USB3 devices connected behind several external suspended hubs may not be detected when plugged in due to aggressive hub runtime pm suspend.

The hub driver immediately runtime-suspends hubs if there are no active children or port activity.

There is a delay between the wake signal causing hub resume, and driver visible port activity on the hub downstream facing ports. Most of the LFPS handshake, resume signaling and link training done on the downstream ports is not visible to the hub driver until completed, when device then will appear fully enabled and running on the port.

This delay between wake signal and detectable port change is even more significant with chained suspended hubs where the wake signal will propagate upstream first. Suspended hubs will only start resuming downstream ports after upstream facing port resumes.

The hub driver may resume a USB3 hub, read status of all ports, not yet see any activity, and runtime suspend back the hub before any port activity is visible.

This exact case was seen when conncting USB3 devices to a suspended Thunderbolt dock.

USB3 specification defines a 100ms tU3WakeupRetryDelay, indicating USB3 devices expect to be resumed within 100ms after signaling wake. if not then device will resend the wake signal.

Give the USB3 hubs twice this time (200ms) to detect any port changes after resume, before allowing hub to runtime suspend again.

Cc: stable@vger.kernel.org Fixes: 2839f5bcfcfc ("USB: Turn on auto-suspend for USB 3.0 hubs.") Acked-by: Alan Stern stern@rowland.harvard.edu Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com --- v2 changes - Update commit in Fixes tag - Add Ack from Alan Stern

drivers/usb/core/hub.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 770d1e91183c..5c12dfdef569 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -68,6 +68,12 @@ */ #define USB_SHORT_SET_ADDRESS_REQ_TIMEOUT 500 /* ms */

+/* + * Give SS hubs 200ms time after wake to train downstream links before + * assuming no port activity and allowing hub to runtime suspend back. + */ +#define USB_SS_PORT_U0_WAKE_TIME 200 /* ms */ + /* Protect struct usb_device->state and ->children members * Note: Both are also protected by ->dev.sem, except that ->state can * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ @@ -1068,11 +1074,12 @@ int usb_remove_device(struct usb_device *udev)

enum hub_activation_type { HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ - HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, + HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, HUB_POST_RESUME, };

static void hub_init_func2(struct work_struct *ws); static void hub_init_func3(struct work_struct *ws); +static void hub_post_resume(struct work_struct *ws);

static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) { @@ -1095,6 +1102,13 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) goto init2; goto init3; } + + if (type == HUB_POST_RESUME) { + usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); + hub_put(hub); + return; + } + hub_get(hub);

/* The superspeed hub except for root hub has to use Hub Depth @@ -1343,6 +1357,16 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) device_unlock(&hdev->dev); }

+ if (type == HUB_RESUME && hub_is_superspeed(hub->hdev)) { + /* give usb3 downstream links training time after hub resume */ + INIT_DELAYED_WORK(&hub->init_work, hub_post_resume); + queue_delayed_work(system_power_efficient_wq, &hub->init_work, + msecs_to_jiffies(USB_SS_PORT_U0_WAKE_TIME)); + usb_autopm_get_interface_no_resume( + to_usb_interface(hub->intfdev)); + return; + } + hub_put(hub); }

@@ -1361,6 +1385,13 @@ static void hub_init_func3(struct work_struct *ws) hub_activate(hub, HUB_INIT3); }

+static void hub_post_resume(struct work_struct *ws) +{ + struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); + + hub_activate(hub, HUB_POST_RESUME); +} + enum hub_quiescing_type { HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND };