ALSA: dice: Support for non SYT-Match sampling clock source mode

This commit allows this driver to handle devices with non SYT-Match
sampling clock source.

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.

Furthermore, without SYT-Match and internal clock source, the sampling rate
should be fixed for the other devices connected to the handled device. This
commit add a restriction of sampling rate at this situation.

With these implementations, this driver has no need to set clock source.
This commit remove set function.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 23 insertions, 12 deletions

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index e60b84d7a0f6..20765a05d294 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -161,9 +161,29 @@ 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)
@@ -310,15 +330,6 @@ 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;
 }