soundwire: keep track of Masters in a stream

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.
Modifying m_rt_count and usage is added as part of the next patch.

Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 3d98f20..bd879b1 100644 (file)
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -865,6 +865,7 @@ 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;
 }

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index c6aa2bf..df31391 100644 (file)
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -775,6 +775,7 @@ 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;
@@ -782,6 +783,7 @@ 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);