ALSA: firewire-lib: process payload of isoc context according to packet descriptors

This commit changes each of data block processing layer so that it
receives list of packet descriptor.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/amdtp-am824.c

@@ -345,45 +345,59 @@ static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
 	}
 }
 
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	struct amdtp_am824 *p = s->protocol;
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		write_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			      pcm_frames);
-		pcm_frames = desc->data_blocks * p->frame_multiplier;
-	} else {
-		write_pcm_silence(s, desc->ctx_payload, desc->data_blocks);
-	}
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	if (p->midi_ports) {
-		write_midi_messages(s, desc->ctx_payload, desc->data_blocks,
-				    desc->data_block_counter);
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks * p->frame_multiplier;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
+
+		if (p->midi_ports) {
+			write_midi_messages(s, buf, data_blocks,
+					    desc->data_block_counter);
+		}
 	}
 
 	return pcm_frames;
 }
 
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	struct amdtp_am824 *p = s->protocol;
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		read_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			     pcm_frames);
-		pcm_frames = desc->data_blocks * p->frame_multiplier;
-	}
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks * p->frame_multiplier;
+		}
 
-	if (p->midi_ports) {
-		read_midi_messages(s, desc->ctx_payload, desc->data_blocks,
-				   desc->data_block_counter);
+		if (p->midi_ports) {
+			read_midi_messages(s, buf, data_blocks,
+					   desc->data_block_counter);
+		}
 	}
 
 	return pcm_frames;
@@ -400,15 +414,14 @@ static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
 int amdtp_am824_init(struct amdtp_stream *s, struct fw_unit *unit,
 		     enum amdtp_stream_direction dir, enum cip_flags flags)
 {
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 
 	if (dir == AMDTP_IN_STREAM)
-		process_data_blocks = process_tx_data_blocks;
+		process_ctx_payloads = process_ir_ctx_payloads;
 	else
-		process_data_blocks = process_rx_data_blocks;
+		process_ctx_payloads = process_it_ctx_payloads;
 
 	return amdtp_stream_init(s, unit, dir, flags, CIP_FMT_AM,
-				 process_data_blocks,
-				 sizeof(struct amdtp_am824));
+			process_ctx_payloads, sizeof(struct amdtp_am824));
 }
 EXPORT_SYMBOL_GPL(amdtp_am824_init);

sound/firewire/amdtp-stream.c

@@ -74,16 +74,16 @@ static void pcm_period_tasklet(unsigned long data);
  * @dir: the direction of stream
  * @flags: the packet transmission method to use
  * @fmt: the value of fmt field in CIP header
- * @process_data_blocks: callback handler to process data blocks
+ * @process_ctx_payloads: callback handler to process payloads of isoc context
  * @protocol_size: the size to allocate newly for protocol
  */
 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 		      enum amdtp_stream_direction dir, enum cip_flags flags,
 		      unsigned int fmt,
-		      amdtp_stream_process_data_blocks_t process_data_blocks,
+		      amdtp_stream_process_ctx_payloads_t process_ctx_payloads,
 		      unsigned int protocol_size)
 {
-	if (process_data_blocks == NULL)
+	if (process_ctx_payloads == NULL)
 		return -EINVAL;
 
 	s->protocol = kzalloc(protocol_size, GFP_KERNEL);
@@ -102,7 +102,7 @@ int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 	s->callbacked = false;
 
 	s->fmt = fmt;
-	s->process_data_blocks = process_data_blocks;
+	s->process_ctx_payloads = process_ctx_payloads;
 
 	if (dir == AMDTP_OUT_STREAM)
 		s->ctx_data.rx.syt_override = -1;
@@ -764,18 +764,13 @@ static void process_ctx_payloads(struct amdtp_stream *s,
 				 const struct pkt_desc *descs,
 				 unsigned int packets)
 {
-	int i;
-
-	for (i = 0; i < packets; ++i) {
-		const struct pkt_desc *desc = descs + i;
-		struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
-		unsigned int pcm_frames;
-
-		pcm_frames = s->process_data_blocks(s, desc, pcm);
+	struct snd_pcm_substream *pcm;
+	unsigned int pcm_frames;
 
-		if (pcm && pcm_frames > 0)
-			update_pcm_pointers(s, pcm, pcm_frames);
-	}
+	pcm = READ_ONCE(s->pcm);
+	pcm_frames = s->process_ctx_payloads(s, descs, packets, pcm);
+	if (pcm)
+		update_pcm_pointers(s, pcm, pcm_frames);
 }
 
 static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,

sound/firewire/amdtp-stream.h

@@ -103,9 +103,10 @@ struct pkt_desc {
 };
 
 struct amdtp_stream;
-typedef unsigned int (*amdtp_stream_process_data_blocks_t)(
+typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)(
 						struct amdtp_stream *s,
 						const struct pkt_desc *desc,
+						unsigned int packets,
 						struct snd_pcm_substream *pcm);
 struct amdtp_stream {
 	struct fw_unit *unit;
@@ -168,13 +169,13 @@ struct amdtp_stream {
 
