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 --- drivers/soundwire/stream.c | 4 ++++ include/linux/soundwire/sdw.h | 2 ++ 2 files changed, 6 insertions(+)
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c index c1a2c3d..71d7e0b 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; } @@ -968,6 +969,7 @@ int sdw_stream_remove_master(struct sdw_bus *bus, if (list_empty(&stream->master_list)) stream->state = SDW_STREAM_RELEASED;
+ stream->m_rt_count--; mutex_unlock(&bus->bus_lock);
return 0; @@ -1166,6 +1168,8 @@ int sdw_stream_add_master(struct sdw_bus *bus, if (ret) goto stream_error;
+ stream->m_rt_count++; + goto unlock;
stream_error: diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 03df709..214e146 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);