[U-Boot] [RFC PATCH 0/2] USB: XHCI: Add xHCI host controller stack driver

[Marek Vasut <marex@denx.de>]

Dear Vivek Gautam,

> This change adds necessary framework support for
> USB3.0 (Super-speed) and xHCI host controller stack layer.
> This stack will eventually interact with SOC specific USB 3.0
> controllers.
> 
> Based on 'master' branch of u-boot tree.
> 
> Tested successfully with local patches on xHCI support for exynos5
> with Kingston USB 2.0 data traveler (512 MB) and Corsair USB 3.0
> flash voyager. However, also saw failures with Transcend USB 3.0 (8 GB)
> and a Jetflash 256 MB.
> We are further debugging and testing this thoroughly. In the meantime
> can this be reviewed please?
> This definitely needs further improvements ;-).

Sure, can you get me one such ARM hardware with xHCI? I'm sure you have a pile 
of them so you can miss one. That's help greatly, thanks!

> Although, code is based on linux's xHCI host controller driver,
> at certain points putting some delays seemed to make the device
> working (couldn't get proper explanation on delays in xHCI or
> USB 3.0 specifications :-(, any help in this regard will be
> very much appreciated).
> 
> Vivek Gautam (2):
>   USB: SS: Add support for Super Speed USB interface
>   USB: xHCI: Add stack support for xHCI
> 
>  common/cmd_usb.c         |    6 +-
>  common/usb.c             |   41 +-
>  common/usb_hub.c         |   26 +-
>  common/usb_storage.c     |   35 +-
>  drivers/usb/host/xhci.c  | 3330
> ++++++++++++++++++++++++++++++++++++++++++++++ drivers/usb/host/xhci.h  |
> 1360 +++++++++++++++++++
>  include/common.h         |    2 +
>  include/linux/usb/ch9.h  |    2 +-
>  include/usb.h            |   15 +-
>  include/usb_defs.h       |   26 +-
>  include/usbdescriptors.h |  201 +++
>  11 files changed, 5012 insertions(+), 32 deletions(-)
>  create mode 100644 drivers/usb/host/xhci.c
>  create mode 100644 drivers/usb/host/xhci.h

Best regards,
Marek Vasut