diff --git a/plugins/ai_face_det/ai_face_det_node.cpp b/plugins/ai_face_det/ai_face_det_node.cpp
index 684ce12..e93c327 100644
--- a/plugins/ai_face_det/ai_face_det_node.cpp
+++ b/plugins/ai_face_det/ai_face_det_node.cpp
@@ -14,6 +14,7 @@
 #include "ai_scheduler.h"
 #include "face/face_result.h"
 #include "node.h"
+#include "utils/dma_alloc.h"
 #include "utils/logger.h"
 
 namespace rk3588 {
@@ -515,6 +516,18 @@ private:
 #if defined(RK3588_ENABLE_RKNN)
     void Run(FramePtr frame) {
         if (!frame->data || frame->data_size == 0) return;
+
+        struct ScopedDmaCpuAccess {
+            int fd = -1;
+            bool active = false;
+            explicit ScopedDmaCpuAccess(int f) : fd(f), active(f >= 0) {
+                if (active) DmaSyncStartFd(fd);
+            }
+            ~ScopedDmaCpuAccess() {
+                if (active) DmaSyncEndFd(fd);
+            }
+        } sync(frame->dma_fd);
+
         if (frame->format != PixelFormat::RGB && frame->format != PixelFormat::BGR) {
             std::cerr << "[ai_face_det] input must be RGB/BGR\n";
             return;
diff --git a/plugins/ai_face_recog/ai_face_recog_node.cpp b/plugins/ai_face_recog/ai_face_recog_node.cpp
index 1c20833..7056c56 100644
--- a/plugins/ai_face_recog/ai_face_recog_node.cpp
+++ b/plugins/ai_face_recog/ai_face_recog_node.cpp
@@ -15,6 +15,7 @@
 #include "ai_scheduler.h"
 #include "face/face_result.h"
 #include "node.h"
+#include "utils/dma_alloc.h"
 #include "utils/logger.h"
 
 #if defined(RK3588_ENABLE_SQLITE3)
@@ -776,6 +777,18 @@ private:
     void Run(FramePtr frame) {
         if (!frame->face_det || frame->face_det->faces.empty()) return;
         if (!frame->data || frame->data_size == 0) return;
+
+        struct ScopedDmaCpuAccess {
+            int fd = -1;
+            bool active = false;
+            explicit ScopedDmaCpuAccess(int f) : fd(f), active(f >= 0) {
+                if (active) DmaSyncStartFd(fd);
+            }
+            ~ScopedDmaCpuAccess() {
+                if (active) DmaSyncEndFd(fd);
+            }
+        } sync(frame->dma_fd);
+
         if (frame->format != PixelFormat::RGB && frame->format != PixelFormat::BGR) {
             std::cerr << "[ai_face_recog] input must be RGB/BGR\n";
             return;
diff --git a/plugins/ai_yolo/ai_yolo_node.cpp b/plugins/ai_yolo/ai_yolo_node.cpp
index fb0871b..ac726be 100644
--- a/plugins/ai_yolo/ai_yolo_node.cpp
+++ b/plugins/ai_yolo/ai_yolo_node.cpp
@@ -11,6 +11,7 @@
 
 #include "ai_scheduler.h"
 #include "node.h"
+#include "utils/dma_alloc.h"
 #include "utils/logger.h"
 
 #if defined(RK3588_ENABLE_RKNN)
@@ -407,6 +408,17 @@ private:
     void RunInference(FramePtr frame) {
         if (!frame->data || frame->data_size == 0) return;
 
+        struct ScopedDmaCpuAccess {
+            int fd = -1;
+            bool active = false;
+            explicit ScopedDmaCpuAccess(int f) : fd(f), active(f >= 0) {
+                if (active) DmaSyncStartFd(fd);
+            }
+            ~ScopedDmaCpuAccess() {
+                if (active) DmaSyncEndFd(fd);
+            }
+        } sync(frame->dma_fd);
+
         bool is_rgb = (frame->format == PixelFormat::RGB || frame->format == PixelFormat::BGR);
         if (!is_rgb) {
             std::cerr << "[ai_yolo] input must be RGB/BGR, got other format\n";