? sys/external/bsd/dwc2/cscope.out
Index: sys/external/bsd/dwc2/dist/dwc2_hcdintr.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/dwc2/dist/dwc2_hcdintr.c,v
retrieving revision 1.14
diff -u -p -r1.14 dwc2_hcdintr.c
--- sys/external/bsd/dwc2/dist/dwc2_hcdintr.c	8 Aug 2018 07:20:44 -0000	1.14
+++ sys/external/bsd/dwc2/dist/dwc2_hcdintr.c	11 Aug 2018 09:07:22 -0000
@@ -67,6 +67,9 @@ __KERNEL_RCSID(0, "$NetBSD: dwc2_hcdintr
 #define DWC2_NAKS_BEFORE_DELAY		3
 int dwc2_naks_before_delay = DWC2_NAKS_BEFORE_DELAY;
 
+#define DWC2_OUT_NAKS_BEFORE_DELAY	1
+int dwc2_out_naks_before_delay = DWC2_OUT_NAKS_BEFORE_DELAY;
+
 /* This function is for debug only */
 static void dwc2_track_missed_sofs(struct dwc2_hsotg *hsotg)
 {
@@ -1320,8 +1323,10 @@ static void dwc2_hc_nak_intr(struct dwc2
 			/*
 			 * Avoid interrupt storms.
 			 */
-			qtd->qh->want_wait = 1;
-		} else if (!chan->qh->ping_state) {
+			qtd->num_naks++;
+			qtd->qh->want_wait = qtd->num_naks >= dwc2_out_naks_before_delay;
+		}
+		if (!chan->qh->ping_state) {
 			dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb,
 						  qtd, DWC2_HC_XFER_NAK);
 			dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);