From aa1b13efb7cfa9f7bf4942c1e858463e335c9500 Mon Sep 17 00:00:00 2001
From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Date: Thu, 3 Mar 2011 05:40:51 -0800
Subject: [PATCH] xhci: Modify check for TT info.
Commit d199c96d by Alan Stern ensured that low speed and full speed
devices below a high speed hub without a transaction translator (TT) would
never get enumerated. Simplify the check for a TT in the xHCI virtual
device allocation to only check if the usb_device references a parent's
TT.
Make sure not to set the TT information on LS/FS devices directly
connected to the roothub. The xHCI host doesn't really have a TT, and the
host will throw an error when those virtual device TT fields are set for a
device connected to the roothub. We need this check because the xHCI
driver will shortly register two roothubs: a USB 2.0 roothub and a USB 3.0
roothub.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
---
drivers/usb/host/xhci-mem.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index e3e6410d7b5e..9688a58611d4 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -870,9 +870,8 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud
dev->port = top_dev->portnum;
xhci_dbg(xhci, "Set root hub portnum to %d\n", top_dev->portnum);
- /* Is this a LS/FS device under a HS hub? */
- if ((udev->speed == USB_SPEED_LOW || udev->speed == USB_SPEED_FULL) &&
- udev->tt) {
+ /* Is this a LS/FS device under an external HS hub? */
+ if (udev->tt && udev->tt->hub->parent) {
slot_ctx->tt_info = udev->tt->hub->slot_id;
slot_ctx->tt_info |= udev->ttport << 8;
if (udev->tt->multi)
--
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