From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Wed, 30 Oct 2019 08:06:41 +0000 (+0900)
Subject: ALSA: firewire-motu: detect SPH source of sampling clock
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3f58f004bff3273d102583e0b2f478526cf9d3c8;p=linux.git

ALSA: firewire-motu: detect SPH source of sampling clock

In MOTU FireWire series, devices have a mode to generate sampling clock
from a sequence of source packet header (SPH) included in each data block
of received packet. This mode is used for several purposes such as mode
for SMPTE time code, sync to the other sound cards and so on.

This commit adds support for the SPH mode.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191030080644.1704-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index 55d3d6661731e..490408b49157b 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -159,7 +159,8 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	// When source of clock is not internal or any stream is reserved for
 	// transmission of PCM frames, the available sampling rate is limited
 	// at current one.
-	if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
+	if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
+	     src != SND_MOTU_CLOCK_SOURCE_SPH) ||
 	    (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;
diff --git a/sound/firewire/motu/motu-proc.c b/sound/firewire/motu/motu-proc.c
index 4e5767c0c8d76..b47ba818343ff 100644
--- a/sound/firewire/motu/motu-proc.c
+++ b/sound/firewire/motu/motu-proc.c
@@ -19,6 +19,7 @@ static const char *const clock_names[] = {
 	[SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX] = "S/PCIF on coaxial interface",
 	[SND_MOTU_CLOCK_SOURCE_AESEBU_ON_XLR] = "AESEBU on XLR interface",
 	[SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC] = "Word clock on BNC interface",
+	[SND_MOTU_CLOCK_SOURCE_SPH] = "Source packet header",
 	[SND_MOTU_CLOCK_SOURCE_UNKNOWN] = "Unknown",
 };
 
diff --git a/sound/firewire/motu/motu-protocol-v2.c b/sound/firewire/motu/motu-protocol-v2.c
index a42f77fc38580..2757e5b42b9b1 100644
--- a/sound/firewire/motu/motu-protocol-v2.c
+++ b/sound/firewire/motu/motu-protocol-v2.c
@@ -114,6 +114,9 @@ static int v2_get_clock_source(struct snd_motu *motu,
 	case 2:
 		*src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
 		break;
+	case 3:
+		*src = SND_MOTU_CLOCK_SOURCE_SPH;
+		break;
 	case 4:
 		*src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
 		break;
diff --git a/sound/firewire/motu/motu-protocol-v3.c b/sound/firewire/motu/motu-protocol-v3.c
index ba5794c724beb..d1545e2b5caaa 100644
--- a/sound/firewire/motu/motu-protocol-v3.c
+++ b/sound/firewire/motu/motu-protocol-v3.c
@@ -104,6 +104,8 @@ static int v3_get_clock_source(struct snd_motu *motu,
 		*src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
 	} else if (val == 0x01) {
 		*src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
+	} else if (val == 0x02) {
+		*src = SND_MOTU_CLOCK_SOURCE_SPH;
 	} else if (val == 0x10) {
 		*src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
 	} else if (val == 0x18 || val == 0x19) {
diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h
index 08e3d568221d9..bd782ee4e763b 100644
--- a/sound/firewire/motu/motu.h
+++ b/sound/firewire/motu/motu.h
@@ -104,6 +104,7 @@ enum snd_motu_clock_source {
 	SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX,
 	SND_MOTU_CLOCK_SOURCE_AESEBU_ON_XLR,
 	SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC,
+	SND_MOTU_CLOCK_SOURCE_SPH,
 	SND_MOTU_CLOCK_SOURCE_UNKNOWN,
 };