[alsa-devel] [PATCH 00/12] ALSA: firewire: configure interval of hw IRQ via ALSA PCM interface

[alsa-devel] [PATCH 00/12] ALSA: firewire: configure interval of hw IRQ via ALSA PCM interface

[Takashi Sakamoto]

Hi,

ALSA IEC 61883-1/6 packet streaming engine controls OHCI 1394 controller
to generate hardware IRQ for fixed number (=16) of isoc packets.
Additionally, the size of packet buffer is fixed for triple of interval
of hardware IRQ (=48).

This commit allows ALSA PCM applications to configure these parameters
by ALSA PCM interface. As a result, the size of PCM period is available
in the range between 125 usec and 64 msec (or 32 msec). The hardware
IRQ is scheduled for isoc packet which includes event across PCM period
boundary.

Takashi Sakamoto (12):
  ALSA: firewire-lib: use variable size of queue for isoc packets
    instead of fixed size
  ALSA: bebob: share PCM buffer size for both direction
  ALSA: fireworks: share PCM buffer size for both direction
  ALSA: oxfw: share PCM buffer size for both direction
  ALSA: dice: share PCM buffer size for both direction
  ALSA: firewire-digi00x: share PCM buffer size for both direction
  ALSA: firewire-tascam: share PCM buffer size for both direction
  ALSA: firewire-motu: share PCM buffer size for both direction
  ALSA: fireface: share PCM buffer size for both direction
  ALSA: firewire-lib: schedule hardware IRQ according to the size of PCM
    period
  ALSA: firewire-lib: tune the maximum available size of PCM period
  ALSA: firewire-lib: tune the minimum available size of PCM period

 sound/firewire/amdtp-stream.c               | 154 ++++++++++++++------
 sound/firewire/amdtp-stream.h               |   9 +-
 sound/firewire/bebob/bebob.h                |   3 +-
 sound/firewire/bebob/bebob_midi.c           |   2 +-
 sound/firewire/bebob/bebob_pcm.c            |  12 +-
 sound/firewire/bebob/bebob_stream.c         |   5 +-
 sound/firewire/dice/dice-midi.c             |   2 +-
 sound/firewire/dice/dice-pcm.c              |  20 ++-
 sound/firewire/dice/dice-stream.c           |   5 +-
 sound/firewire/dice/dice.h                  |   3 +-
 sound/firewire/digi00x/digi00x-midi.c       |   2 +-
 sound/firewire/digi00x/digi00x-pcm.c        |  12 +-
 sound/firewire/digi00x/digi00x-stream.c     |   5 +-
 sound/firewire/digi00x/digi00x.h            |   3 +-
 sound/firewire/fireface/ff-pcm.c            |  13 +-
 sound/firewire/fireface/ff-stream.c         |   5 +-
 sound/firewire/fireface/ff.h                |   3 +-
 sound/firewire/fireworks/fireworks.h        |   3 +-
 sound/firewire/fireworks/fireworks_midi.c   |   2 +-
 sound/firewire/fireworks/fireworks_pcm.c    |  12 +-
 sound/firewire/fireworks/fireworks_stream.c |   5 +-
 sound/firewire/motu/motu-midi.c             |   2 +-
 sound/firewire/motu/motu-pcm.c              |  12 +-
 sound/firewire/motu/motu-stream.c           |   5 +-
 sound/firewire/motu/motu.h                  |   3 +-
 sound/firewire/oxfw/oxfw-midi.c             |   4 +-
 sound/firewire/oxfw/oxfw-pcm.c              |  17 ++-
 sound/firewire/oxfw/oxfw-stream.c           |   5 +-
 sound/firewire/oxfw/oxfw.h                  |   3 +-
 sound/firewire/tascam/tascam-pcm.c          |  12 +-
 sound/firewire/tascam/tascam-stream.c       |   5 +-
 sound/firewire/tascam/tascam.h              |   3 +-
 32 files changed, 266 insertions(+), 85 deletions(-)

-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 01/12] ALSA: firewire-lib: use variable size of queue for isoc packets instead of fixed size

[Takashi Sakamoto]

The number of packets in packet buffer has been fixed number (=48) since
first commit of ALSA IEC 61883-1/6 packet streaming engine.

This commit allows the engine to use variable number of packets in the
buffer. The size is calculated by a parameter in AMDTP domain structure
surely to store the number of events in the packets of buffer. Although
the value of parameter is expected to come from 'period size' parameter
of PCM substream, at present 48 is still used.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp-stream.c               | 45 +++++++++++++--------
 sound/firewire/amdtp-stream.h               |  6 ++-
 sound/firewire/bebob/bebob_stream.c         |  2 +-
 sound/firewire/dice/dice-stream.c           |  2 +-
 sound/firewire/digi00x/digi00x-stream.c     |  2 +-
 sound/firewire/fireface/ff-stream.c         |  2 +-
 sound/firewire/fireworks/fireworks_stream.c |  2 +-
 sound/firewire/motu/motu-stream.c           |  2 +-
 sound/firewire/oxfw/oxfw-stream.c           |  2 +-
 sound/firewire/tascam/tascam-stream.c       |  2 +-
 10 files changed, 41 insertions(+), 26 deletions(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 838f695b20de..1f38729c8e74 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -54,7 +54,6 @@
 
 /* TODO: make these configurable */
 #define INTERRUPT_INTERVAL	16
-#define QUEUE_LENGTH		48
 
 // For iso header, tstamp and 2 CIP header.
 #define IR_CTX_HEADER_SIZE_CIP		16
@@ -451,7 +450,7 @@ static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params)
 		goto end;
 	}
 
-	if (++s->packet_index >= QUEUE_LENGTH)
+	if (++s->packet_index >= s->queue_size)
 		s->packet_index = 0;
 end:
 	return err;
@@ -669,13 +668,14 @@ static inline u32 increment_cycle_count(u32 cycle, unsigned int addend)
 }
 
 // Align to actual cycle count for the packet which is going to be scheduled.
-// This module queued the same number of isochronous cycle as QUEUE_LENGTH to
-// skip isochronous cycle, therefore it's OK to just increment the cycle by
-// QUEUE_LENGTH for scheduled cycle.
-static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp)
+// This module queued the same number of isochronous cycle as the size of queue
+// to kip isochronous cycle, therefore it's OK to just increment the cycle by
+// the size of queue for scheduled cycle.
+static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp,
+				   unsigned int queue_size)
 {
 	u32 cycle = compute_cycle_count(ctx_header_tstamp);
-	return increment_cycle_count(cycle, QUEUE_LENGTH);
+	return increment_cycle_count(cycle, queue_size);
 }
 
 static int generate_device_pkt_descs(struct amdtp_stream *s,
@@ -689,7 +689,7 @@ static int generate_device_pkt_descs(struct amdtp_stream *s,
 
 	for (i = 0; i < packets; ++i) {
 		struct pkt_desc *desc = descs + i;
-		unsigned int index = (s->packet_index + i) % QUEUE_LENGTH;
+		unsigned int index = (s->packet_index + i) % s->queue_size;
 		unsigned int cycle;
 		unsigned int payload_length;
 		unsigned int data_blocks;
@@ -730,9 +730,9 @@ static void generate_ideal_pkt_descs(struct amdtp_stream *s,
 
 	for (i = 0; i < packets; ++i) {
 		struct pkt_desc *desc = descs + i;
-		unsigned int index = (s->packet_index + i) % QUEUE_LENGTH;
+		unsigned int index = (s->packet_index + i) % s->queue_size;
 
