[GPU] Add callback function for MarkDequantizationSubgraph pass to sk…

…ip non FC-related subgraphs

src/plugins/intel_gpu/src/plugin/transformations_pipeline.cpp

@@ -146,6 +146,35 @@ static bool disable_reduce_decomposition(const std::shared_ptr<const ov::Node> n
     }
     return false;
 }
+
+static bool is_non_decompression_multiply(const std::shared_ptr<const ov::Node> node) {
+    auto get_single_consumer = [](const std::shared_ptr<const ov::Node> node) -> std::shared_ptr<ov::Node> {
+        const auto consumers = node->get_output_target_inputs(0);
+        if (consumers.size() != 1)
+            return nullptr;
+        return consumers.begin()->get_node()->shared_from_this();
+    };
+
+    auto consumer = get_single_consumer(node);
+    if (!consumer)
+        return true;
+
+    if (ov::is_type<ov::opset1::MatMul>(consumer)) {
+        return false;
+    } else if (ov::is_type<ov::opset1::Reshape>(consumer)) {
+        consumer = get_single_consumer(consumer);
+        if (consumer != nullptr && ov::is_type<ov::opset1::MatMul>(consumer)) {
+            return false;
+        }
+    }
+    if (consumer != nullptr && ov::is_type<ov::opset1::Convert>(consumer)) {
+        consumer = get_single_consumer(consumer);
+        if (consumer != nullptr && ov::is_type<ov::opset1::MatMul>(consumer)) {
+            return false;
+        }
+    }
+    return true;
+}
 }  // namespace
 
 namespace ov {
@@ -247,6 +276,8 @@ void TransformationsPipeline::apply(std::shared_ptr<ov::Model> func) {
             });
 
         manager.register_pass<ov::pass::MarkDequantizationSubgraph>(ov::element::TypeVector{ov::element::u8, ov::element::u4, ov::element::i4}, true);
+        // Ignore nodes that are not related to FullyConnected and allow ConstantFolding to be applied to them
+        pass_config->set_callback<ov::pass::MarkDequantizationSubgraph>(is_non_decompression_multiply);
 
         const bool keep_precision_sensitive_in_fp32_1 = true;
         const bool convert_input_output_precision = false;