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ALSA: fireworks/firewire-lib: Add a quirk for empty packet with TAG0

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Fireworks has a quirk to transmit empty packets with TAG0. This commit
adds handling this quirk for full duplex stream synchronization.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2014-04-25 22:45:03 +09:00 committed by Takashi Iwai
parent 315fd41fe9
commit 7ab566453f
3 changed files with 10 additions and 3 deletions
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9
sound/firewire/amdtp.c
View File

@ -815,7 +815,7 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
};
unsigned int header_size;
enum dma_data_direction dir;
int type, err;
int type, tag, err;
mutex_lock(&s->mutex);
@ -869,9 +869,12 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
} while (s->packet_index > 0);
/* NOTE: TAG1 matches CIP. This just affects in stream. */
tag = FW_ISO_CONTEXT_MATCH_TAG1;
if (s->flags & CIP_EMPTY_WITH_TAG0)
tag |= FW_ISO_CONTEXT_MATCH_TAG0;
s->callbacked = false;
err = fw_iso_context_start(s->context, -1, 0,
FW_ISO_CONTEXT_MATCH_TAG1);
err = fw_iso_context_start(s->context, -1, 0, tag);
if (err < 0)
goto err_context;

2
sound/firewire/amdtp.h
View File

@ -18,11 +18,13 @@
* the overall sample rate comes out right.
* @CIP_SYNC_TO_DEVICE: In sync to device mode, time stamp in out packets is
* generated by in packets. Defaultly this driver generates timestamp.
* @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
*/
enum cip_flags {
CIP_NONBLOCKING = 0x00,
CIP_BLOCKING = 0x01,
CIP_SYNC_TO_DEVICE = 0x02,
CIP_EMPTY_WITH_TAG0 = 0x04,
};
/**

2
sound/firewire/fireworks/fireworks_stream.c
View File

@ -194,6 +194,8 @@ int snd_efw_stream_init_duplex(struct snd_efw *efw)
err = init_stream(efw, &efw->tx_stream);
if (err < 0)
goto end;
/* Fireworks transmits NODATA packets with TAG0. */
efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
err = init_stream(efw, &efw->rx_stream);
if (err < 0) {