[PATCH 02/18] drm/amd/display: Add function to copy DC streams

[sunpeng.li at amd.com]

From: Wenjing Liu <Wenjing.Liu at amd.com>

We'll need the ability to copy a dc_stream_state for some features.
Implement it here.

Change-Id: I74a6b147cb4389f60c376071db22ac8164b2b47b
Signed-off-by: Wenjing Liu <Wenjing.Liu at amd.com>
Reviewed-by: Jun Lei <Jun.Lei at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 21 +++++++++++++++++++++
 drivers/gpu/drm/amd/display/dc/dc_stream.h      |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index e10479d..09d765f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -163,6 +163,27 @@ struct dc_stream_state *dc_create_stream_for_sink(
 	return stream;
 }
 
+struct dc_stream_state *dc_copy_stream(const struct dc_stream_state *stream)
+{
+	struct dc_stream_state *new_stream;
+
+	new_stream = kzalloc(sizeof(struct dc_stream_state), GFP_KERNEL);
+	if (stream == NULL)
+		return NULL;
+
+	memcpy(new_stream, stream, sizeof(struct dc_stream_state));
+
+	if (new_stream->sink)
+		dc_sink_retain(new_stream->sink);
+
+	if (new_stream->out_transfer_func)
+		dc_transfer_func_retain(new_stream->out_transfer_func);
+
+	kref_init(&new_stream->refcount);
+
+	return new_stream;
+}
+
 /**
  * dc_stream_get_status_from_state - Get stream status from given dc state
  * @state: DC state to find the stream status in
diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 17fa3bf6..189bdab 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -307,6 +307,8 @@ enum surface_update_type dc_check_update_surfaces_for_stream(
  */
 struct dc_stream_state *dc_create_stream_for_sink(struct dc_sink *dc_sink);
 
+struct dc_stream_state *dc_copy_stream(const struct dc_stream_state *stream);
+
 void update_stream_signal(struct dc_stream_state *stream, struct dc_sink *sink);
 
 void dc_stream_retain(struct dc_stream_state *dc_stream);
-- 
2.7.4