 	/* For backends to process data blocks. */
 	void *protocol;
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 };
 
 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 		      enum amdtp_stream_direction dir, enum cip_flags flags,
 		      unsigned int fmt,
-		      amdtp_stream_process_data_blocks_t process_data_blocks,
+		      amdtp_stream_process_ctx_payloads_t process_ctx_payloads,
 		      unsigned int protocol_size);
 void amdtp_stream_destroy(struct amdtp_stream *s);
 

sound/firewire/digi00x/amdtp-dot.c

@@ -341,39 +341,53 @@ void amdtp_dot_midi_trigger(struct amdtp_stream *s, unsigned int port,
 		WRITE_ONCE(p->midi[port], midi);
 }
 
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		read_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			     pcm_frames);
-		pcm_frames = desc->data_blocks;
-	}
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	read_midi_messages(s, desc->ctx_payload, desc->data_blocks);
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		}
+
+		read_midi_messages(s, buf, data_blocks);
+	}
 
 	return pcm_frames;
 }
 
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		write_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			      pcm_frames);
-		pcm_frames = desc->data_blocks;
-	} else {
-		write_pcm_silence(s, desc->ctx_payload, desc->data_blocks);
-	}
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	write_midi_messages(s, desc->ctx_payload, desc->data_blocks,
-			    desc->data_block_counter);
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
+
+		write_midi_messages(s, buf, data_blocks,
+				    desc->data_block_counter);
+	}
 
 	return pcm_frames;
 }
@@ -381,20 +395,20 @@ static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
 int amdtp_dot_init(struct amdtp_stream *s, struct fw_unit *unit,
 		 enum amdtp_stream_direction dir)
 {
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 	enum cip_flags flags;
 
-	/* Use different mode between incoming/outgoing. */
+	// Use different mode between incoming/outgoing.
 	if (dir == AMDTP_IN_STREAM) {
 		flags = CIP_NONBLOCKING;
-		process_data_blocks = process_tx_data_blocks;
+		process_ctx_payloads = process_ir_ctx_payloads;
 	} else {
 		flags = CIP_BLOCKING;
-		process_data_blocks = process_rx_data_blocks;
+		process_ctx_payloads = process_it_ctx_payloads;
 	}
 
 	return amdtp_stream_init(s, unit, dir, flags, CIP_FMT_AM,
-				 process_data_blocks, sizeof(struct amdtp_dot));
+				process_ctx_payloads, sizeof(struct amdtp_dot));
 }
 
 void amdtp_dot_reset(struct amdtp_stream *s)

sound/firewire/fireface/amdtp-ff.c

@@ -112,34 +112,47 @@ int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
 	return amdtp_stream_add_pcm_hw_constraints(s, runtime);
 }
 
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					   const struct pkt_desc *descs,
+					   unsigned int packets,
 					   struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
-
-	if (pcm) {
-		write_pcm_s32(s, pcm, (__le32 *)desc->ctx_payload,
-			      desc->data_blocks, pcm_frames);
-		pcm_frames = desc->data_blocks;
-	} else {
-		write_pcm_silence(s, (__le32 *)desc->ctx_payload,
-				  desc->data_blocks);
+	int i;
+
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__le32 *buf = (__le32 *)desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
 	}
 
 	return pcm_frames;
 }
 
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		read_pcm_s32(s, pcm, (__le32 *)desc->ctx_payload,
-			     desc->data_blocks, pcm_frames);
-		pcm_frames = desc->data_blocks;
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__le32 *buf = (__le32 *)desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		}
 	}
 
 	return pcm_frames;
@@ -148,13 +161,13 @@ static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
 int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
 		  enum amdtp_stream_direction dir)
 {
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 
 	if (dir == AMDTP_IN_STREAM)
-		process_data_blocks = process_tx_data_blocks;
+		process_ctx_payloads = process_ir_ctx_payloads;
 	else
-		process_data_blocks = process_rx_data_blocks;
+		process_ctx_payloads = process_it_ctx_payloads;
 
 	return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
-				 process_data_blocks, sizeof(struct amdtp_ff));
+				 process_ctx_payloads, sizeof(struct amdtp_ff));
 }

sound/firewire/motu/amdtp-motu.c

@@ -310,23 +310,30 @@ static void __maybe_unused copy_message(u64 *frames, __be32 *buffer,
 	}
 }
 
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	struct amdtp_motu *p = s->protocol;
 	unsigned int pcm_frames = 0;
+	int i;
+
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	trace_data_block_sph(s, desc->data_blocks, desc->ctx_payload);
-	trace_data_block_message(s, desc->data_blocks, desc->ctx_payload);
+		trace_data_block_sph(s, data_blocks, buf);
+		trace_data_block_message(s, data_blocks, buf);
 
