Author: thompsa
Date: Sun Feb 8 21:08:00 2009
New Revision: 188336
URL: http://svn.freebsd.org/changeset/base/188336
Log:
The NRL value in the queue head must be zero for interrupt transfers. This was
diagnosed using a USB analyser obtained through a FreeBSD Foundation grant.
Thanks to: FreeBSD Foundation
Modified:
head/sys/dev/usb2/controller/ehci2.c
Modified: head/sys/dev/usb2/controller/ehci2.c
==============================================================================
--- head/sys/dev/usb2/controller/ehci2.c Sun Feb 8 20:52:09 2009
(r188335)
+++ head/sys/dev/usb2/controller/ehci2.c Sun Feb 8 21:08:00 2009
(r188336)
@@ -1892,7 +1892,9 @@ ehci_setup_standard_chain(struct usb2_xf
if (usb2_get_speed(xfer->xroot->udev) == USB_SPEED_HIGH) {
qh_endp |= (EHCI_QH_SET_EPS(EHCI_QH_SPEED_HIGH) |
- EHCI_QH_DTC | EHCI_QH_SET_NRL(8));
+ EHCI_QH_DTC);
+ if (methods != &ehci_device_intr_methods)
+ qh_endp |= EHCI_QH_SET_NRL(8);
} else {
if (usb2_get_speed(xfer->xroot->udev) == USB_SPEED_FULL) {
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