[U-Boot] xHCI on x86

[Simon Glass]

Hi,

On 13 July 2016 at 00:20, Stefan Roese <sr at denx.de> wrote:
> Hi!
>
> I'm currently trying to get xHCI working on some BayTrail based
> x86 boards. For this I've added DM support to xhci-pci and made a
> small change to cache.h to enable compilation of the xhci driver on
> x86 (please find those 2 patches attached - I'll send then to the
> list once this is resolved). But I noticed that the xhci driver
> hangs in xhci_queue_command() in this line:
>
>         xhci_writel(&ctrl->dba->doorbell[0], DB_VALUE_HOST);
>
> when first writing to the doorbell register. Reading from this doorbell
> register still works just fine.
>
> IIRC, Simon has mentioned that xHCI still has some "issues" on x86.
> Simon, is this what you have seen as well? Does anyone have some ideas
> how to solve this?

I'm really not sure what is wrong, sorry. The discussion about
enabling the pin settings correctly may be relevant since I believe
two GPIOs need to be set up for both ports to work, and that patch was
never cleaned up and applied, so far as I know...

Regards,
Simon