@@ -256,7 +256,9 @@ static unsigned int calculate_data_blocks(struct amdtp_stream *s)
{
unsigned int phase, data_blocks;
- if (!cip_sfc_is_base_44100(s->sfc)) {
+ if (s->flags & CIP_BLOCKING)
+ data_blocks = s->syt_interval;
+ else if (!cip_sfc_is_base_44100(s->sfc)) {
/* Sample_rate / 8000 is an integer, and precomputed. */
data_blocks = s->data_block_state;
} else {
@@ -620,26 +622,22 @@ static inline int queue_in_packet(struct amdtp_stream *s)
amdtp_stream_get_max_payload(s), false);
}
-static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle)
+static void handle_out_packet(struct amdtp_stream *s, unsigned int syt)
{
__be32 *buffer;
- unsigned int index, data_blocks, syt, payload_length;
+ unsigned int data_blocks, payload_length;
struct snd_pcm_substream *pcm;
if (s->packet_index < 0)
return;
- index = s->packet_index;
/* this module generate empty packet for 'no data' */
- syt = calculate_syt(s, cycle);
- if (!(s->flags & CIP_BLOCKING))
+ if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO))
data_blocks = calculate_data_blocks(s);
- else if (syt != CIP_SYT_NO_INFO)
- data_blocks = s->syt_interval;
else
data_blocks = 0;
- buffer = s->buffer.packets[index].buffer;
+ buffer = s->buffer.packets[s->packet_index].buffer;
buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
(s->data_block_quadlets << AMDTP_DBS_SHIFT) |
s->data_block_counter);
@@ -737,7 +735,7 @@ static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
void *private_data)
{
struct amdtp_stream *s = private_data;
- unsigned int i, packets = header_length / 4;
+ unsigned int i, syt, packets = header_length / 4;
/*
* Compute the cycle of the last queued packet.
@@ -746,8 +744,10 @@ static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
*/
cycle += QUEUE_LENGTH - packets;
- for (i = 0; i < packets; ++i)
- handle_out_packet(s, ++cycle);
+ for (i = 0; i < packets; ++i) {
+ syt = calculate_syt(s, ++cycle);
+ handle_out_packet(s, syt);
+ }
fw_iso_context_queue_flush(s->context);
}
For duplex streams with synchronization, drivers should pick up 'presentation timestamp' from in-packets and use the timestamp for out-packets. This commit is preparation for this. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- sound/firewire/amdtp.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)