From: Mikita Lipski <mikita.lipski@amd.com>
Date: Mon, 18 Dec 2017 10:34:56 -0500
Subject: drm/amd/display: Prevent master programming in multisync
Git-commit: 03736f4cf83cb03aa6bdbc768941a4148d9b929c
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Verify that the stream is master - and program only the slave displays

Signed-off-by: Mikita Lipski <mikita.lipski@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/amdgpu_dm/amdgpu_dm.c         |    2 +-
 drivers/gpu/drm/amd/display/dc/core/dc.c                  |    4 +++-
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c |    2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2356,7 +2356,7 @@ static void set_master_stream(struct dc_
 		}
 	}
 	for (j = 0;  j < stream_count; j++) {
-		if (stream_set[j] && j != master_stream)
+		if (stream_set[j])
 			stream_set[j]->triggered_crtc_reset.event_source = stream_set[master_stream];
 	}
 }
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -521,11 +521,13 @@ static void enable_timing_multisync(
 		if (!ctx->res_ctx.pipe_ctx[i].stream ||
 				!ctx->res_ctx.pipe_ctx[i].stream->triggered_crtc_reset.enabled)
 			continue;
+		if (ctx->res_ctx.pipe_ctx[i].stream == ctx->res_ctx.pipe_ctx[i].stream->triggered_crtc_reset.event_source)
+			continue;
 		multisync_pipes[multisync_count] = &ctx->res_ctx.pipe_ctx[i];
 		multisync_count++;
 	}
 
-	if (multisync_count > 1) {
+	if (multisync_count > 0) {
 		dc->hwss.enable_per_frame_crtc_position_reset(
 			dc, multisync_count, multisync_pipes);
 	}
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1121,7 +1121,7 @@ static void dcn10_enable_per_frame_crtc_
 
 	DC_SYNC_INFO("Waiting for trigger\n");
 
-	for (i = 1; i < group_size; i++)
+	for (i = 0; i < group_size; i++)
 		wait_for_reset_trigger_to_occur(dc_ctx, grouped_pipes[i]->stream_res.tg);
 
 	DC_SYNC_INFO("Multi-display sync is complete\n");