So far LS/FS devices directly attached to xHC root port can be successfully enumerated by xHCI driver, but if they are connected behind a hub, the enumeration process fails to address the device.
It turns out xHCI driver still misses a part that in the device's input slot context, all Transaction Translator (TT) related fields are not programmed. The xHCI spec defines how to enable TT.
Now LS/FS devices like USB keyboard/mouse can be enumerated behind a high speed hub.
Signed-off-by: Bin Meng bmeng.cn@gmail.com ---
drivers/usb/host/xhci-mem.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 03874db..bac2cee 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -771,6 +771,20 @@ void xhci_setup_addressable_virt_dev(struct xhci_ctrl *ctrl, BUG(); }
+#ifdef CONFIG_DM_USB + /* Set up TT fields to support FS/LS devices */ + if (speed == USB_SPEED_LOW || speed == USB_SPEED_FULL) { + dev = dev_get_parent_priv(udev->dev); + if (dev->speed == USB_SPEED_HIGH) { + hub = dev_get_uclass_priv(udev->dev); + if (hub->tt.multi) + slot_ctx->dev_info |= cpu_to_le32(DEV_MTT); + slot_ctx->tt_info |= cpu_to_le32(TT_PORT(udev->portnr)); + slot_ctx->tt_info |= cpu_to_le32(TT_SLOT(dev->slot_id)); + } + } +#endif + port_num = hop_portnr; debug("port_num = %d\n", port_num);