[PATCH 19/34] drm/amd/display: Expose dither setting functionality to Linux

[harry.wentland@xxxxxxx (Harry Wentland)]

From: "Leo (Sunpeng) Li" <sunpeng.li@xxxxxxx>

We will need this to disable dither for CRC capture.

Change-Id: I3ae4fcd86c74b5ab05ad16559d92e156c6f389bc
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c   | 31 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/amd/display/dc/dc_stream.h |  3 +++
 2 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index a78e0364b1b2..ea5c35166ffa 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -300,6 +300,37 @@ bool dc_stream_get_crc(struct dc *dc, struct dc_stream_state *stream,
 	return false;
 }
 
+void dc_stream_set_dither_option(struct dc_stream_state *stream,
+		enum dc_dither_option option)
+{
+	struct bit_depth_reduction_params params;
+	struct dc_link *link = stream->status.link;
+	struct pipe_ctx *pipes = NULL;
+	int i;
+
+	for (i = 0; i < MAX_PIPES; i++) {
+		if (link->dc->current_state->res_ctx.pipe_ctx[i].stream ==
+				stream) {
+			pipes = &link->dc->current_state->res_ctx.pipe_ctx[i];
+			break;
+		}
+	}
+
+	memset(&params, 0, sizeof(params));
+	if (!pipes)
+		return;
+	if (option > DITHER_OPTION_MAX)
+		return;
+
+	stream->dither_option = option;
+
+	resource_build_bit_depth_reduction_params(stream,
+				&params);
+	stream->bit_depth_params = params;
+	pipes->stream_res.opp->funcs->
+		opp_program_bit_depth_reduction(pipes->stream_res.opp, &params);
+}
+
 void dc_stream_set_static_screen_events(struct dc *dc,
 		struct dc_stream_state **streams,
 		int num_streams,
diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 2d2472ba97bf..78a2bbe0b272 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -287,6 +287,9 @@ void dc_stream_set_static_screen_events(struct dc *dc,
 					int num_streams,
 					const struct dc_static_screen_events *events);
 
+void dc_stream_set_dither_option(struct dc_stream_state *stream,
+				 enum dc_dither_option option);
+
 
 bool dc_stream_adjust_vmin_vmax(struct dc *dc,
 				struct dc_stream_state **stream,
-- 
2.14.1