-		desc->cycle = compute_it_cycle(*ctx_header);
+		desc->cycle = compute_it_cycle(*ctx_header, s->queue_size);
 		desc->syt = calculate_syt(s, desc->cycle);
 		desc->data_blocks = calculate_data_blocks(s, desc->syt);
 
@@ -779,12 +779,15 @@ static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
 {
 	struct amdtp_stream *s = private_data;
 	const __be32 *ctx_header = header;
-	unsigned int packets = header_length / sizeof(*ctx_header);
+	unsigned int packets;
 	int i;
 
 	if (s->packet_index < 0)
 		return;
 
+	// Calculate the number of packets in buffer and check XRUN.
+	packets = header_length / sizeof(*ctx_header);
+
 	generate_ideal_pkt_descs(s, s->pkt_descs, ctx_header, packets);
 
 	process_ctx_payloads(s, s->pkt_descs, packets);
@@ -828,7 +831,7 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
 	if (s->packet_index < 0)
 		return;
 
-	// The number of packets in buffer.
+	// Calculate the number of packets in buffer and check XRUN.
 	packets = header_length / s->ctx_data.tx.ctx_header_size;
 
 	err = generate_device_pkt_descs(s, s->pkt_descs, ctx_header, packets);
@@ -874,7 +877,7 @@ static void amdtp_stream_first_callback(struct fw_iso_context *context,
 
 		context->callback.sc = in_stream_callback;
 	} else {
-		cycle = compute_it_cycle(*ctx_header);
+		cycle = compute_it_cycle(*ctx_header, s->queue_size);
 
 		context->callback.sc = out_stream_callback;
 	}
@@ -894,7 +897,8 @@ static void amdtp_stream_first_callback(struct fw_iso_context *context,
  * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI
  * device can be started.
  */
-static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
+static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
+			      struct amdtp_domain *d)
 {
 	static const struct {
 		unsigned int data_block;
@@ -908,6 +912,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
 		[CIP_SFC_88200]  = {  0,   67 },
 		[CIP_SFC_176400] = {  0,   67 },
 	};
+	unsigned int events_per_buffer = d->events_per_buffer;
 	unsigned int ctx_header_size;
 	unsigned int max_ctx_payload_size;
 	enum dma_data_direction dir;
@@ -953,7 +958,13 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
 			max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP;
 	}
 
-	err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH,
+	if (events_per_buffer == 0)
+		events_per_buffer = INTERRUPT_INTERVAL * 3;
+
+	s->queue_size = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_buffer,
+				     amdtp_rate_table[s->sfc]);
+
+	err = iso_packets_buffer_init(&s->buffer, s->unit, s->queue_size,
 				      max_ctx_payload_size, dir);
 	if (err < 0)
 		goto err_unlock;
@@ -981,7 +992,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
 	else
 		s->tag = TAG_CIP;
 
-	s->pkt_descs = kcalloc(INTERRUPT_INTERVAL, sizeof(*s->pkt_descs),
+	s->pkt_descs = kcalloc(s->queue_size, sizeof(*s->pkt_descs),
 			       GFP_KERNEL);
 	if (!s->pkt_descs) {
 		err = -ENOMEM;
@@ -1196,7 +1207,7 @@ int amdtp_domain_start(struct amdtp_domain *d)
 	int err = 0;
 
 	list_for_each_entry(s, &d->streams, list) {
-		err = amdtp_stream_start(s, s->channel, s->speed);
+		err = amdtp_stream_start(s, s->channel, s->speed, d);
 		if (err < 0)
 			break;
 	}
diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h
index d95a4ed15f20..8d541727e437 100644
--- a/sound/firewire/amdtp-stream.h
+++ b/sound/firewire/amdtp-stream.h
@@ -117,6 +117,7 @@ struct amdtp_stream {
 	/* For packet processing. */
 	struct fw_iso_context *context;
 	struct iso_packets_buffer buffer;
+	unsigned int queue_size;
 	int packet_index;
 	struct pkt_desc *pkt_descs;
 	int tag;
@@ -274,6 +275,7 @@ struct amdtp_domain {
 	struct list_head streams;
 
 	unsigned int events_per_period;
+	unsigned int events_per_buffer;
 };
 
 int amdtp_domain_init(struct amdtp_domain *d);
@@ -286,9 +288,11 @@ int amdtp_domain_start(struct amdtp_domain *d);
 void amdtp_domain_stop(struct amdtp_domain *d);
 
 static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d,
-						unsigned int events_per_period)
+						unsigned int events_per_period,
+						unsigned int events_per_buffer)
 {
 	d->events_per_period = events_per_period;
+	d->events_per_buffer = events_per_buffer;
 
 	return 0;
 }
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index f1db3ddc3e00..e8e9eca6f116 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -610,7 +610,7 @@ int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&bebob->domain,
-							 frames_per_period);
+							 frames_per_period, 0);
 		if (err < 0) {
 			cmp_connection_release(&bebob->out_conn);
 			cmp_connection_release(&bebob->in_conn);
diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index ef36bf588d11..b4ef08bd7e8f 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -327,7 +327,7 @@ int snd_dice_stream_reserve_duplex(struct snd_dice *dice, unsigned int rate,
 			goto error;
 
 		err = amdtp_domain_set_events_per_period(&dice->domain,
-							 events_per_period);
+							 events_per_period, 0);
 		if (err < 0)
 			goto error;
 	}
diff --git a/sound/firewire/digi00x/digi00x-stream.c b/sound/firewire/digi00x/digi00x-stream.c
index 96d331e47b07..83659fc0ef25 100644
--- a/sound/firewire/digi00x/digi00x-stream.c
+++ b/sound/firewire/digi00x/digi00x-stream.c
@@ -318,7 +318,7 @@ int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&dg00x->domain,
-							 frames_per_period);
+							 frames_per_period, 0);
 		if (err < 0) {
 			fw_iso_resources_free(&dg00x->rx_resources);
 			fw_iso_resources_free(&dg00x->tx_resources);
diff --git a/sound/firewire/fireface/ff-stream.c b/sound/firewire/fireface/ff-stream.c
index d05e7d3055e1..cbe0e5087b05 100644
--- a/sound/firewire/fireface/ff-stream.c
+++ b/sound/firewire/fireface/ff-stream.c
@@ -153,7 +153,7 @@ int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
 			return err;
 
