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usb: xhci: Implement update_hub_device() operation

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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>
This commit is contained in:
Bin Meng 2017-07-19 21:51:19 +08:00 committed by Marek Vasut
parent 81060bb1c0
commit d228ca362b
1 changed files with 59 additions and 0 deletions
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59
drivers/usb/host/xhci.c
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@ -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