[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/sound/firewire/lib.c b/src/kernel/linux/v4.14/sound/firewire/lib.c
new file mode 100644
index 0000000..39dfa74
--- /dev/null
+++ b/src/kernel/linux/v4.14/sound/firewire/lib.c
@@ -0,0 +1,104 @@
+/*
+ * miscellaneous helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "lib.h"
+
+#define ERROR_RETRY_DELAY_MS 20
+
+/**
+ * snd_fw_transaction - send a request and wait for its completion
+ * @unit: the driver's unit on the target device
+ * @tcode: the transaction code
+ * @offset: the address in the target's address space
+ * @buffer: input/output data
+ * @length: length of @buffer
+ * @flags: use %FW_FIXED_GENERATION and add the generation value to attempt the
+ * request only in that generation; use %FW_QUIET to suppress error
+ * messages
+ *
+ * Submits an asynchronous request to the target device, and waits for the
+ * response. The node ID and the current generation are derived from @unit.
+ * On a bus reset or an error, the transaction is retried a few times.
+ * Returns zero on success, or a negative error code.
+ */
+int snd_fw_transaction(struct fw_unit *unit, int tcode,
+ u64 offset, void *buffer, size_t length,
+ unsigned int flags)
+{
+ struct fw_device *device = fw_parent_device(unit);
+ int generation, rcode, tries = 0;
+
+ generation = flags & FW_GENERATION_MASK;
+ for (;;) {
+ if (!(flags & FW_FIXED_GENERATION)) {
+ generation = device->generation;
+ smp_rmb(); /* node_id vs. generation */
+ }
+ rcode = fw_run_transaction(device->card, tcode,
+ device->node_id, generation,
+ device->max_speed, offset,
+ buffer, length);
+
+ if (rcode == RCODE_COMPLETE)
+ return 0;
+
+ if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION))
+ return -EAGAIN;
+
+ if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
+ if (!(flags & FW_QUIET))
+ dev_err(&unit->device,
+ "transaction failed: %s\n",
+ fw_rcode_string(rcode));
+ return -EIO;
+ }
+
+ msleep(ERROR_RETRY_DELAY_MS);
+ }
+}
+EXPORT_SYMBOL(snd_fw_transaction);
+
+#define PROBE_DELAY_MS (2 * MSEC_PER_SEC)
+
+/**
+ * snd_fw_schedule_registration - schedule work for sound card registration
+ * @unit: an instance for unit on IEEE 1394 bus
+ * @dwork: delayed work with callback function
+ *
+ * This function is not designed for general purposes. When new unit is
+ * connected to IEEE 1394 bus, the bus is under bus-reset state because of
+ * topological change. In this state, units tend to fail both of asynchronous
+ * and isochronous communication. To avoid this problem, this function is used
+ * to postpone sound card registration after the state. The callers must
+ * set up instance of delayed work in advance.
+ */
+void snd_fw_schedule_registration(struct fw_unit *unit,
+ struct delayed_work *dwork)
+{
+ u64 now, delay;
+
+ now = get_jiffies_64();
+ delay = fw_parent_device(unit)->card->reset_jiffies
+ + msecs_to_jiffies(PROBE_DELAY_MS);
+
+ if (time_after64(delay, now))
+ delay -= now;
+ else
+ delay = 0;
+
+ mod_delayed_work(system_wq, dwork, delay);
+}
+EXPORT_SYMBOL(snd_fw_schedule_registration);
+
+MODULE_DESCRIPTION("FireWire audio helper functions");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");