[U-Boot] [PATCH] usb: Move determination of TT hub address/port into seperate function

[Marek Vasut <marex@denx.de>]

On Friday, December 18, 2015 at 02:11:41 AM, Stefan Br?ns wrote:
> Start split and complete split tokens need the hub address and the
> downstream port of the first HS hub (device view).
> 
> The core of the function was duplicated in both host/ehci_hcd and
> musb-new/usb-compat.h.
> 
> Signed-off-by: Stefan Br?ns <stefan.bruens@rwth-aachen.de>
> ---
> Obsoletes [PATCH 3/6] usb: dwc2: determine TT hub address and port for
> split transactions
> 
>  common/usb.c                      | 54
> +++++++++++++++++++++++++++++++++++++++ drivers/usb/host/ehci-hcd.c      
> | 50 ++++-------------------------------- drivers/usb/musb-new/musb_host.c
>  |  8 +++---
>  drivers/usb/musb-new/usb-compat.h | 53
> -------------------------------------- include/usb.h                     |
> 10 ++++++++
>  5 files changed, 74 insertions(+), 101 deletions(-)
> 
> diff --git a/common/usb.c b/common/usb.c
> index 700bfc3..1d0a151 100644
> --- a/common/usb.c
> +++ b/common/usb.c
> @@ -1200,4 +1200,58 @@ bool usb_device_has_child_on_port(struct usb_device
> *parent, int port) #endif
>  }
> 
> +#ifdef CONFIG_DM_USB
> +void usb_find_hub_address_port(struct usb_device *udev,
> +			       uint8_t *hub_address, uint8_t *hub_port)
> +{
> +	struct udevice *parent;
> +	struct usb_device *uparent, *ttdev;
> +
> +	/*
> +	 * When called from usb-uclass.c: usb_scan_device() udev->dev points
> +	 * to the parent udevice, not the actual udevice belonging to the
> +	 * udev as the device is not instantiated yet. So when searching
> +	 * for the first usb-2 parent start with udev->dev not
> +	 * udev->dev->parent .
> +	 */
> +	ttdev = udev;
> +	parent = udev->dev;
> +	uparent = dev_get_parent_priv(parent);
> +
> +	while (uparent->speed != USB_SPEED_HIGH) {
> +		struct udevice *dev = parent;
> +
> +		if (device_get_uclass_id(dev->parent) != UCLASS_USB_HUB) {
> +			printf("Error: Cannot find high speed parent of usb-1 
device\n");
> +			*hub_address = *hub_port = 0;

Please avoid this construct: foo = bar = 1234; , it's really confusing and error 
prone.

Otherwise looks good!

Reviewed-by: Marek Vasut <marex@denx.de>