From: Yongqiang Sun <yongqiang.sun@amd.com>
Date: Thu, 6 Apr 2017 16:21:58 -0400
Subject: drm/amd/display: Add same check as reset pipes for programing backend
 regs.
Git-commit: 313bf4ff0180107b687dbd10dde8fd021247cd37
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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 |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1689,6 +1689,10 @@ enum dc_status dce110_apply_ctx_to_hw(
 		if (pipe_ctx->stream == pipe_ctx_old->stream)
 			continue;
 
+		if (pipe_ctx->stream && pipe_ctx_old->stream
+				&& !pipe_need_reprogram(pipe_ctx_old, pipe_ctx))
+			continue;
+
 		if (pipe_ctx->top_pipe)
 			continue;