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The NRL value in the queue head must be zero for interrupt transfers. This was

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diagnosed using a USB analyser obtained through a FreeBSD Foundation grant.

Thanks to:	FreeBSD Foundation
This commit is contained in:
Andrew Thompson 2009-02-08 21:08:00 +00:00
parent b0994946c7
commit 0ac54a56b8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=188336
1 changed files with 3 additions and 1 deletions
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4
sys/dev/usb2/controller/ehci2.c
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@ -1892,7 +1892,9 @@ ehci_setup_standard_chain(struct usb2_xfer *xfer, ehci_qh_t **qh_last)
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) {