drm/amd/display: Revert "enable plane if plane_status changed"

This reverts commmit fd0293dd.
Signed-off-by: Hugo Hu <hugo.hu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -1209,20 +1209,13 @@ void dcn20_pipe_control_lock(
 
 static void dcn20_detect_pipe_changes(struct pipe_ctx *old_pipe, struct pipe_ctx *new_pipe)
 {
-	bool plane_state_update = false;
 	new_pipe->update_flags.raw = 0;
 
 	/* Exit on unchanged, unused pipe */
 	if (!old_pipe->plane_state && !new_pipe->plane_state)
 		return;
-
-	/* Detect plane state update */
-	if (old_pipe->plane_state && new_pipe->plane_state
-			&& (old_pipe->plane_state != new_pipe->plane_state)) {
-		plane_state_update = true;
-	}
 	/* Detect pipe enable/disable */
-	if ((!old_pipe->plane_state && new_pipe->plane_state) || plane_state_update) {
+	if (!old_pipe->plane_state && new_pipe->plane_state) {
 		new_pipe->update_flags.bits.enable = 1;
 		new_pipe->update_flags.bits.mpcc = 1;
 		new_pipe->update_flags.bits.dppclk = 1;