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authorClemens Ladisch <clemens@ladisch.de>2014-11-25 22:52:24 +0100
committerTakashi Iwai <tiwai@suse.de>2015-01-16 22:50:45 +0100
commit5c697e5b46efea2c0a5da55208bc71db46698fd1 (patch)
tree65264f081f2dc54c44214a5e163be5ddaa18c7e9
parent92cb46584e104e2f4b14a44959109ffe13524a26 (diff)
downloadkernel-5c697e5b46efea2c0a5da55208bc71db46698fd1.tar.gz
ALSA: firewire-lib: remove rx_blocks_for_midi quirk
There are several devices that expect to receive MIDI data only in the first eight data blocks of a packet. If the driver restricts the data rate to the allowed rate (as mandated by the specification, but not yet implemented by this driver), this happens naturally. Therefore, there is no reason to ever try to use more data packets with any device. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Tested-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/firewire/amdtp.c12
-rw-r--r--sound/firewire/amdtp.h3
-rw-r--r--sound/firewire/bebob/bebob_stream.c7
-rw-r--r--sound/firewire/fireworks/fireworks_stream.c5
4 files changed, 8 insertions, 19 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 3badc70124ab..ef399cadb8a5 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -21,7 +21,13 @@
#define CYCLES_PER_SECOND 8000
#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND)
-#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */
+/*
+ * Several devices look only at the first eight data blocks.
+ * In any case, this is more than enough for the MIDI data rate.
+ */
+#define MAX_MIDI_RX_BLOCKS 8
+
+#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */
/* isochronous header parameters */
#define ISO_DATA_LENGTH_SHIFT 16
@@ -78,8 +84,6 @@ 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);
@@ -474,7 +478,7 @@ static void amdtp_fill_midi(struct amdtp_stream *s,
b = (u8 *)&buffer[s->midi_position];
port = (s->data_block_counter + f) % 8;
- if ((f >= s->rx_blocks_for_midi) ||
+ if ((f >= MAX_MIDI_RX_BLOCKS) ||
(s->midi[port] == NULL) ||
(snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0))
b[0] = 0x80;
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index e6e8926275b0..cd4c4dfb3951 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -152,9 +152,6 @@ 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/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index 1aab0a32870c..0ebcabfdc7ce 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -484,13 +484,6 @@ int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
amdtp_stream_destroy(&bebob->rx_stream);
destroy_both_connections(bebob);
}
- /*
- * The firmware for these devices ignore MIDI messages in more than
- * first 8 data blocks of an received AMDTP packet.
- */
- if (bebob->spec == &maudio_fw410_spec ||
- bebob->spec == &maudio_special_spec)
- bebob->rx_stream.rx_blocks_for_midi = 8;
end:
return err;
}
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index b985fc5ebdc6..4f440e163667 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -179,11 +179,6 @@ 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);