 		err = amdtp_domain_set_events_per_period(&ff->domain,
-							 frames_per_period);
+							 frames_per_period, 0);
 		if (err < 0) {
 			fw_iso_resources_free(&ff->tx_resources);
 			fw_iso_resources_free(&ff->rx_resources);
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index 0787d5c3b01b..e4d4dd08c60a 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -231,7 +231,7 @@ int snd_efw_stream_reserve_duplex(struct snd_efw *efw, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&efw->domain,
-							 frames_per_period);
+							 frames_per_period, 0);
 		if (err < 0) {
 			cmp_connection_release(&efw->in_conn);
 			cmp_connection_release(&efw->out_conn);
diff --git a/sound/firewire/motu/motu-stream.c b/sound/firewire/motu/motu-stream.c
index 52b7c375bb0b..97245c670732 100644
--- a/sound/firewire/motu/motu-stream.c
+++ b/sound/firewire/motu/motu-stream.c
@@ -174,7 +174,7 @@ int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&motu->domain,
-							 frames_per_period);
+							 frames_per_period, 0);
 		if (err < 0) {
 			fw_iso_resources_free(&motu->tx_resources);
 			fw_iso_resources_free(&motu->rx_resources);
diff --git a/sound/firewire/oxfw/oxfw-stream.c b/sound/firewire/oxfw/oxfw-stream.c
index 7d2e88c5b73d..318de8217b3a 100644
--- a/sound/firewire/oxfw/oxfw-stream.c
+++ b/sound/firewire/oxfw/oxfw-stream.c
@@ -308,7 +308,7 @@ int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 		}
 
 		err = amdtp_domain_set_events_per_period(&oxfw->domain,
-							frames_per_period);
+							frames_per_period, 0);
 		if (err < 0) {
 			cmp_connection_release(&oxfw->in_conn);
 			if (oxfw->has_output)
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c
index 8c04a0ad17d9..1e4d44ed8bed 100644
--- a/sound/firewire/tascam/tascam-stream.c
+++ b/sound/firewire/tascam/tascam-stream.c
@@ -416,7 +416,7 @@ int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&tscm->domain,
-							frames_per_period);
+							frames_per_period, 0);
 		if (err < 0) {
 			fw_iso_resources_free(&tscm->tx_resources);
 			fw_iso_resources_free(&tscm->rx_resources);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 02/12] ALSA: bebob: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA bebob driver to share PCM buffer size for both
capture and playback PCM substream. When AMDTP domain starts for one
of the PCM substream, buffer size of the PCM substream is stores to
AMDTP domain structure. Some AMDTP streams have already run with the
buffer size when another PCM substream starts, therefore the PCM
substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/bebob/bebob.h        |  3 ++-
 sound/firewire/bebob/bebob_midi.c   |  2 +-
 sound/firewire/bebob/bebob_pcm.c    | 12 +++++++++++-
 sound/firewire/bebob/bebob_stream.c |  5 +++--
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index 8738c1d8abf7..d1ad9a8451bc 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -218,7 +218,8 @@ int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
 int snd_bebob_stream_discover(struct snd_bebob *bebob);
 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob);
 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
-				    unsigned int frames_per_period);
+				    unsigned int frames_per_period,
+				    unsigned int frames_per_buffer);
 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob);
 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob);
 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob);
diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c
index e8f9edf50be5..6f597d03e7c1 100644
--- a/sound/firewire/bebob/bebob_midi.c
+++ b/sound/firewire/bebob/bebob_midi.c
@@ -17,7 +17,7 @@ static int midi_open(struct snd_rawmidi_substream *substream)
 		return err;
 
 	mutex_lock(&bebob->mutex);
-	err = snd_bebob_stream_reserve_duplex(bebob, 0, 0);
+	err = snd_bebob_stream_reserve_duplex(bebob, 0, 0, 0);
 	if (err >= 0) {
 		++bebob->substreams_counter;
 		err = snd_bebob_stream_start_duplex(bebob);
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index 516c9874f4a1..8b2e0ceffe82 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -157,6 +157,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
 	    (bebob->substreams_counter > 0 && d->events_per_period > 0)) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int sampling_rate;
 
 		err = spec->get(bebob, &sampling_rate);
@@ -178,6 +179,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&bebob->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&bebob->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -213,10 +222,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&bebob->mutex);
 		err = snd_bebob_stream_reserve_duplex(bebob, rate,
-						      frames_per_period);
+					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++bebob->substreams_counter;
 		mutex_unlock(&bebob->mutex);
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index e8e9eca6f116..5e4a61458be2 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -555,7 +555,8 @@ static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
 }
 
 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
-				    unsigned int frames_per_period)
+				    unsigned int frames_per_period,
+				    unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -610,7 +611,7 @@ int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&bebob->domain,
-							 frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			cmp_connection_release(&bebob->out_conn);
 			cmp_connection_release(&bebob->in_conn);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 03/12] ALSA: fireworks: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA fireworks driver to share PCM buffer size for
both capture and playback PCM substream. When AMDTP domain starts for
one of the PCM substream, buffer size of the PCM substream is stores
to AMDTP domain structure. Some AMDTP streams have already run with the
buffer size when another PCM substream starts, therefore the PCM
substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/fireworks/fireworks.h        |  3 ++-
 sound/firewire/fireworks/fireworks_midi.c   |  2 +-
 sound/firewire/fireworks/fireworks_pcm.c    | 12 +++++++++++-
 sound/firewire/fireworks/fireworks_stream.c |  5 +++--
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/sound/firewire/fireworks/fireworks.h b/sound/firewire/fireworks/fireworks.h
index fc5f945a49ff..dda797209a27 100644
--- a/sound/firewire/fireworks/fireworks.h
+++ b/sound/firewire/fireworks/fireworks.h
@@ -208,7 +208,8 @@ int snd_efw_command_set_sampling_rate(struct snd_efw *efw, unsigned int rate);
 
 int snd_efw_stream_init_duplex(struct snd_efw *efw);
 int snd_efw_stream_reserve_duplex(struct snd_efw *efw, unsigned int rate,
-				  unsigned int frames_per_period);
+				  unsigned int frames_per_period,
+				  unsigned int frames_per_buffer);
 int snd_efw_stream_start_duplex(struct snd_efw *efw);
 void snd_efw_stream_stop_duplex(struct snd_efw *efw);
 void snd_efw_stream_update_duplex(struct snd_efw *efw);
diff --git a/sound/firewire/fireworks/fireworks_midi.c b/sound/firewire/fireworks/fireworks_midi.c
index e593f842ee8f..84621e356848 100644
--- a/sound/firewire/fireworks/fireworks_midi.c
+++ b/sound/firewire/fireworks/fireworks_midi.c
@@ -17,7 +17,7 @@ static int midi_open(struct snd_rawmidi_substream *substream)
 		goto end;
 
 	mutex_lock(&efw->mutex);
-	err = snd_efw_stream_reserve_duplex(efw, 0, 0);
+	err = snd_efw_stream_reserve_duplex(efw, 0, 0, 0);
 	if (err >= 0) {
 		++efw->substreams_counter;
 		err = snd_efw_stream_start_duplex(efw);
diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index 314d1f8b8344..abcc53dac8a5 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -197,6 +197,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) ||
 	    (efw->substreams_counter > 0 && d->events_per_period > 0)) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int sampling_rate;
 
