diff options
| -rw-r--r-- | sound/firewire/amdtp.c | 15 | ||||
| -rw-r--r-- | sound/firewire/amdtp.h | 3 | ||||
| -rw-r--r-- | sound/firewire/fireworks/fireworks_stream.c | 2 |
3 files changed, 18 insertions, 2 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c index dce4c6dd3f6d..51aad680886d 100644 --- a/sound/firewire/amdtp.c +++ b/sound/firewire/amdtp.c @@ -620,6 +620,7 @@ static void handle_in_packet(struct amdtp_stream *s, u32 cip_header[2]; unsigned int data_blocks, data_block_quadlets, data_block_counter; struct snd_pcm_substream *pcm = NULL; + bool lost; cip_header[0] = be32_to_cpu(buffer[0]); cip_header[1] = be32_to_cpu(buffer[1]); @@ -658,7 +659,13 @@ static void handle_in_packet(struct amdtp_stream *s, /* Check data block counter continuity */ data_block_counter = cip_header[0] & AMDTP_DBC_MASK; - if (data_block_counter != s->data_block_counter) { + if (!(s->flags & CIP_DBC_IS_END_EVENT)) + lost = data_block_counter != s->data_block_counter; + else + lost = data_block_counter != + ((s->data_block_counter + data_blocks) & 0xff); + + if (lost) { dev_info(&s->unit->device, "Detect discontinuity of CIP: %02X %02X\n", s->data_block_counter, data_block_counter); @@ -676,7 +683,11 @@ static void handle_in_packet(struct amdtp_stream *s, amdtp_pull_midi(s, buffer, data_blocks); } - s->data_block_counter = (data_block_counter + data_blocks) & 0xff; + if (s->flags & CIP_DBC_IS_END_EVENT) + s->data_block_counter = data_block_counter; + else + s->data_block_counter = + (data_block_counter + data_blocks) & 0xff; end: if (queue_in_packet(s) < 0) goto err; diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h index 96b96ec812b2..1ca1a193bbc0 100644 --- a/sound/firewire/amdtp.h +++ b/sound/firewire/amdtp.h @@ -19,12 +19,15 @@ * @CIP_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is * generated by in packets. Defaultly this driver generates timestamp. * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0. + * @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet + * corresponds to the end of event in the packet. Out of IEC 61883. */ enum cip_flags { CIP_NONBLOCKING = 0x00, CIP_BLOCKING = 0x01, CIP_SYNC_TO_DEVICE = 0x02, CIP_EMPTY_WITH_TAG0 = 0x04, + CIP_DBC_IS_END_EVENT = 0x08, }; /** diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c index 360e871bf838..d687b047446b 100644 --- a/sound/firewire/fireworks/fireworks_stream.c +++ b/sound/firewire/fireworks/fireworks_stream.c @@ -196,6 +196,8 @@ int snd_efw_stream_init_duplex(struct snd_efw *efw) goto end; /* Fireworks transmits NODATA packets with TAG0. */ efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0; + /* Fireworks has its own meaning for dbc. */ + efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT; err = init_stream(efw, &efw->rx_stream); if (err < 0) { |