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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-07-27 12:03:40 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-07-28 14:31:12 -0700
commit2d83109be62edd9647c45d7ed2b916b03974a7ec (patch)
tree77320544c5000b29b61140bde6fa6d1688171cc1 /drivers/usb/host
parent62889610f5591005bed9517360e17531684f72d0 (diff)
USB: xhci: Correct Event Handler Busy flag usage.
The Event Handler Busy bit in the event ring dequeue pointer is write 1 to clear. Fix the interrupt service routine to clear that bit after the event handler has run. xhci_set_hc_event_deq() is designed to update the event ring dequeue pointer without changing any of the four reserved bits in the lower nibble. The event handler busy (EHB) bit is write one to clear, so the new value must always contain a zero in that bit in order to preserve the EHB value. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/xhci-hcd.c4
-rw-r--r--drivers/usb/host/xhci-ring.c6
2 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
index e15773598e4..2e8e5bf6b6c 100644
--- a/drivers/usb/host/xhci-hcd.c
+++ b/drivers/usb/host/xhci-hcd.c
@@ -249,9 +249,9 @@ static void xhci_work(struct xhci_hcd *xhci)
/* FIXME this should be a delayed service routine that clears the EHB */
xhci_handle_event(xhci);
- /* Clear the event handler busy flag; the event ring should be empty. */
+ /* Clear the event handler busy flag (RW1C); the event ring should be empty. */
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
- xhci_write_64(xhci, temp_64 & ~ERST_EHB, &xhci->ir_set->erst_dequeue);
+ xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
/* Flush posted writes -- FIXME is this necessary? */
xhci_readl(xhci, &xhci->ir_set->irq_pending);
}
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 5dd3b1fd71c..fe9541a89a3 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -248,8 +248,12 @@ void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
/* Update HC event ring dequeue pointer */
temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
temp &= ERST_PTR_MASK;
+ /* Don't clear the EHB bit (which is RW1C) because
+ * there might be more events to service.
+ */
+ temp &= ~ERST_EHB;
if (!in_interrupt())
- xhci_dbg(xhci, "// Write event ring dequeue pointer\n");
+ xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n");
xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp,
&xhci->ir_set->erst_dequeue);
}