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>
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8fb7549..93720bdc 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2285,7 +2285,17 @@
}
/* 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);