4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit e86108940e541febf35813402ff29fa6f4a9ac0b ]
When initializing a hub we want to give a USB3 port in link training the same debounce delay time before autosuspening the hub as already trained, connected enabled ports.
USB3 ports won't reach the enabled state with "current connect status" and "connect status change" bits set until the USB3 link training finishes.
Catching the port in link training (polling) and adding the debounce delay prevents unnecessary failed attempts to autosuspend the hub.
Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Acked-by: Alan Stern stern@rowland.harvard.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/core/hub.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f76b2e0aba9d..1d1e61e980f3 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1112,6 +1112,16 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) USB_PORT_FEAT_ENABLE); }
+ /* + * Add debounce if USB3 link is in polling/link training state. + * Link will automatically transition to Enabled state after + * link training completes. + */ + if (hub_is_superspeed(hdev) && + ((portstatus & USB_PORT_STAT_LINK_STATE) == + USB_SS_PORT_LS_POLLING)) + need_debounce_delay = true; + /* Clear status-change flags; we'll debounce later */ if (portchange & USB_PORT_STAT_C_CONNECTION) { need_debounce_delay = true;