Commit 56175929 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Greg Kroah-Hartman
Browse files

usb: core: hub: Disable hub-initiated U1/U2 



If the device rejects the control transfer to enable device-initiated
U1/U2 entry, then the device will not initiate U1/U2 transition. To
improve the performance, the downstream port should not initate
transition to U1/U2 to avoid the delay from the device link command
response (no packet can be transmitted while waiting for a response from
the device). If the device has some quirks and does not implement U1/U2,
it may reject all the link state change requests, and the downstream
port may resend and flood the bus with more requests. This will affect
the device performance even further. This patch disables the
hub-initated U1/U2 if the device-initiated U1/U2 entry fails.

Reference: USB 3.2 spec 7.2.4.2.3

Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fea3af5e

drivers/usb/core/hub.c

+16 −12
Original line number Diff line number Diff line
@@ -3999,6 +3999,9 @@ static int usb_set_lpm_timeout(struct usb_device *udev, 
 * control transfers to set the hub timeout or enable device-initiated U1/U2

 * will be successful.

 *

 * If the control transfer to enable device-initiated U1/U2 entry fails, then

 * hub-initiated U1/U2 will be disabled.

 *

 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI

 * driver know about it.  If that call fails, it should be harmless, and just

 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
@@ -4053,23 +4056,24 @@ static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 
		 * host know that this link state won't be enabled.

		 */

		hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);

	} else {

		return;

	}



	/* Only a configured device will accept the Set Feature

	 * U1/U2_ENABLE

	 */

		if (udev->actconfig)

			usb_set_device_initiated_lpm(udev, state, true);



		/* As soon as usb_set_lpm_timeout(timeout) returns 0, the

		 * hub-initiated LPM is enabled. Thus, LPM is enabled no

		 * matter the result of usb_set_device_initiated_lpm().

		 * The only difference is whether device is able to initiate

		 * LPM.

		 */

	if (udev->actconfig &&

	    usb_set_device_initiated_lpm(udev, state, true) == 0) {

		if (state == USB3_LPM_U1)

			udev->usb3_lpm_u1_enabled = 1;

		else if (state == USB3_LPM_U2)

			udev->usb3_lpm_u2_enabled = 1;

	} else {

		/* Don't request U1/U2 entry if the device

		 * cannot transition to U1/U2.

		 */

		usb_set_lpm_timeout(udev, state, 0);

		hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);

	}

}

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