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

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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>
This commit is contained in:
Alek Du
2010-06-04 15:47:56 +08:00
committed by Greg Kroah-Hartman
parent 48f2497014
commit 5a9cdf332e
3 changed files with 27 additions and 2 deletions
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1
drivers/usb/host/ehci.h
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@@ -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 */