 		err = snd_efw_command_get_sampling_rate(efw, &sampling_rate);
@@ -215,6 +216,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&efw->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&efw->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -249,10 +258,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&efw->mutex);
 		err = snd_efw_stream_reserve_duplex(efw, rate,
-						    frames_per_period);
+					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++efw->substreams_counter;
 		mutex_unlock(&efw->mutex);
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index e4d4dd08c60a..f35a33d4d4e6 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -182,7 +182,8 @@ static int keep_resources(struct snd_efw *efw, struct amdtp_stream *stream,
 }
 
 int snd_efw_stream_reserve_duplex(struct snd_efw *efw, unsigned int rate,
-				  unsigned int frames_per_period)
+				  unsigned int frames_per_period,
+				  unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -231,7 +232,7 @@ int snd_efw_stream_reserve_duplex(struct snd_efw *efw, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&efw->domain,
-							 frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			cmp_connection_release(&efw->in_conn);
 			cmp_connection_release(&efw->out_conn);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 04/12] ALSA: oxfw: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA oxfw driver to share PCM buffer size for both
capture and playback PCM substream. When AMDTP domain starts for one
of the PCM substream, buffer size of the PCM substream is stores to
AMDTP domain structure. Some AMDTP streams have already run with the
buffer size when another PCM substream starts, therefore the PCM
substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/oxfw/oxfw-midi.c   |  4 ++--
 sound/firewire/oxfw/oxfw-pcm.c    | 17 +++++++++++++++--
 sound/firewire/oxfw/oxfw-stream.c |  5 +++--
 sound/firewire/oxfw/oxfw.h        |  3 ++-
 4 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/sound/firewire/oxfw/oxfw-midi.c b/sound/firewire/oxfw/oxfw-midi.c
index 72db7a17d0ad..775cba3f1f02 100644
--- a/sound/firewire/oxfw/oxfw-midi.c
+++ b/sound/firewire/oxfw/oxfw-midi.c
@@ -18,7 +18,7 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&oxfw->mutex);
 
-	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0, 0);
+	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0, 0, 0);
 	if (err >= 0) {
 		++oxfw->substreams_count;
 		err = snd_oxfw_stream_start_duplex(oxfw);
@@ -45,7 +45,7 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&oxfw->mutex);
 
-	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0, 0);
+	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0, 0, 0);
 	if (err >= 0) {
 		++oxfw->substreams_count;
 		err = snd_oxfw_stream_start_duplex(oxfw);
diff --git a/sound/firewire/oxfw/oxfw-pcm.c b/sound/firewire/oxfw/oxfw-pcm.c
index f3e25898d270..ba586d1ac91d 100644
--- a/sound/firewire/oxfw/oxfw-pcm.c
+++ b/sound/firewire/oxfw/oxfw-pcm.c
@@ -188,6 +188,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	// at current one.
 	if (oxfw->substreams_count > 0 && d->events_per_period > 0) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 
 		err = limit_to_current_params(substream);
 		if (err < 0) {
@@ -203,6 +204,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&oxfw->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&oxfw->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -239,10 +248,12 @@ static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
 		unsigned int rate = params_rate(hw_params);
 		unsigned int channels = params_channels(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&oxfw->mutex);
 		err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream,
-					rate, channels, frames_per_period);
+					rate, channels, frames_per_period,
+					frames_per_buffer);
 		if (err >= 0)
 			++oxfw->substreams_count;
 		mutex_unlock(&oxfw->mutex);
@@ -265,10 +276,12 @@ static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
 		unsigned int rate = params_rate(hw_params);
 		unsigned int channels = params_channels(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&oxfw->mutex);
 		err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream,
-					rate, channels, frames_per_period);
+					rate, channels, frames_per_period,
+					frames_per_buffer);
 		if (err >= 0)
 			++oxfw->substreams_count;
 		mutex_unlock(&oxfw->mutex);
diff --git a/sound/firewire/oxfw/oxfw-stream.c b/sound/firewire/oxfw/oxfw-stream.c
index 318de8217b3a..995e9c5bd84b 100644
--- a/sound/firewire/oxfw/oxfw-stream.c
+++ b/sound/firewire/oxfw/oxfw-stream.c
@@ -245,7 +245,8 @@ static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 				   struct amdtp_stream *stream,
 				   unsigned int rate, unsigned int pcm_channels,
-				   unsigned int frames_per_period)
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer)
 {
 	struct snd_oxfw_stream_formation formation;
 	enum avc_general_plug_dir dir;
@@ -308,7 +309,7 @@ int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 		}
 
 		err = amdtp_domain_set_events_per_period(&oxfw->domain,
-							frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			cmp_connection_release(&oxfw->in_conn);
 			if (oxfw->has_output)
diff --git a/sound/firewire/oxfw/oxfw.h b/sound/firewire/oxfw/oxfw.h
index 422746ef2439..c30e537087b0 100644
--- a/sound/firewire/oxfw/oxfw.h
+++ b/sound/firewire/oxfw/oxfw.h
@@ -104,7 +104,8 @@ int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw);
 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 				   struct amdtp_stream *stream,
 				   unsigned int rate, unsigned int pcm_channels,
-				   unsigned int frames_per_period);
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer);
 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw);
 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw);
 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 05/12] ALSA: dice: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA dice driver to share PCM buffer size for both
capture and playback PCM substream. When AMDTP domain starts for one
of the PCM substream, buffer size of the PCM substream is stores to
AMDTP domain structure. Some AMDTP streams have already run with the
buffer size when another PCM substream starts, therefore the PCM
substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/dice/dice-midi.c   |  2 +-
 sound/firewire/dice/dice-pcm.c    | 20 +++++++++++++++++---
 sound/firewire/dice/dice-stream.c |  5 +++--
 sound/firewire/dice/dice.h        |  3 ++-
 4 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/sound/firewire/dice/dice-midi.c b/sound/firewire/dice/dice-midi.c
index 69c3c06bd7aa..4c2998034313 100644
--- a/sound/firewire/dice/dice-midi.c
+++ b/sound/firewire/dice/dice-midi.c
@@ -17,7 +17,7 @@ static int midi_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&dice->mutex);
 
-	err = snd_dice_stream_reserve_duplex(dice, 0, 0);
+	err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
 	if (err >= 0) {
 		++dice->substreams_counter;
 		err = snd_dice_stream_start_duplex(dice);
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 813c9ffbeced..7c0c34c5bd47 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -204,6 +204,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (!internal ||
 	    (dice->substreams_counter > 0 && d->events_per_period > 0)) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int rate;
 
 		err = snd_dice_transaction_get_rate(dice, &rate);
@@ -217,8 +218,10 @@ static int pcm_open(struct snd_pcm_substream *substream)
 
 		if (frames_per_period > 0) {
 			// For double_pcm_frame quirk.
-			if (rate > 96000)
+			if (rate > 96000) {
 				frames_per_period *= 2;
+				frames_per_buffer *= 2;
+			}
 
