Author: thompsa
Date: Mon Jan 26 17:55:07 2009
New Revision: 187732
URL: http://svn.freebsd.org/changeset/base/187732
Log:
MFp4 //depot/projects/usb/ @156706
Adjust an UHCI portreset delay.
Submitted by: Hans Petter Selasky
Modified:
head/sys/dev/usb2/controller/uhci2.c
Modified: head/sys/dev/usb2/controller/uhci2.c
==============================================================================
--- head/sys/dev/usb2/controller/uhci2.c Mon Jan 26 17:50:20 2009
(r187731)
+++ head/sys/dev/usb2/controller/uhci2.c Mon Jan 26 17:55:07 2009
(r187732)
@@ -2431,12 +2431,16 @@ uhci_portreset(uhci_softc_t *sc, uint16_
x = URWMASK(UREAD2(sc, port));
UWRITE2(sc, port, x & ~UHCI_PORTSC_PR);
- if (use_polling) {
- /* polling */
- DELAY(1000);
- } else {
- usb2_pause_mtx(&sc->sc_bus.bus_mtx, 1);
- }
+
+ mtx_unlock(&sc->sc_bus.bus_mtx);
+
+ /*
+ * This delay needs to be exactly 100us, else some USB devices
+ * fail to attach!
+ */
+ DELAY(100);
+
+ mtx_lock(&sc->sc_bus.bus_mtx);
DPRINTFN(4, "uhci port %d reset, status1 = 0x%04x\n",
index, UREAD2(sc, port));
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