This commit dissolves sequence generator in terms of syt offsets for packet.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/amdtp-stream.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 354512a350b7..77ae75e79a43 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -441,8 +441,30 @@ static unsigned int calculate_syt_offset(unsigned int *last_syt_offset, return syt_offset; }
+static void pool_ideal_syt_offsets(struct amdtp_stream *s, struct seq_desc *descs, + const unsigned int seq_size, unsigned int seq_tail, + unsigned int count) +{ + const enum cip_sfc sfc = s->sfc; + unsigned int last = s->ctx_data.rx.last_syt_offset; + unsigned int state = s->ctx_data.rx.syt_offset_state; + int i; + + for (i = 0; i < count; ++i) { + struct seq_desc *desc = descs + seq_tail; + + desc->syt_offset = calculate_syt_offset(&last, &state, sfc); + + seq_tail = (seq_tail + 1) % seq_size; + } + + s->ctx_data.rx.last_syt_offset = last; + s->ctx_data.rx.syt_offset_state = state; +} + static void pool_ideal_seq_descs(struct amdtp_stream *s, unsigned int count) { + struct seq_desc *descs = s->ctx_data.rx.seq.descs; unsigned int seq_tail = s->ctx_data.rx.seq.tail; const unsigned int seq_size = s->ctx_data.rx.seq.size; const unsigned int syt_interval = s->syt_interval; @@ -450,11 +472,11 @@ static void pool_ideal_seq_descs(struct amdtp_stream *s, unsigned int count) const bool is_blocking = !!(s->flags & CIP_BLOCKING); int i;
+ pool_ideal_syt_offsets(s, descs, seq_size, seq_tail, count); + for (i = 0; i < count; ++i) { struct seq_desc *desc = s->ctx_data.rx.seq.descs + seq_tail;
- desc->syt_offset = calculate_syt_offset(&s->ctx_data.rx.last_syt_offset, - &s->ctx_data.rx.syt_offset_state, sfc); desc->data_blocks = calculate_data_blocks(&s->ctx_data.rx.data_block_state, is_blocking, desc->syt_offset == CIP_SYT_NO_INFO, syt_interval, sfc);