 			err = snd_pcm_hw_constraint_minmax(substream->runtime,
 					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
@@ -227,6 +230,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&dice->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&dice->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -263,13 +274,16 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int events_per_period = params_period_size(hw_params);
+		unsigned int events_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&dice->mutex);
 		// For double_pcm_frame quirk.
-		if (rate > 96000)
+		if (rate > 96000) {
 			events_per_period /= 2;
+			events_per_buffer /= 2;
+		}
 		err = snd_dice_stream_reserve_duplex(dice, rate,
-						     events_per_period);
+					events_per_period, events_per_buffer);
 		if (err >= 0)
 			++dice->substreams_counter;
 		mutex_unlock(&dice->mutex);
diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index b4ef08bd7e8f..0cff346e8052 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -279,7 +279,8 @@ static void finish_session(struct snd_dice *dice, struct reg_params *tx_params,
 }
 
 int snd_dice_stream_reserve_duplex(struct snd_dice *dice, unsigned int rate,
-				   unsigned int events_per_period)
+				   unsigned int events_per_period,
+				   unsigned int events_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -327,7 +328,7 @@ int snd_dice_stream_reserve_duplex(struct snd_dice *dice, unsigned int rate,
 			goto error;
 
 		err = amdtp_domain_set_events_per_period(&dice->domain,
-							 events_per_period, 0);
+					events_per_period, events_per_buffer);
 		if (err < 0)
 			goto error;
 	}
diff --git a/sound/firewire/dice/dice.h b/sound/firewire/dice/dice.h
index 1f9e3502974e..16366773e22e 100644
--- a/sound/firewire/dice/dice.h
+++ b/sound/firewire/dice/dice.h
@@ -211,7 +211,8 @@ void snd_dice_stream_stop_duplex(struct snd_dice *dice);
 int snd_dice_stream_init_duplex(struct snd_dice *dice);
 void snd_dice_stream_destroy_duplex(struct snd_dice *dice);
 int snd_dice_stream_reserve_duplex(struct snd_dice *dice, unsigned int rate,
-				   unsigned int events_per_period);
+				   unsigned int events_per_period,
+				   unsigned int events_per_buffer);
 void snd_dice_stream_update_duplex(struct snd_dice *dice);
 int snd_dice_stream_detect_current_formats(struct snd_dice *dice);
 
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 06/12] ALSA: firewire-digi00x: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA firewire-digi00x driver to share PCM buffer
size for both capture and playback PCM substream. When AMDTP domain
starts for one of the PCM substream, buffer size of the PCM substream
is stores to AMDTP domain structure. Some AMDTP streams have already
run with the buffer size when another PCM substream starts, therefore
the PCM substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/digi00x/digi00x-midi.c   |  2 +-
 sound/firewire/digi00x/digi00x-pcm.c    | 12 +++++++++++-
 sound/firewire/digi00x/digi00x-stream.c |  5 +++--
 sound/firewire/digi00x/digi00x.h        |  3 ++-
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/sound/firewire/digi00x/digi00x-midi.c b/sound/firewire/digi00x/digi00x-midi.c
index a407e795d8e7..68eb8c39afa6 100644
--- a/sound/firewire/digi00x/digi00x-midi.c
+++ b/sound/firewire/digi00x/digi00x-midi.c
@@ -17,7 +17,7 @@ static int midi_open(struct snd_rawmidi_substream *substream)
 		return err;
 
 	mutex_lock(&dg00x->mutex);
-	err = snd_dg00x_stream_reserve_duplex(dg00x, 0, 0);
+	err = snd_dg00x_stream_reserve_duplex(dg00x, 0, 0, 0);
 	if (err >= 0) {
 		++dg00x->substreams_counter;
 		err = snd_dg00x_stream_start_duplex(dg00x);
diff --git a/sound/firewire/digi00x/digi00x-pcm.c b/sound/firewire/digi00x/digi00x-pcm.c
index 8dbfb3ff17f6..c9a833dff20d 100644
--- a/sound/firewire/digi00x/digi00x-pcm.c
+++ b/sound/firewire/digi00x/digi00x-pcm.c
@@ -135,6 +135,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if ((clock != SND_DG00X_CLOCK_INTERNAL) ||
 	    (dg00x->substreams_counter > 0 && d->events_per_period > 0)) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int rate;
 
 		err = snd_dg00x_stream_get_external_rate(dg00x, &rate);
@@ -153,6 +154,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&dg00x->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&dg00x->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -189,10 +198,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&dg00x->mutex);
 		err = snd_dg00x_stream_reserve_duplex(dg00x, rate,
-						      frames_per_period);
+					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++dg00x->substreams_counter;
 		mutex_unlock(&dg00x->mutex);
diff --git a/sound/firewire/digi00x/digi00x-stream.c b/sound/firewire/digi00x/digi00x-stream.c
index 83659fc0ef25..0c539188ba18 100644
--- a/sound/firewire/digi00x/digi00x-stream.c
+++ b/sound/firewire/digi00x/digi00x-stream.c
@@ -284,7 +284,8 @@ void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x)
 }
 
 int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,
-				    unsigned int frames_per_period)
+				    unsigned int frames_per_period,
+				    unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -318,7 +319,7 @@ int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&dg00x->domain,
-							 frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			fw_iso_resources_free(&dg00x->rx_resources);
 			fw_iso_resources_free(&dg00x->tx_resources);
diff --git a/sound/firewire/digi00x/digi00x.h b/sound/firewire/digi00x/digi00x.h
index d93694282568..129de8edd5ea 100644
--- a/sound/firewire/digi00x/digi00x.h
+++ b/sound/firewire/digi00x/digi00x.h
@@ -142,7 +142,8 @@ int snd_dg00x_stream_check_external_clock(struct snd_dg00x *dg00x,
 					  bool *detect);
 int snd_dg00x_stream_init_duplex(struct snd_dg00x *dg00x);
 int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,
-				    unsigned int frames_per_period);
+				    unsigned int frames_per_period,
+				    unsigned int frames_per_buffer);
 int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x);
 void snd_dg00x_stream_stop_duplex(struct snd_dg00x *dg00x);
 void snd_dg00x_stream_update_duplex(struct snd_dg00x *dg00x);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 07/12] ALSA: firewire-tascam: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA firewire-tascam driver to share PCM buffer
size for both capture and playback PCM substream. When AMDTP domain
starts for one of the PCM substream, buffer size of the PCM substream
is stores to AMDTP domain structure. Some AMDTP streams have already
run with the buffer size when another PCM substream starts, therefore
the PCM substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/tascam/tascam-pcm.c    | 12 +++++++++++-
 sound/firewire/tascam/tascam-stream.c |  5 +++--
 sound/firewire/tascam/tascam.h        |  3 ++-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/sound/firewire/tascam/tascam-pcm.c b/sound/firewire/tascam/tascam-pcm.c
index 6cd3a420fbdf..b18664fdf955 100644
--- a/sound/firewire/tascam/tascam-pcm.c
+++ b/sound/firewire/tascam/tascam-pcm.c
@@ -66,6 +66,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	// at current one.
 	if (clock != SND_TSCM_CLOCK_INTERNAL || tscm->substreams_counter > 0) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int rate;
 
 		err = snd_tscm_stream_get_rate(tscm, &rate);
@@ -83,6 +84,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 			mutex_unlock(&tscm->mutex);
 			goto err_locked;
 		}
+
+		err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+		if (err < 0) {
+			mutex_unlock(&tscm->mutex);
+			goto err_locked;
+		}
 	}
 
