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| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2015-12-04 15:53:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-28 21:57:08 -0800 |
| commit | a04cbd474cd7470a4fbdd4db52e60c06128b67b2 (patch) | |
| tree | 29247c7cb14fbb317b8b19d7dad81275875ab04f | |
| parent | cb96901fa07cbe5b52cdd234123ceba0c0149abe (diff) | |
| download | linux-stable-a04cbd474cd7470a4fbdd4db52e60c06128b67b2.tar.gz linux-stable-a04cbd474cd7470a4fbdd4db52e60c06128b67b2.tar.bz2 linux-stable-a04cbd474cd7470a4fbdd4db52e60c06128b67b2.zip | |
usb: xhci: fix config fail of FS hub behind a HS hub with MTT
commit 096b110a3dd3c868e4610937c80d2e3f3357c1a9 upstream.
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>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/xhci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 79c7b255e60a..596eccc1f6a8 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4696,8 +4696,16 @@ 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", |