USB: EHCI: EHCI 1.1 addendum: Enable Per-port change detect bits

This patch will enable Per-port event feature defined in EHCI 1.1
addendum. This feature addresses an issue where HCD is currently
required to read and parse PORTSC for all enabled root hub ports. With
this patch, the overhead will be reduced.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 21f30a0c3d2f..e6c57cc416f6 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -141,6 +141,7 @@ struct ehci_hcd {			/* one per controller */
         __hc32                  *ohci_hcctrl_reg;
         unsigned                has_hostpc:1;
         unsigned                has_lpm:1;  /* support link power management */
+        unsigned                has_ppcd:1; /* support per-port change bits */
         u8                      sbrn;           /* packed release number */
 
         /* irq statistics */