From: Charlene Liu <charlene.liu@amd.com>
Date: Mon, 28 Aug 2017 19:35:25 -0400
Subject: drm/amd/display: add backlight control in blankstream.
Git-commit: 1e4cee77bbd50d6c868439bfaf8ad61b6c6fcfc3
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@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/dce110/dce110_hw_sequencer.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -778,9 +778,11 @@ void dce110_disable_stream(struct pipe_c
 
 
 	/* blank at encoder level */
-	if (dc_is_dp_signal(pipe_ctx->stream->signal))
+	if (dc_is_dp_signal(pipe_ctx->stream->signal)) {
+		if (pipe_ctx->stream->sink->link->connector_signal == SIGNAL_TYPE_EDP)
+			link->link_enc->funcs->backlight_control(link->link_enc, false);
 		pipe_ctx->stream_res.stream_enc->funcs->dp_blank(pipe_ctx->stream_res.stream_enc);
-
+	}
 	link->link_enc->funcs->connect_dig_be_to_fe(
 			link->link_enc,
 			pipe_ctx->stream_res.stream_enc->id,
@@ -792,12 +794,15 @@ void dce110_unblank_stream(struct pipe_c
 		struct dc_link_settings *link_settings)
 {
 	struct encoder_unblank_param params = { { 0 } };
+	struct dc_link *link = pipe_ctx->stream->sink->link;
 
 	/* only 3 items below are used by unblank */
 	params.pixel_clk_khz =
 		pipe_ctx->stream->timing.pix_clk_khz;
 	params.link_settings.link_rate = link_settings->link_rate;
 	pipe_ctx->stream_res.stream_enc->funcs->dp_unblank(pipe_ctx->stream_res.stream_enc, &params);
+	if (link->connector_signal == SIGNAL_TYPE_EDP)
+			link->link_enc->funcs->backlight_control(link->link_enc, true);
 }