From 8d1c2694e45bd5a1b7e79734952e8dfb6f2974a6 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Sun, 14 Jun 2015 12:49:36 +0900 Subject: [PATCH 20/21] ALSA: bebob: keep duplex streams always to keep internal multiplexer properly Behringer FCA610 transmits packets with periodic noisy PCM samples when receiving no streams, and generates a bit noisy sound. ALSA BeBoB driver is programmed to establish both in/out connections when starting streaming, then transfers packets as userspace applications requested. This means that there's a case that one of incoming/outgoing streams is running, to save CPU and bandwidth usage. Although, it's natural to start transferring packets in both direction. This commit makes this driver to keeps duplex streams always. Tested-by: Kim Tore Jensen Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/bebob/bebob.h | 3 +-- sound/firewire/bebob/bebob_midi.c | 8 ++++---- sound/firewire/bebob/bebob_pcm.c | 8 ++++---- sound/firewire/bebob/bebob_stream.c | 24 +++++++----------------- 4 files changed, 16 insertions(+), 27 deletions(-) diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index 1520854b76d7..d23caca7f369 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -97,8 +97,7 @@ struct snd_bebob { struct amdtp_stream rx_stream; struct cmp_connection out_conn; struct cmp_connection in_conn; - atomic_t capture_substreams; - atomic_t playback_substreams; + atomic_t substreams_counter; struct snd_bebob_stream_formation tx_stream_formations[SND_BEBOB_STRM_FMT_ENTRIES]; diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c index 63343d578df3..5681143925cd 100644 --- a/sound/firewire/bebob/bebob_midi.c +++ b/sound/firewire/bebob/bebob_midi.c @@ -17,7 +17,7 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream) if (err < 0) goto end; - atomic_inc(&bebob->capture_substreams); + atomic_inc(&bebob->substreams_counter); err = snd_bebob_stream_start_duplex(bebob, 0); if (err < 0) snd_bebob_stream_lock_release(bebob); @@ -34,7 +34,7 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream) if (err < 0) goto end; - atomic_inc(&bebob->playback_substreams); + atomic_inc(&bebob->substreams_counter); err = snd_bebob_stream_start_duplex(bebob, 0); if (err < 0) snd_bebob_stream_lock_release(bebob); @@ -46,7 +46,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream) { struct snd_bebob *bebob = substream->rmidi->private_data; - atomic_dec(&bebob->capture_substreams); + atomic_dec(&bebob->substreams_counter); snd_bebob_stream_stop_duplex(bebob); snd_bebob_stream_lock_release(bebob); @@ -57,7 +57,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream) { struct snd_bebob *bebob = substream->rmidi->private_data; - atomic_dec(&bebob->playback_substreams); + atomic_dec(&bebob->substreams_counter); snd_bebob_stream_stop_duplex(bebob); snd_bebob_stream_lock_release(bebob); diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c index e0a6b065952f..7a2c1f53bc44 100644 --- a/sound/firewire/bebob/bebob_pcm.c +++ b/sound/firewire/bebob/bebob_pcm.c @@ -213,7 +213,7 @@ pcm_capture_hw_params(struct snd_pcm_substream *substream, struct snd_bebob *bebob = substream->private_data; if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) - atomic_inc(&bebob->capture_substreams); + atomic_inc(&bebob->substreams_counter); amdtp_stream_set_pcm_format(&bebob->tx_stream, params_format(hw_params)); return snd_pcm_lib_alloc_vmalloc_buffer(substream, @@ -226,7 +226,7 @@ pcm_playback_hw_params(struct snd_pcm_substream *substream, struct snd_bebob *bebob = substream->private_data; if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) - atomic_inc(&bebob->playback_substreams); + atomic_inc(&bebob->substreams_counter); amdtp_stream_set_pcm_format(&bebob->rx_stream, params_format(hw_params)); return snd_pcm_lib_alloc_vmalloc_buffer(substream, @@ -239,7 +239,7 @@ pcm_capture_hw_free(struct snd_pcm_substream *substream) struct snd_bebob *bebob = substream->private_data; if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) - atomic_dec(&bebob->capture_substreams); + atomic_dec(&bebob->substreams_counter); snd_bebob_stream_stop_duplex(bebob); @@ -251,7 +251,7 @@ pcm_playback_hw_free(struct snd_pcm_substream *substream) struct snd_bebob *bebob = substream->private_data; if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) - atomic_dec(&bebob->playback_substreams); + atomic_dec(&bebob->substreams_counter); snd_bebob_stream_stop_duplex(bebob); diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c index d0df6c17f7f7..5be5242e1ed8 100644 --- a/sound/firewire/bebob/bebob_stream.c +++ b/sound/firewire/bebob/bebob_stream.c @@ -574,7 +574,6 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate) { struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate; struct amdtp_stream *master, *slave; - atomic_t *slave_substreams; enum cip_flags sync_mode; unsigned int curr_rate; bool updated = false; @@ -599,8 +598,7 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate) mutex_lock(&bebob->mutex); /* Need no substreams */ - if (atomic_read(&bebob->playback_substreams) == 0 && - atomic_read(&bebob->capture_substreams) == 0) + if (atomic_read(&bebob->substreams_counter) == 0) goto end; err = get_sync_mode(bebob, &sync_mode); @@ -609,11 +607,9 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate) if (sync_mode == CIP_SYNC_TO_DEVICE) { master = &bebob->tx_stream; slave = &bebob->rx_stream; - slave_substreams = &bebob->playback_substreams; } else { master = &bebob->rx_stream; slave = &bebob->tx_stream; - slave_substreams = &bebob->capture_substreams; } /* @@ -714,7 +710,7 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate) } /* start slave if needed */ - if (atomic_read(slave_substreams) > 0 && !amdtp_stream_running(slave)) { + if (!amdtp_stream_running(slave)) { err = start_stream(bebob, slave, rate); if (err < 0) { dev_err(&bebob->unit->device, @@ -740,31 +736,25 @@ end: void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob) { struct amdtp_stream *master, *slave; - atomic_t *master_substreams, *slave_substreams; if (bebob->master == &bebob->rx_stream) { slave = &bebob->tx_stream; master = &bebob->rx_stream; - slave_substreams = &bebob->capture_substreams; - master_substreams = &bebob->playback_substreams; } else { slave = &bebob->rx_stream; master = &bebob->tx_stream; - slave_substreams = &bebob->playback_substreams; - master_substreams = &bebob->capture_substreams; } mutex_lock(&bebob->mutex); - if (atomic_read(slave_substreams) == 0) { + if (atomic_read(&bebob->substreams_counter) == 0) { + amdtp_stream_pcm_abort(master); + amdtp_stream_stop(master); + amdtp_stream_pcm_abort(slave); amdtp_stream_stop(slave); - if (atomic_read(master_substreams) == 0) { - amdtp_stream_pcm_abort(master); - amdtp_stream_stop(master); - break_both_connections(bebob); - } + break_both_connections(bebob); } mutex_unlock(&bebob->mutex); -- 2.3.6