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Force clearing of event ring interrupts. The "Intel Lynx Point" XHCI

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controller found in the MBP2013 has been observed to not work properly
unless this operation is performed.

MFC after:	1 week
Tested by:	Huang Wen Hui <huanghwh@gmail.com>
This commit is contained in:
Hans Petter Selasky 2014-01-11 08:10:01 +00:00
parent 5199761b66
commit 13156a5241
1 changed files with 7 additions and 0 deletions
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7
sys/dev/usb/controller/xhci.c
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@ -1578,6 +1578,7 @@ void
xhci_interrupt(struct xhci_softc *sc)
{
uint32_t status;
uint32_t temp;
USB_BUS_LOCK(&sc->sc_bus);
@ -1588,6 +1589,12 @@ xhci_interrupt(struct xhci_softc *sc)
XWRITE4(sc, oper, XHCI_USBSTS, status);
DPRINTFN(16, "real interrupt (status=0x%08x)\n", status);
temp = XREAD4(sc, runt, XHCI_IMAN(0));
/* force clearing of pending interrupts */
if (temp & XHCI_IMAN_INTR_PEND)
XWRITE4(sc, runt, XHCI_IMAN(0), temp);
/* check for event(s) */
xhci_interrupt_poll(sc);