[U-Boot] [PATCH 00/20] usb: xhci: Fix USB xHCI support on Intel platform

[Marek Vasut]

On 06/16/2017 03:31 PM, Bin Meng wrote:
> Currently U-Boot xHCI driver does not work on Intel BayTrail SoC based
> boards that have USB 3.0 ports. Trying to do a 'usb start' simply hangs
> the board. This series fixes a bunch of xHCI driver issues to make it
> work on Intel's platform.
> 
> Issues identified in the U-Boot xHCI driver are really spec violations,
> but apparently other xHCI IPs found on ARM SoCs (mainly Synopsis IP?)
> are quite tolerant with these spec violations, or IOW those IPs don't
> respect the xHCI spec. While it comes to Intel platform, it just breaks.
> 
> Note xHCI interrupt transfer is still not supported in this series, as
> it has been there since the original commit of xHCI support for years.
> 
> Tested on Intel MinnowMax board with the following USB devices:
> - Dell USB 1.1 keyboard
> - Dell USB 2.0 mouse
> - Netac USB 2.0 flash disk
> - JetFlash USB 3.0 flash disk
> - GenesysLogic 4-port USB 3.0 hub, with an integrated Realtek USB
>   ethernet chipset connected to one of its downstream port
> 
> Testing were performed on both ports (2.0 port and 3.0 port), and both
> ports are connected to xHCI (configure MinnowMax to enable xHCI).
> 
> Testing results:
> - DELL USB 1.1 keyboard and 2.0 mouse can be enumerated on both ports
> - USB 2.0 and 3.0 flash disks work fine (enumerated, read/write) on
>   both ports
> - GenesysLogic USB 3.0 hub can be enumerated on 2.0 port as a 2.0 hub,
>   and the integrated Realtek USB ethernet chipset enumerated as well.
>   USB 2.0 and 3.0 flash disks connected via the hub can be enumerated,
>   but DELL USB 1.1 keyboard and 2.0 mouse cannot.
> - GenesysLogic USB 3.0 hub can be enumerated on 3.0 port as a 3.0 hub,
>   but the integrated Realtek USB ethernet chipset cannot be enumerated.
>   None of devices connected via the hub can be enumerated. U-Boot xHCI
>   driver just throws BUG_ON() on the event TRB handling.
> 
> This indicates that USB 3.0 hub support in U-Boot is seriously broken.
> So far this series tries to fix some of the issues identified, but the
> USB 3.0 hub is still not working. This will be left as future work, or
> if someone else is interested it to pick up the work.
> 
> The USB 3.0 hub work includes: port status translation, USB 3.0 newly
> added "Set Hub Depth" request support, xHCI codes update to fill in
> hub description fields in the input slot context when issuing commands
> to xHC, etc.
> 

I'd like Stefan to review this series as he worked on the intel stuff
recently too.

-- 
Best regards,
Marek Vasut