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

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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>
This commit is contained in:
Bin Meng 2017-07-19 21:51:21 +08:00 committed by Marek Vasut
parent 196ef8323c
commit 78e3098752
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/host/xhci-mem.c
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@ -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);