diff options
Diffstat (limited to 'sound/firewire')
| -rw-r--r-- | sound/firewire/amdtp-stream.c | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 6130c240ff33..1605ea4301ce 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -383,10 +383,9 @@ static unsigned int calculate_data_blocks(struct amdtp_stream *s, return data_blocks; } -static unsigned int calculate_syt(struct amdtp_stream *s, - unsigned int cycle) +static unsigned int calculate_syt_offset(struct amdtp_stream *s) { - unsigned int syt_offset, phase, index, syt; + unsigned int syt_offset, phase, index; if (s->ctx_data.rx.last_syt_offset < TICKS_PER_CYCLE) { if (!cip_sfc_is_base_44100(s->sfc)) @@ -416,15 +415,10 @@ static unsigned int calculate_syt(struct amdtp_stream *s, syt_offset = s->ctx_data.rx.last_syt_offset - TICKS_PER_CYCLE; s->ctx_data.rx.last_syt_offset = syt_offset; - if (syt_offset < TICKS_PER_CYCLE) { - syt_offset += s->ctx_data.rx.transfer_delay; - syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; - syt += syt_offset % TICKS_PER_CYCLE; + if (syt_offset >= TICKS_PER_CYCLE) + syt_offset = CIP_SYT_NO_INFO; - return syt & CIP_SYT_MASK; - } else { - return CIP_SYT_NO_INFO; - } + return syt_offset; } static void update_pcm_pointers(struct amdtp_stream *s, @@ -740,6 +734,17 @@ static int generate_device_pkt_descs(struct amdtp_stream *s, return 0; } +static unsigned int compute_syt(unsigned int syt_offset, unsigned int cycle, + unsigned int transfer_delay) +{ + unsigned int syt; + + syt_offset += transfer_delay; + syt = ((cycle + syt_offset / TICKS_PER_CYCLE) << 12) | + (syt_offset % TICKS_PER_CYCLE); + return syt & CIP_SYT_MASK; +} + static void generate_ideal_pkt_descs(struct amdtp_stream *s, struct pkt_desc *descs, const __be32 *ctx_header, @@ -751,9 +756,16 @@ static void generate_ideal_pkt_descs(struct amdtp_stream *s, for (i = 0; i < packets; ++i) { struct pkt_desc *desc = descs + i; unsigned int index = (s->packet_index + i) % s->queue_size; + unsigned int syt_offset; desc->cycle = compute_it_cycle(*ctx_header, s->queue_size); - desc->syt = calculate_syt(s, desc->cycle); + syt_offset = calculate_syt_offset(s); + if (syt_offset != CIP_SYT_NO_INFO) { + desc->syt = compute_syt(syt_offset, desc->cycle, + s->ctx_data.rx.transfer_delay); + } else { + desc->syt = syt_offset; + } desc->data_blocks = calculate_data_blocks(s, desc->syt); if (s->flags & CIP_DBC_IS_END_EVENT) |