From: Tony Cheng <tony.cheng@amd.com>
Date: Fri, 1 Sep 2017 16:14:01 -0400
Subject: drm/amd/display: fix default dithering
Git-commit: 603767f903bf5bf301728b197dcde63cf880fe2e
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

bug: default is mapped to no dithering.

default to spatial dithering based on color depth

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c                    |   20 +-----------
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c           |   16 +++++++++
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c |   14 +++-----
 3 files changed, 24 insertions(+), 26 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -341,23 +341,9 @@ void set_dither_option(struct dc_stream_
 		return;
 	if (option > DITHER_OPTION_MAX)
 		return;
-	if (option == DITHER_OPTION_DEFAULT) {
-		switch (stream->timing.display_color_depth) {
-		case COLOR_DEPTH_666:
-			stream->dither_option = DITHER_OPTION_SPATIAL6;
-			break;
-		case COLOR_DEPTH_888:
-			stream->dither_option = DITHER_OPTION_SPATIAL8;
-			break;
-		case COLOR_DEPTH_101010:
-			stream->dither_option = DITHER_OPTION_SPATIAL10;
-			break;
-		default:
-			option = DITHER_OPTION_DISABLE;
-		}
-	} else {
-		stream->dither_option = option;
-	}
+
+	stream->dither_option = option;
+
 	resource_build_bit_depth_reduction_params(stream,
 				&params);
 	stream->bit_depth_params = params;
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -2607,6 +2607,22 @@ void resource_build_bit_depth_reduction_
 
 	memset(fmt_bit_depth, 0, sizeof(*fmt_bit_depth));
 
+	if (option == DITHER_OPTION_DEFAULT) {
+		switch (stream->timing.display_color_depth) {
+		case COLOR_DEPTH_666:
+			option = DITHER_OPTION_SPATIAL6;
+			break;
+		case COLOR_DEPTH_888:
+			option = DITHER_OPTION_SPATIAL8;
+			break;
+		case COLOR_DEPTH_101010:
+			option = DITHER_OPTION_SPATIAL10;
+			break;
+		default:
+			option = DITHER_OPTION_DISABLE;
+		}
+	}
+
 	if (option == DITHER_OPTION_DISABLE)
 		return;
 
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1104,15 +1104,11 @@ static enum dc_status apply_single_contr
 		stream->timing.timing_3d_format != TIMING_3D_FORMAT_NONE);
 
 
-/*vbios crtc_source_selection and encoder_setup will override fmt_C*/
-	if (pipe_ctx->stream->signal != SIGNAL_TYPE_EDP &&
-		pipe_ctx->stream->signal != SIGNAL_TYPE_LVDS) {
-	/*for embedded panel, don't override VBIOS's setting*/
-		pipe_ctx->stream_res.opp->funcs->opp_program_fmt(
-			pipe_ctx->stream_res.opp,
-			&stream->bit_depth_params,
-			&stream->clamping);
-	}
+	pipe_ctx->stream_res.opp->funcs->opp_program_fmt(
+		pipe_ctx->stream_res.opp,
+		&stream->bit_depth_params,
+		&stream->clamping);
+
 	if (dc_is_dp_signal(pipe_ctx->stream->signal))
 		pipe_ctx->stream_res.stream_enc->funcs->dp_set_stream_attribute(
 			pipe_ctx->stream_res.stream_enc,