drm/amd/display: Cursor update refactor: PSR-SU support condition

[Why]
PSR-SU requires extra conditions while cursor update.
Reviewed-by: Robin Chen <robin.chen@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Max Tseng <Max.Tseng@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c

@@ -859,11 +859,59 @@ void dc_dmub_srv_log_diagnostic_data(struct dc_dmub_srv *dc_dmub_srv)
 		diag_data.is_cw6_enabled);
 }
 
+static bool dc_can_pipe_disable_cursor(struct pipe_ctx *pipe_ctx)
+{
+	struct pipe_ctx *test_pipe, *split_pipe;
+	const struct scaler_data *scl_data = &pipe_ctx->plane_res.scl_data;
+	struct rect r1 = scl_data->recout, r2, r2_half;
+	int r1_r = r1.x + r1.width, r1_b = r1.y + r1.height, r2_r, r2_b;
+	int cur_layer = pipe_ctx->plane_state->layer_index;
+
+	/**
+	 * Disable the cursor if there's another pipe above this with a
+	 * plane that contains this pipe's viewport to prevent double cursor
+	 * and incorrect scaling artifacts.
+	 */
+	for (test_pipe = pipe_ctx->top_pipe; test_pipe;
+	     test_pipe = test_pipe->top_pipe) {
+		// Skip invisible layer and pipe-split plane on same layer
+		if (!test_pipe->plane_state->visible || test_pipe->plane_state->layer_index == cur_layer)
+			continue;
+
+		r2 = test_pipe->plane_res.scl_data.recout;
+		r2_r = r2.x + r2.width;
+		r2_b = r2.y + r2.height;
+		split_pipe = test_pipe;
+
+		/**
+		 * There is another half plane on same layer because of
+		 * pipe-split, merge together per same height.
+		 */
+		for (split_pipe = pipe_ctx->top_pipe; split_pipe;
+		     split_pipe = split_pipe->top_pipe)
+			if (split_pipe->plane_state->layer_index == test_pipe->plane_state->layer_index) {
+				r2_half = split_pipe->plane_res.scl_data.recout;
+				r2.x = (r2_half.x < r2.x) ? r2_half.x : r2.x;
+				r2.width = r2.width + r2_half.width;
+				r2_r = r2.x + r2.width;
+				break;
+			}
+
+		if (r1.x >= r2.x && r1.y >= r2.y && r1_r <= r2_r && r1_b <= r2_b)
+			return true;
+	}
+
+	return false;
+}
+
 static bool dc_dmub_should_update_cursor_data(struct pipe_ctx *pipe_ctx)
 {
 	if (pipe_ctx->plane_state != NULL) {
 		if (pipe_ctx->plane_state->address.type == PLN_ADDR_TYPE_VIDEO_PROGRESSIVE)
 			return false;
+
+		if (dc_can_pipe_disable_cursor(pipe_ctx))
+			return false;
 	}
 
 	if ((pipe_ctx->stream->link->psr_settings.psr_version == DC_PSR_VERSION_SU_1 ||