diff options
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 6864759c8d1a..3abf33223b1c 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -2699,11 +2699,16 @@ int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev, /* Set TT think time - convert from ns to FS bit times. * 0 = 8 FS bit times, 1 = 16 FS bit times, * 2 = 24 FS bit times, 3 = 32 FS bit times. + * + * xHCI 1.0: this field shall be 0 if the device is not a + * High-spped hub. */ think_time = tt->think_time; if (think_time != 0) think_time = (think_time / 666) - 1; - slot_ctx->tt_info |= cpu_to_le32(TT_THINK_TIME(think_time)); + if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH) + slot_ctx->tt_info |= + cpu_to_le32(TT_THINK_TIME(think_time)); } else { xhci_dbg(xhci, "xHCI version %x doesn't need hub " "TT think time or number of ports\n", |