diff options
Diffstat (limited to 'sound/firewire/tascam/amdtp-tascam.c')
| -rw-r--r-- | sound/firewire/tascam/amdtp-tascam.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/sound/firewire/tascam/amdtp-tascam.c b/sound/firewire/tascam/amdtp-tascam.c index 516cb931fd5e..0e8088c9ada9 100644 --- a/sound/firewire/tascam/amdtp-tascam.c +++ b/sound/firewire/tascam/amdtp-tascam.c @@ -121,13 +121,45 @@ static void read_status_messages(struct amdtp_stream *s, __be32 *buffer, unsigned int data_blocks) { struct snd_tscm *tscm = container_of(s, struct snd_tscm, tx_stream); + bool used = READ_ONCE(tscm->hwdep->used); int i; for (i = 0; i < data_blocks; i++) { unsigned int index; + __be32 before; + __be32 after; index = be32_to_cpu(buffer[0]) % SNDRV_FIREWIRE_TASCAM_STATE_COUNT; - tscm->state[index] = buffer[s->data_block_quadlets - 1]; + before = tscm->state[index]; + after = buffer[s->data_block_quadlets - 1]; + + if (used && index > 4 && index < 16) { + __be32 mask; + + if (index == 5) + mask = cpu_to_be32(~0x0000ffff); + else if (index == 6) + mask = cpu_to_be32(~0x0000ffff); + else if (index == 8) + mask = cpu_to_be32(~0x000f0f00); + else + mask = cpu_to_be32(~0x00000000); + + if ((before ^ after) & mask) { + struct snd_firewire_tascam_change *entry = + &tscm->queue[tscm->push_pos]; + + spin_lock_irq(&tscm->lock); + entry->index = index; + entry->before = before; + entry->after = after; + if (++tscm->push_pos >= SND_TSCM_QUEUE_COUNT) + tscm->push_pos = 0; + spin_unlock_irq(&tscm->lock); + } + } + + tscm->state[index] = after; buffer += s->data_block_quadlets; } } |