usb: xhci: Implement update_hub_device() operation

There is no way to know whether the attached device is a hub or
not in advance before the device's descriptor is fetched. But
once we know it's a high speed hub, per the xHCI spec, we need
to tell xHC it's a hub device by initializing hub-related fields
in the input slot context.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 336613f73cde5b95e7af315cdc92d81287aa8536..9b82ee5c602782a10876fbdd3995e5bd71be1495 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1170,6 +1170,64 @@ static int xhci_alloc_device(struct udevice *dev, struct usb_device *udev)
        return _xhci_alloc_device(udev);
 }
 
+static int xhci_update_hub_device(struct udevice *dev, struct usb_device *udev)
+{
+       struct xhci_ctrl *ctrl = dev_get_priv(dev);
+       struct usb_hub_device *hub = dev_get_uclass_priv(udev->dev);
+       struct xhci_virt_device *virt_dev;
+       struct xhci_input_control_ctx *ctrl_ctx;
+       struct xhci_container_ctx *out_ctx;
+       struct xhci_container_ctx *in_ctx;
+       struct xhci_slot_ctx *slot_ctx;
+       int slot_id = udev->slot_id;
+       unsigned think_time;
+
+       debug("%s: dev='%s', udev=%p\n", __func__, dev->name, udev);
+
+       /* Ignore root hubs */
+       if (usb_hub_is_root_hub(udev->dev))
+               return 0;
+
+       virt_dev = ctrl->devs[slot_id];
+       BUG_ON(!virt_dev);
+
+       out_ctx = virt_dev->out_ctx;
+       in_ctx = virt_dev->in_ctx;
+
+       ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
+       /* Initialize the input context control */
+       ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
+       ctrl_ctx->drop_flags = 0;
+
+       xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
+
+       /* slot context */
+       xhci_slot_copy(ctrl, in_ctx, out_ctx);
+       slot_ctx = xhci_get_slot_ctx(ctrl, in_ctx);
+
+       /* Update hub related fields */
+       slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
+       if (hub->tt.multi && udev->speed == USB_SPEED_HIGH)
+               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.
+        * Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns
+        *
+        * 0 =  8 FS bit times, 1 = 16 FS bit times,
+        * 2 = 24 FS bit times, 3 = 32 FS bit times.
+        *
+        * This field shall be 0 if the device is not a high-spped hub.
+        */
+       think_time = hub->tt.think_time;
+       if (think_time != 0)
+               think_time = (think_time / 666) - 1;
+       if (udev->speed == USB_SPEED_HIGH)
+               slot_ctx->tt_info |= cpu_to_le32(TT_THINK_TIME(think_time));
+
+       return xhci_configure_endpoints(udev, false);
+}
+
 int xhci_register(struct udevice *dev, struct xhci_hccr *hccr,
                  struct xhci_hcor *hcor)
 {
@@ -1222,6 +1280,7 @@ struct dm_usb_ops xhci_usb_ops = {
        .bulk = xhci_submit_bulk_msg,
        .interrupt = xhci_submit_int_msg,
        .alloc_device = xhci_alloc_device,
+       .update_hub_device = xhci_update_hub_device,
 };
 
 #endif