Author: hselasky
Date: Tue Jan 8 19:38:57 2013
New Revision: 245175
URL: http://svnweb.freebsd.org/changeset/base/245175
Log:
Shave off another register write to save some more
microseconds of PCI access time.
Tested by: sos @
Submitted by: sos @
MFC after: 1 week
Modified:
head/sys/dev/usb/controller/xhci.c
Modified: head/sys/dev/usb/controller/xhci.c
==============================================================================
--- head/sys/dev/usb/controller/xhci.c Tue Jan 8 19:16:28 2013
(r245174)
+++ head/sys/dev/usb/controller/xhci.c Tue Jan 8 19:38:57 2013
(r245175)
@@ -1440,24 +1440,33 @@ void
xhci_interrupt(struct xhci_softc *sc)
{
uint32_t status;
- uint32_t temp;
+ uint32_t iman;
USB_BUS_LOCK(&sc->sc_bus);
status = XREAD4(sc, oper, XHCI_USBSTS);
+ if (status == 0)
+ goto done;
/* acknowledge interrupts */
XWRITE4(sc, oper, XHCI_USBSTS, status);
- temp = XREAD4(sc, runt, XHCI_IMAN(0));
-
- /* acknowledge pending event */
-
- XWRITE4(sc, runt, XHCI_IMAN(0), temp);
-
- DPRINTFN(16, "real interrupt (sts=0x%08x, "
- "iman=0x%08x)\n", status, temp);
+ DPRINTFN(16, "real interrupt (status=0x%08x)\n", status);
+
+ if (status & XHCI_STS_EINT) {
+
+ /* acknowledge pending event */
+ iman = XREAD4(sc, runt, XHCI_IMAN(0));
+
+ /* reset interrupt */
+ XWRITE4(sc, runt, XHCI_IMAN(0), iman);
+
+ DPRINTFN(16, "real interrupt (iman=0x%08x)\n", iman);
+
+ /* check for event(s) */
+ xhci_interrupt_poll(sc);
+ }
if (status & (XHCI_STS_PCD | XHCI_STS_HCH |
XHCI_STS_HSE | XHCI_STS_HCE)) {
@@ -1481,11 +1490,7 @@ xhci_interrupt(struct xhci_softc *sc)
__FUNCTION__);
}
}
-
- /* check if we need to check the event rings */
- if ((status != 0) || (temp & XHCI_IMAN_INTR_PEND))
- xhci_interrupt_poll(sc);
-
+done:
USB_BUS_UNLOCK(&sc->sc_bus);
}
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