USB: OHCI: disable RHSC inside interrupt handler

[pandora-kernel.git] / drivers / usb / host / ohci-hcd.c

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index ea4714e..a95275a 100644 (file)
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -729,6 +729,16 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
                ohci->next_statechange = jiffies + STATECHANGE_DELAY;
                ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
                                &regs->intrstatus);
+
+               /* NOTE: Vendors didn't always make the same implementation
+                * choices for RHSC.  Many followed the spec; RHSC triggers
+                * on an edge, like setting and maybe clearing a port status
+                * change bit.  With others it's level-triggered, active
+                * until khubd clears all the port status change bits.  We'll
+                * always disable it here and rely on polling until khubd
+                * re-enables it.
+                */
+               ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
                usb_hcd_poll_rh_status(hcd);
        }