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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2016-05-09 23:15:52 +0900
committerTakashi Iwai <tiwai@suse.de>2016-05-10 17:03:59 +0200
commit28e64f5176387bf5b9458d213650b90fa719be88 (patch)
tree8e6b9626ee886775fc0dd7a98c7d6cb8662226ce /sound/firewire
parenteb4a378fc99d876e98e01d67701c49343fae3e39 (diff)
downloadop-kernel-dev-28e64f5176387bf5b9458d213650b90fa719be88.zip
op-kernel-dev-28e64f5176387bf5b9458d213650b90fa719be88.tar.gz
ALSA: firewire-tascam: drop reuse of incoming packet parameter for outgoing packet parameter
In packet streaming protocol applied to TASCAM FireWire series, the value of SYT field in CIP header is always zero, therefore it has no meaning. There's no need to synchronize packets in both direction for the series. In current implementation of ALSA firewire stack, driver for the series uses incoming packet parameter for outgoing packet parameter to calculate the number of data blocks. This can be simplified because the task of corresponding driver is to transfer data blocks enough to sampling transfer frequency. This commit purges support of full duplex synchronization to prevent over-engineering implementation. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/tascam/tascam-stream.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c
index 0e6dd5c6..4ad3bd7 100644
--- a/sound/firewire/tascam/tascam-stream.c
+++ b/sound/firewire/tascam/tascam-stream.c
@@ -381,19 +381,17 @@ int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
if (err < 0)
return err;
if (curr_rate != rate ||
- amdtp_streaming_error(&tscm->tx_stream) ||
- amdtp_streaming_error(&tscm->rx_stream)) {
+ amdtp_streaming_error(&tscm->rx_stream) ||
+ amdtp_streaming_error(&tscm->tx_stream)) {
finish_session(tscm);
- amdtp_stream_stop(&tscm->tx_stream);
amdtp_stream_stop(&tscm->rx_stream);
+ amdtp_stream_stop(&tscm->tx_stream);
release_resources(tscm);
}
- if (!amdtp_stream_running(&tscm->tx_stream)) {
- amdtp_stream_set_sync(CIP_SYNC_TO_DEVICE,
- &tscm->tx_stream, &tscm->rx_stream);
+ if (!amdtp_stream_running(&tscm->rx_stream)) {
err = keep_resources(tscm, rate);
if (err < 0)
goto error;
@@ -406,27 +404,27 @@ int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
if (err < 0)
goto error;
- err = amdtp_stream_start(&tscm->tx_stream,
- tscm->tx_resources.channel,
+ err = amdtp_stream_start(&tscm->rx_stream,
+ tscm->rx_resources.channel,
fw_parent_device(tscm->unit)->max_speed);
if (err < 0)
goto error;
- if (!amdtp_stream_wait_callback(&tscm->tx_stream,
+ if (!amdtp_stream_wait_callback(&tscm->rx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
}
}
- if (!amdtp_stream_running(&tscm->rx_stream)) {
- err = amdtp_stream_start(&tscm->rx_stream,
- tscm->rx_resources.channel,
+ if (!amdtp_stream_running(&tscm->tx_stream)) {
+ err = amdtp_stream_start(&tscm->tx_stream,
+ tscm->tx_resources.channel,
fw_parent_device(tscm->unit)->max_speed);
if (err < 0)
goto error;
- if (!amdtp_stream_wait_callback(&tscm->rx_stream,
+ if (!amdtp_stream_wait_callback(&tscm->tx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
@@ -435,8 +433,8 @@ int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
return 0;
error:
- amdtp_stream_stop(&tscm->tx_stream);
amdtp_stream_stop(&tscm->rx_stream);
+ amdtp_stream_stop(&tscm->tx_stream);
finish_session(tscm);
release_resources(tscm);
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