 	mutex_unlock(&tscm->mutex);
@@ -118,10 +127,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&tscm->mutex);
 		err = snd_tscm_stream_reserve_duplex(tscm, rate,
-						     frames_per_period);
+					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++tscm->substreams_counter;
 		mutex_unlock(&tscm->mutex);
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c
index 1e4d44ed8bed..a9b3b7eb6d21 100644
--- a/sound/firewire/tascam/tascam-stream.c
+++ b/sound/firewire/tascam/tascam-stream.c
@@ -384,7 +384,8 @@ void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm)
 }
 
 int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
-				   unsigned int frames_per_period)
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -416,7 +417,7 @@ int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&tscm->domain,
-							frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			fw_iso_resources_free(&tscm->tx_resources);
 			fw_iso_resources_free(&tscm->rx_resources);
diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h
index 32e72a25bf46..78b7a08986a1 100644
--- a/sound/firewire/tascam/tascam.h
+++ b/sound/firewire/tascam/tascam.h
@@ -169,7 +169,8 @@ int snd_tscm_stream_init_duplex(struct snd_tscm *tscm);
 void snd_tscm_stream_update_duplex(struct snd_tscm *tscm);
 void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm);
 int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
-				   unsigned int frames_per_period);
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer);
 int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate);
 void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm);
 
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 08/12] ALSA: firewire-motu: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA firewire-motu driver to share PCM buffer
size for both capture and playback PCM substream. When AMDTP domain
starts for one of the PCM substream, buffer size of the PCM substream
is stores to AMDTP domain structure. Some AMDTP streams have already
run with the buffer size when another PCM substream starts, therefore
the PCM substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/motu/motu-midi.c   |  2 +-
 sound/firewire/motu/motu-pcm.c    | 12 +++++++++++-
 sound/firewire/motu/motu-stream.c |  5 +++--
 sound/firewire/motu/motu.h        |  3 ++-
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/sound/firewire/motu/motu-midi.c b/sound/firewire/motu/motu-midi.c
index 997dd6c8ec31..2365f7dfde26 100644
--- a/sound/firewire/motu/motu-midi.c
+++ b/sound/firewire/motu/motu-midi.c
@@ -17,7 +17,7 @@ static int midi_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&motu->mutex);
 
-	err = snd_motu_stream_reserve_duplex(motu, 0, 0);
+	err = snd_motu_stream_reserve_duplex(motu, 0, 0, 0);
 	if (err >= 0) {
 		++motu->substreams_counter;
 		err = snd_motu_stream_start_duplex(motu);
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index 7bbf8b86a33d..00e693da0cad 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -162,6 +162,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
 	    (motu->substreams_counter > 0 && d->events_per_period > 0)) {
 		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int rate;
 
 		err = protocol->get_clock_rate(motu, &rate);
@@ -179,6 +180,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&motu->mutex);
 				goto err_locked;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&motu->mutex);
+				goto err_locked;
+			}
 		}
 	}
 
@@ -216,10 +225,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&motu->mutex);
 		err = snd_motu_stream_reserve_duplex(motu, rate,
-						     frames_per_period);
+					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++motu->substreams_counter;
 		mutex_unlock(&motu->mutex);
diff --git a/sound/firewire/motu/motu-stream.c b/sound/firewire/motu/motu-stream.c
index 97245c670732..9975770c9b1f 100644
--- a/sound/firewire/motu/motu-stream.c
+++ b/sound/firewire/motu/motu-stream.c
@@ -134,7 +134,8 @@ int snd_motu_stream_cache_packet_formats(struct snd_motu *motu)
 }
 
 int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
-				   unsigned int frames_per_period)
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	int err;
@@ -174,7 +175,7 @@ int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
 		}
 
 		err = amdtp_domain_set_events_per_period(&motu->domain,
-							 frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			fw_iso_resources_free(&motu->tx_resources);
 			fw_iso_resources_free(&motu->rx_resources);
diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h
index a419e6e7daed..35ed8b6bb8e8 100644
--- a/sound/firewire/motu/motu.h
+++ b/sound/firewire/motu/motu.h
@@ -155,7 +155,8 @@ int snd_motu_stream_init_duplex(struct snd_motu *motu);
 void snd_motu_stream_destroy_duplex(struct snd_motu *motu);
 int snd_motu_stream_cache_packet_formats(struct snd_motu *motu);
 int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
-				   unsigned int frames_per_period);
+				   unsigned int frames_per_period,
+				   unsigned int frames_per_buffer);
 int snd_motu_stream_start_duplex(struct snd_motu *motu);
 void snd_motu_stream_stop_duplex(struct snd_motu *motu);
 int snd_motu_stream_lock_try(struct snd_motu *motu);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 09/12] ALSA: fireface: share PCM buffer size for both direction

[Takashi Sakamoto]

This commit allows ALSA fireface driver to share PCM buffer size for
both capture and playback PCM substream. When AMDTP domain starts for
one of the PCM substream, buffer size of the PCM substream is stores to
AMDTP domain structure. Some AMDTP streams have already run with the
buffer size when another PCM substream starts, therefore the PCM
substream has a constraint to its buffer size.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/fireface/ff-pcm.c    | 13 ++++++++++++-
 sound/firewire/fireface/ff-stream.c |  5 +++--
 sound/firewire/fireface/ff.h        |  3 ++-
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c
index 415bc9ccd1c7..005d959f8651 100644
--- a/sound/firewire/fireface/ff-pcm.c
+++ b/sound/firewire/fireface/ff-pcm.c
@@ -180,6 +180,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	} else {
 		if (ff->substreams_counter > 0) {
 			unsigned int frames_per_period = d->events_per_period;
+			unsigned int frames_per_buffer = d->events_per_buffer;
 
 			rate = amdtp_rate_table[ff->rx_stream.sfc];
 			substream->runtime->hw.rate_min = rate;
@@ -192,6 +193,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
 				mutex_unlock(&ff->mutex);
 				goto release_lock;
 			}
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0) {
+				mutex_unlock(&ff->mutex);
+				goto release_lock;
+			}
 		}
 	}
 
@@ -229,9 +238,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
 		mutex_lock(&ff->mutex);
-		err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period);
+		err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period,
+						   frames_per_buffer);
 		if (err >= 0)
 			++ff->substreams_counter;
 		mutex_unlock(&ff->mutex);
diff --git a/sound/firewire/fireface/ff-stream.c b/sound/firewire/fireface/ff-stream.c
index cbe0e5087b05..a13754f914e8 100644
--- a/sound/firewire/fireface/ff-stream.c
+++ b/sound/firewire/fireface/ff-stream.c
@@ -107,7 +107,8 @@ void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
 }
 
