[PATCH v6 07/10] soundwire: keep track of Masters in a stream

[Sanyog Kale <sanyog.r.kale@intel.com>]

From: Shreyas NC <shreyas.nc@intel.com>

A multi link bankswitch can be done if the hardware supports and
the stream is handled by multiple Master(s).

This preparatory patch adds support to track m_rt in a stream.

Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
---
 drivers/soundwire/stream.c    | 2 ++
 include/linux/soundwire/sdw.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 7e75a400d03e..539b98ec18d9 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -759,6 +759,7 @@ struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name)
 	stream->name = stream_name;
 	INIT_LIST_HEAD(&stream->master_list);
 	stream->state = SDW_STREAM_ALLOCATED;
+	stream->m_rt_count = 0;
 
 	return stream;
 }
@@ -963,6 +964,7 @@ int sdw_stream_remove_master(struct sdw_bus *bus,
 
 		sdw_master_port_release(bus, m_rt);
 		sdw_release_master_stream(m_rt, stream);
+		stream->m_rt_count--;
 	}
 
 	if (list_empty(&stream->master_list))
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 03df709fb8ef..214e14604d9f 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -771,6 +771,7 @@ struct sdw_stream_params {
  * @master_list: List of Master runtime(s) in this stream.
  * master_list can contain only one m_rt per Master instance
  * for a stream
+ * @m_rt_count: Count of Master runtime(s) in this stream
  */
 struct sdw_stream_runtime {
 	char *name;
@@ -778,6 +779,7 @@ struct sdw_stream_runtime {
 	enum sdw_stream_state state;
 	enum sdw_stream_type type;
 	struct list_head master_list;
+	int m_rt_count;
 };
 
 struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name);
-- 
2.13.0