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>
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index d43d176..a307d55 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -361,6 +361,22 @@
}
#endif
+static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int rc = 0;
+
+ if (!udev->parent) /* udev is root hub itself, impossible */
+ rc = -1;
+ /* we only support lpm device connected to root hub yet */
+ if (ehci->has_lpm && !udev->parent->parent) {
+ rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
+ if (!rc)
+ rc = ehci_lpm_check(ehci, udev->portnum);
+ }
+ return rc;
+}
+
static const struct hc_driver ehci_pci_hc_driver = {
.description = hcd_name,
.product_desc = "EHCI Host Controller",
@@ -407,6 +423,11 @@
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+ /*
+ * call back when device connected and addressed
+ */
+ .update_device = ehci_update_device,
+
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};