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usbcore: Bug fix: system can't suspend with USB3.0 device connected to USB3.0 hub 

This patch clear PORT_POWER when suspend a USB3.0 device behind a USB3.0
external hub, so the system can suspend and resume.

Note USB3.0 device may not work after system resume and this is a temporary
workaround. The correct fix will be in future patches.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Andiry Xu 2011-03-31 14:56:50 +08:00 committed by Sarah Sharp
parent b214f191d9
commit a8f08d86db
1 changed files with 11 additions and 1 deletions
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12
drivers/usb/core/hub.c
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@ -2285,7 +2285,17 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
}
/* see 7.1.7.6 */
status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
/* Clear PORT_POWER if it's a USB3.0 device connected to USB 3.0
* external hub.
* FIXME: this is a temporary workaround to make the system able
* to suspend/resume.
*/
if ((hub->hdev->parent != NULL) && hub_is_superspeed(hub->hdev))
status = clear_port_feature(hub->hdev, port1,
USB_PORT_FEAT_POWER);
else
status = set_port_feature(hub->hdev, port1,
USB_PORT_FEAT_SUSPEND);
if (status) {
dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
port1, status);