-	if (p->midi_ports)
-		read_midi_messages(s, desc->ctx_payload, desc->data_blocks);
+		if (p->midi_ports)
+			read_midi_messages(s, buf, data_blocks);
 
-	if (pcm) {
-		read_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			     pcm_frames);
-		pcm_frames = desc->data_blocks;
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		}
 	}
 
 	return pcm_frames;
@@ -374,30 +381,37 @@ static void write_sph(struct amdtp_stream *s, __be32 *buffer,
 	}
 }
 
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	struct amdtp_motu *p = s->protocol;
 	unsigned int pcm_frames = 0;
+	int i;
 
-	/* TODO: how to interact control messages between userspace? */
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	if (p->midi_ports)
-		write_midi_messages(s, desc->ctx_payload, desc->data_blocks);
+		// TODO: how to interact control messages between userspace?
 
-	if (pcm) {
-		write_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			      pcm_frames);
-		pcm_frames = desc->data_blocks;
-	} else {
-		write_pcm_silence(s, desc->ctx_payload, desc->data_blocks);
-	}
+		if (p->midi_ports)
+			write_midi_messages(s, buf, data_blocks);
 
-	write_sph(s, desc->ctx_payload, desc->data_blocks);
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
 
-	trace_data_block_sph(s, desc->data_blocks, desc->ctx_payload);
-	trace_data_block_message(s, desc->data_blocks, desc->ctx_payload);
+		write_sph(s, buf, data_blocks);
+
+		trace_data_block_sph(s, data_blocks, buf);
+		trace_data_block_message(s, data_blocks, buf);
+	}
 
 	return pcm_frames;
 }
@@ -406,13 +420,13 @@ int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
 		    enum amdtp_stream_direction dir,
 		    const struct snd_motu_protocol *const protocol)
 {
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 	int fmt = CIP_FMT_MOTU;
 	int flags = CIP_BLOCKING;
 	int err;
 
 	if (dir == AMDTP_IN_STREAM) {
-		process_data_blocks = process_tx_data_blocks;
+		process_ctx_payloads = process_ir_ctx_payloads;
 
 		/*
 		 * Units of version 3 transmits packets with invalid CIP header
@@ -431,11 +445,11 @@ int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
 				 CIP_SKIP_DBC_ZERO_CHECK;
 		}
 	} else {
-		process_data_blocks = process_rx_data_blocks;
+		process_ctx_payloads = process_it_ctx_payloads;
 		flags |= CIP_DBC_IS_END_EVENT;
 	}
 
-	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_data_blocks,
+	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_ctx_payloads,
 				sizeof(struct amdtp_motu));
 	if (err < 0)
 		return err;

sound/firewire/tascam/amdtp-tascam.c

@@ -175,35 +175,49 @@ static void read_status_messages(struct amdtp_stream *s,
 	}
 }
 
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		read_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			     pcm_frames);
-		pcm_frames += desc->data_blocks;
-	}
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
 
-	read_status_messages(s, desc->ctx_payload, desc->data_blocks);
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		}
+
+		read_status_messages(s, buf, data_blocks);
+	}
 
 	return pcm_frames;
 }
 
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
-					   const struct pkt_desc *desc,
-					   struct snd_pcm_substream *pcm)
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
 {
 	unsigned int pcm_frames = 0;
+	int i;
 
-	if (pcm) {
-		write_pcm_s32(s, pcm, desc->ctx_payload, desc->data_blocks,
-			      pcm_frames);
-		pcm_frames += desc->data_blocks;
-	} else {
-		write_pcm_silence(s, desc->ctx_payload, desc->data_blocks);
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
 	}
 
 	return pcm_frames;
@@ -212,22 +226,22 @@ static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
 int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit,
 		    enum amdtp_stream_direction dir, unsigned int pcm_channels)
 {
-	amdtp_stream_process_data_blocks_t process_data_blocks;
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 	struct amdtp_tscm *p;
 	unsigned int fmt;
 	int err;
 
 	if (dir == AMDTP_IN_STREAM) {
 		fmt = AMDTP_FMT_TSCM_TX;
-		process_data_blocks = process_tx_data_blocks;
+		process_ctx_payloads = process_ir_ctx_payloads;
 	} else {
 		fmt = AMDTP_FMT_TSCM_RX;
-		process_data_blocks = process_rx_data_blocks;
+		process_ctx_payloads = process_it_ctx_payloads;
 	}
 
 	err = amdtp_stream_init(s, unit, dir,
-				CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt,
-				process_data_blocks, sizeof(struct amdtp_tscm));
+			CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt,
+			process_ctx_payloads, sizeof(struct amdtp_tscm));
 	if (err < 0)
 		return 0;