@@ -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);
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(-)