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| author | Alek Du <alek.du@intel.com> | 2010-06-04 15:47:55 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:35 -0700 |
| commit | 48f24970144479c29b8cee6d2e1dbedf6dcf9cfb (patch) | |
| tree | 5a4944c496f4209a862188c16f29cdef55db3224 /drivers/usb/host/ehci-hub.c | |
| parent | aa4d8342988d0c1a79ff19b2ede1e81dfbb16ea5 (diff) | |
| download | linux-48f24970144479c29b8cee6d2e1dbedf6dcf9cfb.tar.gz linux-48f24970144479c29b8cee6d2e1dbedf6dcf9cfb.tar.bz2 linux-48f24970144479c29b8cee6d2e1dbedf6dcf9cfb.zip | |
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.c | 5 |
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; |