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ALSA: firewire-lib: code refactoring for calculation of context payload

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It's convenient to calculate the size of context payload apart from
the size of isochronous packet payload.

This commit adds a helper function for it.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210520040154.80450-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2021-05-20 13:01:48 +09:00 committed by Takashi Iwai
parent 67d92ee7a5
commit c75f36789d
1 changed files with 21 additions and 16 deletions
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37
sound/firewire/amdtp-stream.c
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@ -313,6 +313,19 @@ int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate,
}
EXPORT_SYMBOL(amdtp_stream_set_parameters);
// The CIP header is processed in context header apart from context payload.
static int amdtp_stream_get_max_ctx_payload_size(struct amdtp_stream *s)
{
unsigned int multiplier;
if (s->flags & CIP_JUMBO_PAYLOAD)
multiplier = IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES;
else
multiplier = 1;
return s->syt_interval * s->data_block_quadlets * sizeof(__be32) * multiplier;
}
/**
* amdtp_stream_get_max_payload - get the stream's packet size
* @s: the AMDTP stream
@ -322,16 +335,14 @@ EXPORT_SYMBOL(amdtp_stream_set_parameters);
*/
unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s)
{
unsigned int multiplier = 1;
unsigned int cip_header_size = 0;
unsigned int cip_header_size;
if (s->flags & CIP_JUMBO_PAYLOAD)
multiplier = IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES;
if (!(s->flags & CIP_NO_HEADER))
cip_header_size = CIP_HEADER_SIZE;
else
cip_header_size = 0;
return cip_header_size +
s->syt_interval * s->data_block_quadlets * sizeof(__be32) * multiplier;
return cip_header_size + amdtp_stream_get_max_ctx_payload_size(s);
}
EXPORT_SYMBOL(amdtp_stream_get_max_payload);
@ -1140,27 +1151,21 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
}
// initialize packet buffer.
max_ctx_payload_size = amdtp_stream_get_max_payload(s);
if (s->direction == AMDTP_IN_STREAM) {
dir = DMA_FROM_DEVICE;
type = FW_ISO_CONTEXT_RECEIVE;
if (!(s->flags & CIP_NO_HEADER)) {
max_ctx_payload_size -= CIP_HEADER_SIZE;
if (!(s->flags & CIP_NO_HEADER))
ctx_header_size = IR_CTX_HEADER_SIZE_CIP;
} else {
else
ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP;
}
} else {
dir = DMA_TO_DEVICE;
type = FW_ISO_CONTEXT_TRANSMIT;
ctx_header_size = 0; // No effect for IT context.
if (!(s->flags & CIP_NO_HEADER))
max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP;
}
max_ctx_payload_size = amdtp_stream_get_max_ctx_payload_size(s);
err = iso_packets_buffer_init(&s->buffer, s->unit, queue_size,
max_ctx_payload_size, dir);
err = iso_packets_buffer_init(&s->buffer, s->unit, queue_size, max_ctx_payload_size, dir);
if (err < 0)
goto err_unlock;
s->queue_size = queue_size;