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ALSA: firewire-lib: unify packet handler for IR context

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Usage of 16 bytes IR context header allows to handle context payload by
the same code for with-CIP and without-CIP packets.

This commit unifies both handlers of with-CIP and without-CIP packets.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-05-22 23:17:08 +09:00 committed by Takashi Iwai
parent f11453c7cc
commit 947b437e12
1 changed files with 15 additions and 39 deletions
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54
sound/firewire/amdtp-stream.c
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@ -676,13 +676,20 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
}
cip_header = ctx_header + 2;
err = check_cip_header(s, cip_header, payload_length, &data_blocks,
&syt);
if (err < 0) {
if (err != -EAGAIN)
return err;
pcm_frames = 0;
goto end;
if (!(s->flags & CIP_NO_HEADER)) {
cip_header = &ctx_header[2];
err = check_cip_header(s, cip_header, payload_length,
&data_blocks, &syt);
if (err < 0) {
if (err != -EAGAIN)
return err;
pcm_frames = 0;
goto end;
}
} else {
cip_header = NULL;
data_blocks = payload_length / 4 / s->data_block_quadlets;
syt = 0;
}
trace_amdtp_packet(s, cycle, cip_header, payload_length, data_blocks,
@ -700,33 +707,6 @@ end:
return 0;
}
static int handle_in_packet_without_header(struct amdtp_stream *s,
unsigned int cycle, const __be32 *ctx_header,
__be32 *buffer, unsigned int index)
{
unsigned int payload_length;
unsigned int data_blocks;
struct snd_pcm_substream *pcm;
unsigned int pcm_frames;
payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT;
data_blocks = payload_length / 4 / s->data_block_quadlets;
trace_amdtp_packet(s, cycle, NULL, payload_length, data_blocks, index);
pcm_frames = s->process_data_blocks(s, buffer, data_blocks, NULL);
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
if (queue_in_packet(s) < 0)
return -EIO;
pcm = READ_ONCE(s->pcm);
if (pcm && pcm_frames > 0)
update_pcm_pointers(s, pcm, pcm_frames);
return 0;
}
// In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On
// the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent
// it. Thus, via Linux firewire subsystem, we can get the 3 bits for second.
@ -812,7 +792,7 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
cycle = compute_cycle_count(ctx_header[1]);
buffer = s->buffer.packets[s->packet_index].buffer;
if (s->handle_packet(s, cycle, ctx_header, buffer, i) < 0)
if (handle_in_packet(s, cycle, ctx_header, buffer, i) < 0)
break;
ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header);
@ -847,10 +827,6 @@ static void amdtp_stream_first_callback(struct fw_iso_context *context,
cycle = compute_cycle_count(ctx_header[1]);
context->callback.sc = in_stream_callback;
if (s->flags & CIP_NO_HEADER)
s->handle_packet = handle_in_packet_without_header;
else
s->handle_packet = handle_in_packet;
} else {
cycle = compute_it_cycle(*ctx_header);