firewire: core: use common helper function to serialize phy configuration packet

A common helper function is available to serialize the first quadlet of phy
configuration packet.

This commit is for the purpose.

Link: https://lore.kernel.org/r/20240729134631.127189-4-o-takashi@sakamocchi.jpSigned-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

drivers/firewire/core-cdev.c

@@ -37,6 +37,8 @@
 #include "core.h"
 #include <trace/events/firewire.h>
 
+#include "packet-header-definitions.h"
+
 /*
  * ABI version history is documented in linux/firewire-cdev.h.
  */
@@ -1635,7 +1637,7 @@ static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
 	e->client		= client;
 	e->p.speed		= SCODE_100;
 	e->p.generation		= a->generation;
-	e->p.header[0]		= TCODE_LINK_INTERNAL << 4;
+	async_header_set_tcode(e->p.header, TCODE_LINK_INTERNAL);
 	e->p.header[1]		= a->data[0];
 	e->p.header[2]		= a->data[1];
 	e->p.header_length	= 12;

drivers/firewire/core-transaction.c

@@ -464,7 +464,6 @@ static void transmit_phy_packet_callback(struct fw_packet *packet,
 
 static struct fw_packet phy_config_packet = {
 	.header_length	= 12,
-	.header[0]	= TCODE_LINK_INTERNAL << 4,
 	.payload_length	= 0,
 	.speed		= SCODE_100,
 	.callback	= transmit_phy_packet_callback,
@@ -497,6 +496,7 @@ void fw_send_phy_config(struct fw_card *card,
 
 	mutex_lock(&phy_config_mutex);
 
+	async_header_set_tcode(phy_config_packet.header, TCODE_LINK_INTERNAL);
 	phy_config_packet.header[1] = data;
 	phy_config_packet.header[2] = ~data;
 	phy_config_packet.generation = generation;