drm/amd/display: Add same check as reset pipes for programing backend regs.

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>

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;