usb: xhci: Enable TT to support LS/FS devices behind a HS hub

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>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c02059ee0ab79338a6dd1a5f2301e539f91e4452..d5eab3a61545442ae31066e85b4584946bbdf54d 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -783,6 +783,20 @@ 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);