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ALSA: firewire-lib: code refactoring for generation of syt sequence

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This commit dissolves sequence generator in terms of syt offsets for
packet.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210522013303.49596-5-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2021-05-22 10:33:01 +09:00 committed by Takashi Iwai
parent 7ca7cddab2
commit c79b7158b0
1 changed files with 24 additions and 2 deletions
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26
sound/firewire/amdtp-stream.c
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@ -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);