svn commit: r255356 - head/sys/dev/usb/controller

[Hans Petter Selasky]

Author: hselasky
Date: Sat Sep  7 10:42:00 2013
New Revision: 255356
URL: http://svnweb.freebsd.org/changeset/base/255356

Log:
  Revert parts of r245132 and r245175. We don't need to write to the
  IMAN register to clear the pending interrupt status bits. This patch
  tries to solve problems seen on the MacBook Air, as reported by
  Johannes Lundberg <johannes at brilliantservice.co.jp>
  
  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	Sat Sep  7 09:47:18 2013	(r255355)
+++ head/sys/dev/usb/controller/xhci.c	Sat Sep  7 10:42:00 2013	(r255356)
@@ -1480,7 +1480,6 @@ void
 xhci_interrupt(struct xhci_softc *sc)
 {
 	uint32_t status;
-	uint32_t iman;
 
 	USB_BUS_LOCK(&sc->sc_bus);
 
@@ -1495,15 +1494,6 @@ xhci_interrupt(struct xhci_softc *sc)
 	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);
 	}