diff --git a/bdk/soc/t210.h b/bdk/soc/t210.h
index 9ce7451..9cd7553 100644
--- a/bdk/soc/t210.h
+++ b/bdk/soc/t210.h
@@ -149,14 +149,31 @@
 
 /*! AHB Gizmo registers. */
 #define AHB_ARBITRATION_PRIORITY_CTRL 0x8
-#define  ARBITRATION_PRIORITY_CTRL_ENB_FAST_REARBITRATE (1 << 6)
+#define  PRIORITY_CTRL_WEIGHT(x) (((x) & 7) << 29)
+#define  PRIORITY_SELECT_USB BIT(6)
+#define  PRIORITY_SELECT_USB2 BIT(18)
+#define  PRIORITY_SELECT_USB3 BIT(17)
 #define AHB_GIZMO_AHB_MEM 0x10
 #define  AHB_MEM_ENB_FAST_REARBITRATE (1 << 2)
+#define  AHB_MEM_DONT_SPLIT_AHB_WR    (1 << 7)
+#define  AHB_MEM_IMMEDIATE            (1 << 18)
+#define AHB_GIZMO_APB_DMA 0x14
 #define AHB_GIZMO_USB 0x20
-#define  AHB_GIZMO_USB_IMMEDIATE (1 << 18)
+#define AHB_GIZMO_SDMMC4 0x48
+#define AHB_GIZMO_USB2 0x7C
+#define AHB_GIZMO_USB3 0x80
+#define  AHB_GIZMO_IMMEDIATE (1 << 18)
+#define AHB_AHB_MEM_PREFETCH_CFG3 0xE4
+#define AHB_AHB_MEM_PREFETCH_CFG4 0xE8
 #define AHB_AHB_MEM_PREFETCH_CFG1 0xF0
+#define AHB_AHB_MEM_PREFETCH_CFG2 0xF4
+#define  MST_ID(x) (((x) & 0x1F) << 26)
+#define  MEM_PREFETCH_AHBDMA_MST_ID MST_ID(5)
+#define  MEM_PREFETCH_USB_MST_ID MST_ID(6)
+#define  MEM_PREFETCH_USB2_MST_ID MST_ID(18)
+#define  MEM_PREFETCH_USB3_MST_ID MST_ID(17)
+#define  MEM_PREFETCH_ADDR_BNDRY(x) (((x) & 0xF) << 21)
 #define  MEM_PREFETCH_ENABLE (1 << 31)
-#define  MEM_PREFETCH_AHB_MST_USB 6
 
 /*! Misc registers. */
 #define APB_MISC_PP_STRAPPING_OPT_A 0x08
diff --git a/bdk/usb/usbd.c b/bdk/usb/usbd.c
index e1cdf24..cc97b64 100644
--- a/bdk/usb/usbd.c
+++ b/bdk/usb/usbd.c
@@ -361,11 +361,11 @@ int usb_device_init()
 	_usb_init_phy();
 
 	// AHB USB performance cfg.
-	AHB_GIZMO(AHB_GIZMO_AHB_MEM) |= AHB_MEM_ENB_FAST_REARBITRATE;
-	AHB_GIZMO(AHB_GIZMO_USB) |= AHB_GIZMO_USB_IMMEDIATE;
-	AHB_GIZMO(AHB_ARBITRATION_PRIORITY_CTRL) |= ARBITRATION_PRIORITY_CTRL_ENB_FAST_REARBITRATE;
+	AHB_GIZMO(AHB_GIZMO_AHB_MEM) |= AHB_MEM_DONT_SPLIT_AHB_WR | AHB_MEM_ENB_FAST_REARBITRATE;
+	AHB_GIZMO(AHB_GIZMO_USB) |= AHB_GIZMO_IMMEDIATE;
+	AHB_GIZMO(AHB_ARBITRATION_PRIORITY_CTRL) = PRIORITY_CTRL_WEIGHT(7) | PRIORITY_SELECT_USB;
 	AHB_GIZMO(AHB_AHB_MEM_PREFETCH_CFG1) =
-		MEM_PREFETCH_ENABLE | (MEM_PREFETCH_AHB_MST_USB << 26) | (12 << 21) | 0x1000; // addr boundary 64KB
+		MEM_PREFETCH_ENABLE | MEM_PREFETCH_USB_MST_ID | MEM_PREFETCH_ADDR_BNDRY(12) | 0x1000; // Addr boundary 64KB, Inactivity 4096 cycles.
 
 	// Set software and hardware context storage and clear it.
 	usbdaemon = (usbd_t *)USBD_ADDR; // Depends on USB_TD_BUFFER_PAGE_SIZE aligned address.