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authorAlek Du <alek.du@intel.com>2010-06-04 11:47:55 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-11 01:35:35 +0400
commit48f24970144479c29b8cee6d2e1dbedf6dcf9cfb (patch)
tree5a4944c496f4209a862188c16f29cdef55db3224 /drivers/usb/host/ehci-hub.c
parentaa4d8342988d0c1a79ff19b2ede1e81dfbb16ea5 (diff)
downloadlinux-48f24970144479c29b8cee6d2e1dbedf6dcf9cfb.tar.xz
USB: EHCI: EHCI 1.1 addendum: Basic LPM feature support
With this patch, the LPM capable EHCI host controller can put device into L1 sleep state which is a mode that can enter/exit quickly, and reduce power consumption. Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com> Signed-off-by: Alek Du <alek.du@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-hub.c')
-rw-r--r--drivers/usb/host/ehci-hub.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index e7d3d8def282..8a28dae8a375 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -790,6 +790,11 @@ static int ehci_hub_control (
status_reg);
break;
case USB_PORT_FEAT_C_CONNECTION:
+ if (ehci->has_lpm) {
+ /* clear PORTSC bits on disconnect */
+ temp &= ~PORT_LPM;
+ temp &= ~PORT_DEV_ADDR;
+ }
ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
status_reg);
break;