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$NetBSD: patch-ag,v 1.5 2012/02/07 00:21:49 mef Exp $
Work around AVRISP mkII initial sync stalls on NetBSD.
--- usb_libusb.c.orig 2010-01-19 10:39:11.000000000 +0000
+++ usb_libusb.c
@@ -237,6 +237,17 @@ static void usbdev_close(union filedescr
{
usb_dev_handle *udev = (usb_dev_handle *)fd->usb.handle;
+#if defined(__NetBSD__)
+#define USB_FEAT_ENDPOINT_HALT 0
+ /*
+ * Clear Feature Endpoint Halt to reset device's data toggle to DATA0.
+ * This way, when we reopen expecting DATA0, things don't time out.
+ */
+ usb_control_msg(udev, USB_TYPE_STANDARD | USB_RECIP_ENDPOINT,
+ USB_REQ_CLEAR_FEATURE, USB_FEAT_ENDPOINT_HALT,
+ fd->usb.ep & 0xf, NULL, 0, 100);
+#endif
+
(void)usb_release_interface(udev, usb_interface);
#if !( defined(__FreeBSD__) ) // || ( defined(__APPLE__) && defined(__MACH__) ) )
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