 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
-				 unsigned int frames_per_period)
+				 unsigned int frames_per_period,
+				 unsigned int frames_per_buffer)
 {
 	unsigned int curr_rate;
 	enum snd_ff_clock_src src;
@@ -153,7 +154,7 @@ int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
 			return err;
 
 		err = amdtp_domain_set_events_per_period(&ff->domain,
-							 frames_per_period, 0);
+					frames_per_period, frames_per_buffer);
 		if (err < 0) {
 			fw_iso_resources_free(&ff->tx_resources);
 			fw_iso_resources_free(&ff->rx_resources);
diff --git a/sound/firewire/fireface/ff.h b/sound/firewire/fireface/ff.h
index 970d4ae571ee..dc7a20f75983 100644
--- a/sound/firewire/fireface/ff.h
+++ b/sound/firewire/fireface/ff.h
@@ -140,7 +140,8 @@ int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
 int snd_ff_stream_init_duplex(struct snd_ff *ff);
 void snd_ff_stream_destroy_duplex(struct snd_ff *ff);
 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
-				 unsigned int frames_per_period);
+				 unsigned int frames_per_period,
+				 unsigned int frames_per_buffer);
 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate);
 void snd_ff_stream_stop_duplex(struct snd_ff *ff);
 void snd_ff_stream_update_duplex(struct snd_ff *ff);
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 10/12] ALSA: firewire-lib: schedule hardware IRQ according to the size of PCM period

[Takashi Sakamoto]

ALSA IEC 61883-1/6 packet streaming engine controls 1394 OHCI controller
to generate hardware IRQ for fixed number of isochronous packets (=16)
since its first commit.

This commit allow the engine to generate it for variable period according
to the number of event to handle. For outgoing stream, internal
calculator is used to check the accumulated events. For incoming stream,
the number of data block in the packet of stream is used to check the
accumulated events. When it's unavailable, fixed number of packet
roughly calculated in advance is used instead of event counting.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp-stream.c | 70 +++++++++++++++++++++++++++--------
 sound/firewire/amdtp-stream.h |  3 ++
 2 files changed, 58 insertions(+), 15 deletions(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 1f38729c8e74..fd7c3e4d5374 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -52,9 +52,6 @@
 #define CIP_FMT_AM		0x10
 #define AMDTP_FDF_NO_DATA	0xff
 
-/* TODO: make these configurable */
-#define INTERRUPT_INTERVAL	16
-
 // For iso header, tstamp and 2 CIP header.
 #define IR_CTX_HEADER_SIZE_CIP		16
 // For iso header and tstamp.
@@ -435,11 +432,12 @@ static void pcm_period_tasklet(unsigned long data)
 		snd_pcm_period_elapsed(pcm);
 }
 
-static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params)
+static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params,
+			bool sched_irq)
 {
 	int err;
 
-	params->interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL);
+	params->interrupt = sched_irq;
 	params->tag = s->tag;
 	params->sy = 0;
 
@@ -457,21 +455,21 @@ static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params)
 }
 
 static inline int queue_out_packet(struct amdtp_stream *s,
-				   struct fw_iso_packet *params)
+				   struct fw_iso_packet *params, bool sched_irq)
 {
 	params->skip =
 		!!(params->header_length == 0 && params->payload_length == 0);
-	return queue_packet(s, params);
+	return queue_packet(s, params, sched_irq);
 }
 
 static inline int queue_in_packet(struct amdtp_stream *s,
-				  struct fw_iso_packet *params)
+				  struct fw_iso_packet *params, bool sched_irq)
 {
 	// Queue one packet for IR context.
 	params->header_length = s->ctx_data.tx.ctx_header_size;
 	params->payload_length = s->ctx_data.tx.max_ctx_payload_length;
 	params->skip = false;
-	return queue_packet(s, params);
+	return queue_packet(s, params, sched_irq);
 }
 
 static void generate_cip_header(struct amdtp_stream *s, __be32 cip_header[2],
@@ -779,6 +777,8 @@ static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
 {
 	struct amdtp_stream *s = private_data;
 	const __be32 *ctx_header = header;
+	unsigned int events_per_period = s->events_per_period;
+	unsigned int event_count = s->event_count;
 	unsigned int packets;
 	int i;
 
@@ -799,6 +799,7 @@ static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
 			struct fw_iso_packet params;
 			__be32 header[IT_PKT_HEADER_SIZE_CIP / sizeof(__be32)];
 		} template = { {0}, {0} };
+		bool sched_irq = false;
 
 		if (s->ctx_data.rx.syt_override < 0)
 			syt = desc->syt;
@@ -809,12 +810,20 @@ static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
 				    desc->data_blocks, desc->data_block_counter,
 				    syt, i);
 
-		if (queue_out_packet(s, &template.params) < 0) {
+		event_count += desc->data_blocks;
+		if (event_count >= events_per_period) {
+			event_count -= events_per_period;
+			sched_irq = true;
+		}
+
+		if (queue_out_packet(s, &template.params, sched_irq) < 0) {
 			cancel_stream(s);
 			return;
 		}
 	}
 
+	s->event_count = event_count;
+
 	fw_iso_context_queue_flush(s->context);
 }
 
@@ -823,8 +832,10 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
 			       void *private_data)
 {
 	struct amdtp_stream *s = private_data;
-	unsigned int packets;
 	__be32 *ctx_header = header;
+	unsigned int events_per_period = s->events_per_period;
+	unsigned int event_count = s->event_count;
+	unsigned int packets;
 	int i;
 	int err;
 
@@ -845,14 +856,29 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
 	}
 
 	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = s->pkt_descs + i;
 		struct fw_iso_packet params = {0};
+		bool sched_irq = false;
+
+		if (err >= 0) {
+			event_count += desc->data_blocks;
+			if (event_count >= events_per_period) {
+				event_count -= events_per_period;
+				sched_irq = true;
+			}
+		} else {
+			sched_irq =
+				!((s->packet_index + 1) % s->idle_irq_interval);
+		}
 
-		if (queue_in_packet(s, &params) < 0) {
+		if (queue_in_packet(s, &params, sched_irq) < 0) {
 			cancel_stream(s);
 			return;
 		}
 	}
 
+	s->event_count = event_count;
+
 	fw_iso_context_queue_flush(s->context);
 }
 
@@ -913,6 +939,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
 		[CIP_SFC_176400] = {  0,   67 },
 	};
 	unsigned int events_per_buffer = d->events_per_buffer;
+	unsigned int events_per_period = d->events_per_period;
 	unsigned int ctx_header_size;
 	unsigned int max_ctx_payload_size;
 	enum dma_data_direction dir;
@@ -958,11 +985,21 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
 			max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP;
 	}
 
+	// This is a case that AMDTP streams in domain run just for MIDI
+	// substream. Use the number of events equivalent to 10 msec as
+	// interval of hardware IRQ.
+	if (events_per_period == 0)
+		events_per_period = amdtp_rate_table[s->sfc] / 100;
 	if (events_per_buffer == 0)
-		events_per_buffer = INTERRUPT_INTERVAL * 3;
+		events_per_buffer = events_per_period * 3;
 
