diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2016-02-20 16:18:59 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2016-02-20 15:45:54 +0100 |
| commit | 3800e6f944e929ddfcd9320a51e13a67fd1956ff (patch) | |
| tree | efa6c1a547d090d2a2477a91ef7b28aa848f434b | |
| parent | 4fd6c6c7295a50aa9390a3131623456e0c05d8f9 (diff) | |
ALSA: bebob: give up updating streams at bus reset handler
DM1000/DM1100/DM1500 chipsets transfer packets with discontinue value in
'dbc' field of CIP header. For ALSA bebob driver, this makes its bus-reset
handler meaningless, because the discontinuity is detected quite earlier
than executing the handler.
This commit gives up updating streams at the bus reset handler.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/firewire/bebob/bebob.c | 20 | ||||
| -rw-r--r-- | sound/firewire/bebob/bebob.h | 1 | ||||
| -rw-r--r-- | sound/firewire/bebob/bebob_stream.c | 15 |
3 files changed, 16 insertions, 20 deletions
diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c index 671179eaff1e..3e4e0756e3fe 100644 --- a/sound/firewire/bebob/bebob.c +++ b/sound/firewire/bebob/bebob.c @@ -300,6 +300,22 @@ error: return err; } +/* + * This driver doesn't update streams in bus reset handler. + * + * DM1000/ DM1100/DM1500 chipsets with BeBoB firmware transfer packets with + * discontinued counter at bus reset. This discontinuity is immediately + * detected in packet streaming layer, then it sets XRUN to PCM substream. + * + * ALSA PCM applications can know the XRUN by getting -EPIPE from PCM operation. + * Then, they can recover the PCM substream by executing ioctl(2) with + * SNDRV_PCM_IOCTL_PREPARE. 'struct snd_pcm_ops.prepare' is called and drivers + * restart packet streaming. + * + * The above processing may be executed before this bus-reset handler is + * executed. When this handler updates streams with current isochronous + * channels, the streams already have the current ones. + */ static void bebob_update(struct fw_unit *unit) { @@ -310,10 +326,6 @@ bebob_update(struct fw_unit *unit) fcp_bus_reset(bebob->unit); - mutex_lock(&bebob->mutex); - snd_bebob_stream_update_duplex(bebob); - mutex_unlock(&bebob->mutex); - if (bebob->deferred_registration) { if (snd_card_register(bebob->card) < 0) { snd_bebob_stream_destroy_duplex(bebob); diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index 4fe58e422133..b50bb33d9d46 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -217,7 +217,6 @@ int snd_bebob_stream_discover(struct snd_bebob *bebob); int snd_bebob_stream_init_duplex(struct snd_bebob *bebob); int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate); void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob); -void snd_bebob_stream_update_duplex(struct snd_bebob *bebob); void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob); void snd_bebob_stream_lock_changed(struct snd_bebob *bebob); diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c index 8c687456a0e6..77cbb02bff34 100644 --- a/sound/firewire/bebob/bebob_stream.c +++ b/sound/firewire/bebob/bebob_stream.c @@ -746,21 +746,6 @@ void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob) } } -void snd_bebob_stream_update_duplex(struct snd_bebob *bebob) -{ - if ((cmp_connection_update(&bebob->in_conn) < 0) || - (cmp_connection_update(&bebob->out_conn) < 0)) { - amdtp_stream_pcm_abort(&bebob->rx_stream); - amdtp_stream_pcm_abort(&bebob->tx_stream); - amdtp_stream_stop(&bebob->rx_stream); - amdtp_stream_stop(&bebob->tx_stream); - break_both_connections(bebob); - } else { - amdtp_stream_update(&bebob->rx_stream); - amdtp_stream_update(&bebob->tx_stream); - } -} - /* * This function should be called before starting streams or after stopping * streams. |