocks of an received AMDTP packet.
+         */
+        efw->rx_stream.rx_blocks_for_midi = 8;
 
         /* set IEC61883 compliant mode (actually not fully compliant...) */
         err = snd_efw_command_set_tx_mode(efw, SND_EFW_TRANSPORT_MODE_IEC61883);