USB: use "global suspend" for system sleep on USB-2 buses

This patch (as1674) speeds up system sleep transitions by not
suspending each individual device on a USB-1.1 or USB-2 bus.  The
devices will automatically go into suspend when their root hubs are
suspended (i.e., stop sending out Start-Of-Frame packets) -- this is
what the USB spec calls "global suspend".

Since this is what we do already when CONFIG_USB_SUSPEND isn't
enabled, it shouldn't cause any problems.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 21 insertions, 6 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 669da9ef714d..443d5cc9330b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2886,9 +2886,11 @@ static int usb_disable_function_remotewakeup(struct usb_device *udev)
  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
  * timer, no SRP, no requests through sysfs.
  *
- * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
- * the root hub for their bus goes into global suspend ... so we don't
- * (falsely) update the device power state to say it suspended.
+ * If CONFIG_USB_SUSPEND isn't enabled, non-SuperSpeed devices really get
+ * suspended only when their bus goes into global suspend (i.e., the root
+ * hub is suspended).  Nevertheless, we change @udev->state to
+ * USB_STATE_SUSPENDED as this is the device's "logical" state.  The actual
+ * upstream port setting is stored in @udev->port_is_suspended.
  *
  * Returns 0 on success, else negative errno.
  */
@@ -2899,6 +2901,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
         enum pm_qos_flags_status pm_qos_stat;
         int             port1 = udev->portnum;
         int             status;
+        bool            really_suspend = true;
 
         /* enable remote wakeup when appropriate; this lets the device
          * wake up the upstream hub (including maybe the root hub).
@@ -2955,9 +2958,19 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
         /* see 7.1.7.6 */
         if (hub_is_superspeed(hub->hdev))
                 status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3);
-        else
+        else if (PMSG_IS_AUTO(msg))
                 status = set_port_feature(hub->hdev, port1,
                                                 USB_PORT_FEAT_SUSPEND);
+        /*
+         * For system suspend, we do not need to enable the suspend feature
+         * on individual USB-2 ports.  The devices will automatically go
+         * into suspend a few ms after the root hub stops sending packets.
+         * The USB 2.0 spec calls this "global suspend".
+         */
+        else {
+                really_suspend = false;
+                status = 0;
+        }
         if (status) {
                 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
                                 port1, status);
@@ -2993,8 +3006,10 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
                                 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
                                 udev->do_remote_wakeup);
                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
-                udev->port_is_suspended = 1;
-                msleep(10);
+                if (really_suspend) {
+                        udev->port_is_suspended = 1;
+                        msleep(10);
+                }
         }
 
         /*