summaryrefslogtreecommitdiff
path: root/sound/firewire
diff options
context:
space:
mode:
authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2016-02-20 10:18:59 +0300
committerTakashi Iwai <tiwai@suse.de>2016-02-20 17:45:54 +0300
commit3800e6f944e929ddfcd9320a51e13a67fd1956ff (patch)
treeefa6c1a547d090d2a2477a91ef7b28aa848f434b /sound/firewire
parent4fd6c6c7295a50aa9390a3131623456e0c05d8f9 (diff)
downloadlinux-3800e6f944e929ddfcd9320a51e13a67fd1956ff.tar.xz
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>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/bebob/bebob.c20
-rw-r--r--sound/firewire/bebob/bebob.h1
-rw-r--r--sound/firewire/bebob/bebob_stream.c15
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.