+	s->idle_irq_interval =
+			DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_period,
+				     amdtp_rate_table[s->sfc]);
 	s->queue_size = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_buffer,
 				     amdtp_rate_table[s->sfc]);
+	s->events_per_period = events_per_period;
+	s->event_count = 0;
 
 	err = iso_packets_buffer_init(&s->buffer, s->unit, s->queue_size,
 				      max_ctx_payload_size, dir);
@@ -1002,12 +1039,15 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
 	s->packet_index = 0;
 	do {
 		struct fw_iso_packet params;
+		bool sched_irq;
+
+		sched_irq = !((s->packet_index + 1) % s->idle_irq_interval);
 		if (s->direction == AMDTP_IN_STREAM) {
-			err = queue_in_packet(s, &params);
+			err = queue_in_packet(s, &params, sched_irq);
 		} else {
 			params.header_length = 0;
 			params.payload_length = 0;
-			err = queue_out_packet(s, &params);
+			err = queue_out_packet(s, &params, sched_irq);
 		}
 		if (err < 0)
 			goto err_pkt_descs;
diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h
index 8d541727e437..344818e936df 100644
--- a/sound/firewire/amdtp-stream.h
+++ b/sound/firewire/amdtp-stream.h
@@ -145,6 +145,9 @@ struct amdtp_stream {
 			int syt_override;
 		} rx;
 	} ctx_data;
+	unsigned int event_count;
+	unsigned int events_per_period;
+	unsigned int idle_irq_interval;
 
 	/* For CIP headers. */
 	unsigned int source_node_id_field;
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 11/12] ALSA: firewire-lib: tune the maximum available size of PCM period

[Takashi Sakamoto]

Linux driver for 1394 OHCI controller voluntarily flushes isoc context
when total size of accumulated context header reached PAGE_SIZE. This
kicks tasklet for the isoc context. This is inconvenient to process
runtime of PCM substream.

This commit adds a restriction of the maximum size of PCM period to
avoid this behaviour.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp-stream.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index fd7c3e4d5374..8a7818130382 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -176,6 +176,8 @@ int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 					struct snd_pcm_runtime *runtime)
 {
 	struct snd_pcm_hardware *hw = &runtime->hw;
+	unsigned int ctx_header_size;
+	unsigned int maximum_usec_per_period;
 	int err;
 
 	hw->info = SNDRV_PCM_INFO_BATCH |
@@ -196,19 +198,24 @@ int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 	hw->period_bytes_max = hw->period_bytes_min * 2048;
 	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
 
-	/*
-	 * Currently firewire-lib processes 16 packets in one software
-	 * interrupt callback. This equals to 2msec but actually the
-	 * interval of the interrupts has a jitter.
-	 * Additionally, even if adding a constraint to fit period size to
-	 * 2msec, actual calculated frames per period doesn't equal to 2msec,
-	 * depending on sampling rate.
-	 * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec.
-	 * Here let us use 5msec for safe period interrupt.
-	 */
+	// Linux driver for 1394 OHCI controller voluntarily flushes isoc
+	// context when total size of accumulated context header reaches
+	// PAGE_SIZE. This kicks tasklet for the isoc context and brings
+	// callback in the middle of scheduled interrupts.
+	// Although AMDTP streams in the same domain use the same events per
+	// IRQ, use the largest size of context header between IT/IR contexts.
+	// Here, use the value of context header in IR context is for both
+	// contexts.
+	if (!(s->flags & CIP_NO_HEADER))
+		ctx_header_size = IR_CTX_HEADER_SIZE_CIP;
+	else
+		ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP;
+	maximum_usec_per_period = USEC_PER_SEC * PAGE_SIZE /
+				  CYCLES_PER_SECOND / ctx_header_size;
+
 	err = snd_pcm_hw_constraint_minmax(runtime,
 					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
-					   5000, UINT_MAX);
+					   5000, maximum_usec_per_period);
 	if (err < 0)
 		goto end;
 
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

[alsa-devel] [PATCH 12/12] ALSA: firewire-lib: tune the minimum available size of PCM period

[Takashi Sakamoto]

In IEC 61883-1/6, one isoc packet can transfer events up to the value of
syt interval. This comes from the interval of isoc cycle. As 1394 OHCI
controller can generate hardware IRQ per isoc packet, the interval is
calculated as 125 usec.

In IEC 61883-1/6, two ways of transmission is described; blocking and
non-blocking methods. In blocking method, the sequence of packet includes
'empty' or 'NODATA' packets which include no events. In non-blocking
method, the number of events per packet is variable up to the syt
interval.

This commit uses double of the value of syt interval as minimum available
size of PCM period due to the above protocol design.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp-stream.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 8a7818130382..7486eec4d958 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -213,9 +213,21 @@ int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
 	maximum_usec_per_period = USEC_PER_SEC * PAGE_SIZE /
 				  CYCLES_PER_SECOND / ctx_header_size;
 
+	// In IEC 61883-6, one isoc packet can transfer events up to the value
+	// of syt interval. This comes from the interval of isoc cycle. As 1394
+	// OHCI controller can generate hardware IRQ per isoc packet, the
+	// interval is 125 usec.
+	// However, there are two ways of transmission in IEC 61883-6; blocking
+	// and non-blocking modes. In blocking mode, the sequence of isoc packet
+	// includes 'empty' or 'NODATA' packets which include no event. In
+	// non-blocking mode, the number of events per packet is variable up to
+	// the syt interval.
+	// Due to the above protocol design, the minimum PCM frames per
+	// interrupt should be double of the value of syt interval, thus it is
+	// 250 usec.
 	err = snd_pcm_hw_constraint_minmax(runtime,
 					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
-					   5000, maximum_usec_per_period);
+					   250, maximum_usec_per_period);
 	if (err < 0)
 		goto end;
 
-- 
2.20.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: [alsa-devel] [PATCH 00/12] ALSA: firewire: configure interval of hw IRQ via ALSA PCM interface

[Takashi Iwai]

On Thu, 17 Oct 2019 17:54:12 +0200,
Takashi Sakamoto wrote:
> 
> Hi,
> 
> ALSA IEC 61883-1/6 packet streaming engine controls OHCI 1394 controller
> to generate hardware IRQ for fixed number (=16) of isoc packets.
> Additionally, the size of packet buffer is fixed for triple of interval
> of hardware IRQ (=48).
> 
> This commit allows ALSA PCM applications to configure these parameters
> by ALSA PCM interface. As a result, the size of PCM period is available
> in the range between 125 usec and 64 msec (or 32 msec). The hardware
> IRQ is scheduled for isoc packet which includes event across PCM period
> boundary.
> 
> Takashi Sakamoto (12):
>   ALSA: firewire-lib: use variable size of queue for isoc packets
>     instead of fixed size
>   ALSA: bebob: share PCM buffer size for both direction
>   ALSA: fireworks: share PCM buffer size for both direction
>   ALSA: oxfw: share PCM buffer size for both direction
>   ALSA: dice: share PCM buffer size for both direction
>   ALSA: firewire-digi00x: share PCM buffer size for both direction
>   ALSA: firewire-tascam: share PCM buffer size for both direction
>   ALSA: firewire-motu: share PCM buffer size for both direction
>   ALSA: fireface: share PCM buffer size for both direction
>   ALSA: firewire-lib: schedule hardware IRQ according to the size of PCM
>     period
>   ALSA: firewire-lib: tune the maximum available size of PCM period
>   ALSA: firewire-lib: tune the minimum available size of PCM period

Applied all 12 patches now.  Thanks.


Takashi
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel