From e39b88e3e79f832ba4d52b3f4766772e148c8679 Mon Sep 17 00:00:00 2001
From: Vadim Galyant <vgal@rambler.ru>
Date: Fri, 1 Dec 2017 10:16:24 +0900
Subject: [PATCH] [USBPORT] Add USB2_GetPrevMicroFrame().

---
 drivers/usb/usbport/usb2.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/usb/usbport/usb2.c b/drivers/usb/usbport/usb2.c
index d8d5da9af19..a3c0d1449db 100644
--- a/drivers/usb/usbport/usb2.c
+++ b/drivers/usb/usbport/usb2.c
@@ -52,6 +52,19 @@ USB2_IncMicroFrame(OUT PUCHAR frame,
     }
 }
 
+VOID
+NTAPI
+USB2_GetPrevMicroFrame(OUT PUCHAR frame,
+                       OUT PUCHAR uframe)
+{
+    *uframe = USB2_MICROFRAMES - 1;
+
+    if (*frame)
+        --*frame;
+    else
+        *frame = USB2_FRAMES - 1;
+}
+
 BOOLEAN
 NTAPI
 USB2_CheckTtEndpointInsert(IN PUSB2_TT_ENDPOINT nextTtEndpoint,
-- 
2.17.1