diff options
Diffstat (limited to 'drivers/usb/core/port.c')
| -rw-r--r-- | drivers/usb/core/port.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index fe1b6d0967e..cd3f9dc24a0 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -103,16 +103,19 @@ static int usb_port_runtime_resume(struct device *dev) msleep(hub_power_on_good_delay(hub)); if (udev && !retval) { /* - * Attempt to wait for usb hub port to be reconnected in order - * to make the resume procedure successful. The device may have - * disconnected while the port was powered off, so ignore the - * return status. + * Our preference is to simply wait for the port to reconnect, + * as that is the lowest latency method to restart the port. + * However, there are cases where toggling port power results in + * the host port and the device port getting out of sync causing + * a link training live lock. Upon timeout, flag the port as + * needing warm reset recovery (to be performed later by + * usb_port_resume() as requested via usb_wakeup_notification()) */ - retval = hub_port_debounce_be_connected(hub, port1); - if (retval < 0) - dev_dbg(&port_dev->dev, "can't get reconnection after setting port power on, status %d\n", - retval); - retval = 0; + if (hub_port_debounce_be_connected(hub, port1) < 0) { + dev_dbg(&port_dev->dev, "reconnect timeout\n"); + if (hub_is_superspeed(hdev)) + set_bit(port1, hub->warm_reset_bits); + } /* Force the child awake to revalidate after the power loss. */ if (!test_and_set_bit(port1, hub->child_usage_bits)) { |