[11/14] ALSA: dice: Support for non SYT-Match sampling clock source mode
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Message ID 1412422044-15133-12-git-send-email-o-takashi@sakamocchi.jp
State Superseded
Delegated to: Takashi Iwai
Headers show

Commit Message

Takashi Sakamoto Oct. 4, 2014, 11:27 a.m. UTC
This commit allows another mode.

When sampling clock source is SYT-Match mode, devices handle
'presentation timestamp' in received packets and generates sampling clock
according to the information. In this case, driver is synchronization master
and must transfer correct value in SYT field of each packets in outgoing
stream, then the outgoing stream is a master stream.

On the other hand, non SYT-Match mode, devices do this. So drivers must pick
up the value in SYT field of incoming packets and use the value for outgoing
stream. Currently firewire-lib module achieve this work.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/dice/dice-pcm.c         | 37 ++++++++++++++++++++++++++++++++++
 sound/firewire/dice/dice-stream.c      | 35 +++++++++++++++++++++-----------
 sound/firewire/dice/dice-transaction.c |  5 -----
 sound/firewire/dice/dice.h             |  2 --
 4 files changed, 60 insertions(+), 19 deletions(-)

Patch
diff mbox

diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 78b5408..a0dbe0c 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -140,6 +140,8 @@  end:
 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
+	unsigned int source, rate;
+	bool internal;
 	int err;
 
 	err = snd_dice_stream_lock_try(dice);
@@ -149,6 +151,41 @@  static int pcm_open(struct snd_pcm_substream *substream)
 	err = init_hw_info(dice, substream);
 	if (err < 0)
 		goto err_locked;
+
+	err = snd_dice_transaction_get_clock_source(dice, &source);
+	if (err < 0)
+		goto err_locked;
+	switch (source) {
+	case CLOCK_SOURCE_AES1:
+	case CLOCK_SOURCE_AES2:
+	case CLOCK_SOURCE_AES3:
+	case CLOCK_SOURCE_AES4:
+	case CLOCK_SOURCE_AES_ANY:
+	case CLOCK_SOURCE_ADAT:
+	case CLOCK_SOURCE_TDIF:
+	case CLOCK_SOURCE_WC:
+		internal = false;
+		break;
+	default:
+		internal = true;
+		break;
+	}
+
+	/*
+	 * When source of clock is not internal or any PCM streams are running,
+	 * available sampling rate is limited at current sampling rate.
+	 */
+	if (!internal ||
+	    amdtp_stream_pcm_running(&dice->tx_stream) ||
+	    amdtp_stream_pcm_running(&dice->rx_stream)) {
+		err = snd_dice_transaction_get_rate(dice, &rate);
+		if (err < 0)
+			goto err_locked;
+		substream->runtime->hw.rate_min = rate;
+		substream->runtime->hw.rate_max = rate;
+	}
+
+	snd_pcm_set_sync(substream);
 end:
 	return err;
 err_locked:
diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index 2ca62ce..c95709e 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -160,9 +160,29 @@  end:
 
 static int get_sync_mode(struct snd_dice *dice, enum cip_flags *sync_mode)
 {
-	/* Currently, clock source is fixed at SYT-Match mode. */
-	*sync_mode = 0;
-	return 0;
+	u32 source;
+	int err;
+
+	err = snd_dice_transaction_get_clock_source(dice, &source);
+	if (err < 0)
+		goto end;
+
+	switch (source) {
+	/* So-called 'SYT Match' modes, sync_to_syt value of packets received */
+	case CLOCK_SOURCE_ARX4:	/* in 4th stream */
+	case CLOCK_SOURCE_ARX3:	/* in 3rd stream */
+	case CLOCK_SOURCE_ARX2:	/* in 2nd stream */
+		err = -ENOSYS;
+		break;
+	case CLOCK_SOURCE_ARX1:	/* in 1st stream, which this driver uses */
+		*sync_mode = 0;
+		break;
+	default:
+		*sync_mode = CIP_SYNC_TO_DEVICE;
+		break;
+	}
+end:
+	return err;
 }
 
 int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
@@ -316,15 +336,6 @@  int snd_dice_stream_init_duplex(struct snd_dice *dice)
 		goto end;
 
 	err = init_stream(dice, &dice->rx_stream);
-	if (err < 0)
-		goto end;
-
-	/* Currently, clock source is fixed at SYT-Match mode. */
-	err = snd_dice_transaction_set_clock_source(dice, CLOCK_SOURCE_ARX1);
-	if (err < 0) {
-		destroy_stream(dice, &dice->rx_stream);
-		destroy_stream(dice, &dice->tx_stream);
-	}
 end:
 	return err;
 }
diff --git a/sound/firewire/dice/dice-transaction.c b/sound/firewire/dice/dice-transaction.c
index 0f4b52a..01d25bf 100644
--- a/sound/firewire/dice/dice-transaction.c
+++ b/sound/firewire/dice/dice-transaction.c
@@ -137,11 +137,6 @@  int snd_dice_transaction_get_clock_source(struct snd_dice *dice,
 
 	return err;
 }
-int snd_dice_transaction_set_clock_source(struct snd_dice *dice,
-					  unsigned int source)
-{
-	return set_clock_info(dice, UINT_MAX, source);
-}
 
 int snd_dice_transaction_get_rate(struct snd_dice *dice, unsigned int *rate)
 {
diff --git a/sound/firewire/dice/dice.h b/sound/firewire/dice/dice.h
index a868485..8ea5cb4 100644
--- a/sound/firewire/dice/dice.h
+++ b/sound/firewire/dice/dice.h
@@ -152,8 +152,6 @@  static inline int snd_dice_transaction_read_sync(struct snd_dice *dice,
 					 buf, len);
 }
 
-int snd_dice_transaction_set_clock_source(struct snd_dice *dice,
-					  unsigned int source);
 int snd_dice_transaction_get_clock_source(struct snd_dice *dice,
 					  unsigned int *source);
 int snd_dice_transaction_set_rate(struct snd_dice *dice, unsigned int rate);