[U-Boot] [PATCH v2 15/15] usb: xhci: Enable TT to support LS/FS devices behind a HS hub

[Bin Meng]

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 at gmail.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---

Changes in v2: None

 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 bfbbb75..3931149 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -781,6 +781,20 @@ 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);
 
-- 
2.9.2