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usb: xhci: fix config fail of FS hub behind a HS hub with MTT 

if a full speed hub connects to a high speed hub which
supports MTT, the MTT field of its slot context will be set
to 1 when xHCI driver setups an xHCI virtual device in
xhci_setup_addressable_virt_dev(); once usb core fetch its
hub descriptor, and need to update the xHC's internal data
structures for the device, the HUB field of its slot context
will be set to 1 too, meanwhile MTT is also set before,
this will cause configure endpoint command fail, so in the
case, we should clear MTT to 0 for full speed hub according
to section 6.2.2

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2015-12-04 15:53:43 +02:00 committed by Greg Kroah-Hartman
parent 84ed91526f
commit 096b110a3d
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/host/xhci.c
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@ -4778,8 +4778,16 @@ int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
/*
* refer to section 6.2.2: MTT should be 0 for full speed hub,
* but it may be already set to 1 when setup an xHCI virtual
* device, so clear it anyway.
*/
if (tt->multi)
slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
else if (hdev->speed == USB_SPEED_FULL)
slot_ctx->dev_info &= cpu_to_le32(~DEV_MTT);
if (xhci->hci_version > 0x95) {
xhci_dbg(xhci, "xHCI version %x needs hub "
"TT think time and number of ports\n",