ALSA: firewire-lib: use the same prototype for functions to handle packet

Audio and music units of RME Fireface series use its own protocol for
isochronous packets to transfer data. This protocol requires ALSA IEC
61883-1/6 engine to have alternative functions.

This commit is a preparation for the protocol.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/amdtp-stream-trace.h

@@ -14,8 +14,8 @@
 #include <linux/tracepoint.h>
 
 TRACE_EVENT(in_packet,
-	TP_PROTO(const struct amdtp_stream *s, u32 cycles, u32 cip_header[2], unsigned int payload_quadlets, unsigned int index),
-	TP_ARGS(s, cycles, cip_header, payload_quadlets, index),
+	TP_PROTO(const struct amdtp_stream *s, u32 cycles, u32 cip_header[2], unsigned int payload_length, unsigned int index),
+	TP_ARGS(s, cycles, cip_header, payload_length, index),
 	TP_STRUCT__entry(
 		__field(unsigned int, second)
 		__field(unsigned int, cycle)
@@ -37,7 +37,7 @@ TRACE_EVENT(in_packet,
 		__entry->dest = fw_parent_device(s->unit)->card->node_id;
 		__entry->cip_header0 = cip_header[0];
 		__entry->cip_header1 = cip_header[1];
-		__entry->payload_quadlets = payload_quadlets;
+		__entry->payload_quadlets = payload_length / 4;
 		__entry->packet_index = s->packet_index;
 		__entry->irq = !!in_interrupt();
 		__entry->index = index;

sound/firewire/amdtp-stream.c

@@ -411,13 +411,13 @@ static inline int queue_in_packet(struct amdtp_stream *s)
 			    amdtp_stream_get_max_payload(s));
 }
 
-static int handle_out_packet(struct amdtp_stream *s, unsigned int cycle,
+static int handle_out_packet(struct amdtp_stream *s,
+			     unsigned int payload_length, unsigned int cycle,
 			     unsigned int index)
 {
 	__be32 *buffer;
 	unsigned int syt;
 	unsigned int data_blocks;
-	unsigned int payload_length;
 	unsigned int pcm_frames;
 	struct snd_pcm_substream *pcm;
 
@@ -458,7 +458,7 @@ static int handle_out_packet(struct amdtp_stream *s, unsigned int cycle,
 }
 
 static int handle_in_packet(struct amdtp_stream *s,
-			    unsigned int payload_quadlets, unsigned int cycle,
+			    unsigned int payload_length, unsigned int cycle,
 			    unsigned int index)
 {
 	__be32 *buffer;
@@ -474,7 +474,7 @@ static int handle_in_packet(struct amdtp_stream *s,
 	cip_header[0] = be32_to_cpu(buffer[0]);
 	cip_header[1] = be32_to_cpu(buffer[1]);
 
-	trace_in_packet(s, cycle, cip_header, payload_quadlets, index);
+	trace_in_packet(s, cycle, cip_header, payload_length, index);
 
 	/*
 	 * This module supports 'Two-quadlet CIP header with SYT field'.
@@ -505,7 +505,7 @@ static int handle_in_packet(struct amdtp_stream *s,
 
 	/* Calculate data blocks */
 	fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
-	if (payload_quadlets < 3 ||
+	if (payload_length < 12 ||
 	    (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
 		data_blocks = 0;
 	} else {
@@ -521,7 +521,8 @@ static int handle_in_packet(struct amdtp_stream *s,
 		if (s->flags & CIP_WRONG_DBS)
 			data_block_quadlets = s->data_block_quadlets;
 
-		data_blocks = (payload_quadlets - 2) / data_block_quadlets;
+		data_blocks = (payload_length / 4 - 2) /
+							data_block_quadlets;
 	}
 
 	/* Check data block counter continuity */
@@ -615,7 +616,7 @@ static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
 
 	for (i = 0; i < packets; ++i) {
 		cycle = increment_cycle_count(cycle, 1);
-		if (handle_out_packet(s, cycle, i) < 0) {
+		if (handle_out_packet(s, 0, cycle, i) < 0) {
 			s->packet_index = -1;
 			amdtp_stream_pcm_abort(s);
 			return;
@@ -631,7 +632,7 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
 {
 	struct amdtp_stream *s = private_data;
 	unsigned int i, packets;
-	unsigned int payload_quadlets, max_payload_quadlets;
+	unsigned int payload_length, max_payload_length;
 	__be32 *headers = header;
 	u32 cycle;
 
@@ -647,22 +648,22 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
 	cycle = decrement_cycle_count(cycle, packets);
 
 	/* For buffer-over-run prevention. */
-	max_payload_quadlets = amdtp_stream_get_max_payload(s) / 4;
+	max_payload_length = amdtp_stream_get_max_payload(s);
 
 	for (i = 0; i < packets; i++) {
 		cycle = increment_cycle_count(cycle, 1);
 
 		/* The number of quadlets in this packet */
-		payload_quadlets =
-			(be32_to_cpu(headers[i]) >> ISO_DATA_LENGTH_SHIFT) / 4;
-		if (payload_quadlets > max_payload_quadlets) {
+		payload_length =
+			(be32_to_cpu(headers[i]) >> ISO_DATA_LENGTH_SHIFT);
+		if (payload_length > max_payload_length) {
 			dev_err(&s->unit->device,
-				"Detect jumbo payload: %02x %02x\n",
-				payload_quadlets, max_payload_quadlets);
+				"Detect jumbo payload: %04x %04x\n",
+				payload_length, max_payload_length);
 			break;
 		}
 
-		if (handle_in_packet(s, payload_quadlets, cycle, i) < 0)
+		if (handle_in_packet(s, payload_length, cycle, i) < 0)
 			break;
 	}