diff options
| author | Bin Meng | 2018-05-23 23:40:49 -0700 |
|---|---|---|
| committer | Marek Vasut | 2018-05-30 11:59:10 +0200 |
| commit | eaaefb066c86f08fb285e73fb8c5fbf497be6b57 (patch) | |
| tree | 18edc8551c644e2e79d98a65f179a2f0280ca1f4 /drivers | |
| parent | ae751b060e8cee3f9c48112898cd3e31ee6c0734 (diff) | |
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. In the case, we should
clear MTT to 0 for full speed hub according to section 6.2.2.
This keeps in sync with Linux kernel commit:
096b110: usb: xhci: fix config fail of FS hub behind a HS hub with MTT
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 8c1126e79dd..f9c6bbb9e98 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1435,8 +1435,15 @@ static int xhci_update_hub_device(struct udevice *dev, struct usb_device *udev) /* Update hub related fields */ slot_ctx->dev_info |= cpu_to_le32(DEV_HUB); - if (hub->tt.multi && udev->speed == USB_SPEED_HIGH) + /* + * 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 (hub->tt.multi) slot_ctx->dev_info |= cpu_to_le32(DEV_MTT); + else if (udev->speed == USB_SPEED_FULL) + slot_ctx->dev_info &= cpu_to_le32(~DEV_MTT); slot_ctx->dev_info2 |= cpu_to_le32(XHCI_MAX_PORTS(udev->maxchild)); /* * Set TT think time - convert from ns to FS bit times. |