1 files changed, 73 insertions, 0 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index bbab424b0d55..9eca403af2a8 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -44,6 +44,9 @@
 #define USB_PRODUCT_USB5534B			0x5534
 #define USB_VENDOR_CYPRESS			0x04b4
 #define USB_PRODUCT_CY7C65632			0x6570
+#define USB_VENDOR_TEXAS_INSTRUMENTS		0x0451
+#define USB_PRODUCT_TUSB8041_USB3		0x8140
+#define USB_PRODUCT_TUSB8041_USB2		0x8142
 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND	0x01
 #define HUB_QUIRK_DISABLE_AUTOSUSPEND		0x02
 
@@ -3081,6 +3084,48 @@ done:
 	return status;
 }
 
+/*
+ * hub_port_stop_enumerate - stop USB enumeration or ignore port events
+ * @hub: target hub
+ * @port1: port num of the port
+ * @retries: port retries number of hub_port_init()
+ *
+ * Return:
+ *    true: ignore port actions/events or give up connection attempts.
+ *    false: keep original behavior.
+ *
+ * This function will be based on retries to check whether the port which is
+ * marked with early_stop attribute would stop enumeration or ignore events.
+ *
+ * Note:
+ * This function didn't change anything if early_stop is not set, and it will
+ * prevent all connection attempts when early_stop is set and the attempts of
+ * the port are more than 1.
+ */
+static bool hub_port_stop_enumerate(struct usb_hub *hub, int port1, int retries)
+{
+	struct usb_port *port_dev = hub->ports[port1 - 1];
+
+	if (port_dev->early_stop) {
+		if (port_dev->ignore_event)
+			return true;
+
+		/*
+		 * We want unsuccessful attempts to fail quickly.
+		 * Since some devices may need one failure during
+		 * port initialization, we allow two tries but no
+		 * more.
+		 */
+		if (retries < 2)
+			return false;
+
+		port_dev->ignore_event = 1;
+	} else
+		port_dev->ignore_event = 0;
+
+	return port_dev->ignore_event;
+}
+
 /* Check if a port is power on */
 int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus)
 {
@@ -4796,6 +4841,11 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 	do_new_scheme = use_new_scheme(udev, retry_counter, port_dev);
 
 	for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) {
+		if (hub_port_stop_enumerate(hub, port1, retries)) {
+			retval = -ENODEV;
+			break;
+		}
+
 		if (do_new_scheme) {
 			struct usb_device_descriptor *buf;
 			int r = 0;
@@ -5246,6 +5296,11 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
 	status = 0;
 
 	for (i = 0; i < PORT_INIT_TRIES; i++) {
+		if (hub_port_stop_enumerate(hub, port1, i)) {
+			status = -ENODEV;
+			break;
+		}
+
 		usb_lock_port(port_dev);
 		mutex_lock(hcd->address0_mutex);
 		retry_locked = true;
@@ -5614,6 +5669,10 @@ static void port_event(struct usb_hub *hub, int port1)
 	if (!pm_runtime_active(&port_dev->dev))
 		return;
 
+	/* skip port actions if ignore_event and early_stop are true */
+	if (port_dev->ignore_event && port_dev->early_stop)
+		return;
+
 	if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange))
 		connect_change = 1;
 
@@ -5798,6 +5857,16 @@ static const struct usb_device_id hub_id_table[] = {
       .idVendor = USB_VENDOR_GENESYS_LOGIC,
       .bInterfaceClass = USB_CLASS_HUB,
       .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
+    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+			| USB_DEVICE_ID_MATCH_PRODUCT,
+      .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+      .idProduct = USB_PRODUCT_TUSB8041_USB2,
+      .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+			| USB_DEVICE_ID_MATCH_PRODUCT,
+      .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+      .idProduct = USB_PRODUCT_TUSB8041_USB3,
+      .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
       .bDeviceClass = USB_CLASS_HUB},
     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
@@ -5927,6 +5996,10 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
 	mutex_lock(hcd->address0_mutex);
 
 	for (i = 0; i < PORT_INIT_TRIES; ++i) {
+		if (hub_port_stop_enumerate(parent_hub, port1, i)) {
+			ret = -ENODEV;
+			break;
+		}
 
 		/* ep0 maxpacket size may change; let the HCD know about it.
 		 * Other endpoints will be handled by re-enumeration. */