diff --git a/sys/dev/usb/controller/dwc_otg.c b/sys/dev/usb/controller/dwc_otg.c
index 37b533325fd9..ea59ae6f880a 100644
--- a/sys/dev/usb/controller/dwc_otg.c
+++ b/sys/dev/usb/controller/dwc_otg.c
@@ -297,32 +297,29 @@ dwc_otg_init_fifo(struct dwc_otg_softc *sc, uint8_t mode)
 		if (x < sc->sc_dev_in_ep_max) {
 			uint32_t limit;
 
-			limit = (x == 1) ? DWC_OTG_MAX_TXN :
-			    (DWC_OTG_MAX_TXN / 2);
+			limit = (x == 1) ? MIN(DWC_OTG_TX_MAX_FIFO_SIZE,
+			    DWC_OTG_MAX_TXN) : MIN(DWC_OTG_MAX_TXN / 2,
+			    DWC_OTG_TX_MAX_FIFO_SIZE);
 
-			if (fifo_size >= limit) {
-				DWC_OTG_WRITE_4(sc, DOTG_DIEPTXF(x),
-				    ((limit / 4) << 16) |
-				    (tx_start / 4));
-				tx_start += limit;
-				fifo_size -= limit;
-				pf->usb.max_in_frame_size = 0x200;
-				pf->usb.support_in = 1;
+			/* see if there is enough FIFO space */
+			if (limit <= fifo_size) {
 				pf->max_buffer = limit;
-
-			} else if (fifo_size >= 0x80) {
-				DWC_OTG_WRITE_4(sc, DOTG_DIEPTXF(x),
-				    ((0x80 / 4) << 16) | (tx_start / 4));
-				tx_start += 0x80;
-				fifo_size -= 0x80;
-				pf->usb.max_in_frame_size = 0x40;
 				pf->usb.support_in = 1;
-
 			} else {
-				pf->usb.is_simplex = 1;
-				DWC_OTG_WRITE_4(sc, DOTG_DIEPTXF(x),
-				    (0x0 << 16) | (tx_start / 4));
+				limit = MIN(DWC_OTG_TX_MAX_FIFO_SIZE, 0x40);
+				if (limit <= fifo_size) {
+					pf->usb.support_in = 1;
+				} else {
+					pf->usb.is_simplex = 1;
+					limit = 0;
+				}
 			}
+			/* set FIFO size */
+			DWC_OTG_WRITE_4(sc, DOTG_DIEPTXF(x),
+			    ((limit / 4) << 16) | (tx_start / 4));
+			tx_start += limit;
+			fifo_size -= limit;
+			pf->usb.max_in_frame_size = limit;
 		} else {
 			pf->usb.is_simplex = 1;
 		}
diff --git a/sys/dev/usb/controller/dwc_otg.h b/sys/dev/usb/controller/dwc_otg.h
index 1fa1bbf67051..52b3b914a0db 100644
--- a/sys/dev/usb/controller/dwc_otg.h
+++ b/sys/dev/usb/controller/dwc_otg.h
@@ -38,6 +38,9 @@
 #define	DWC_OTG_SLOT_IDLE_MAX 3
 #define	DWC_OTG_SLOT_IDLE_MIN 2
 #define	DWC_OTG_NAK_MAX 8	/* 1 ms */
+#ifndef DWC_OTG_TX_MAX_FIFO_SIZE
+#define	DWC_OTG_TX_MAX_FIFO_SIZE DWC_OTG_MAX_TXN
+#endif
 
 #define	DWC_OTG_READ_4(sc, reg) \
   bus_space_read_4((sc)->sc_io_tag, (sc)->sc_io_hdl, reg)