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

[Bin Meng]

Hi Stefan,

On Wed, Jun 21, 2017 at 8:07 PM, Stefan Roese <sr at denx.de> wrote:
> Hi Bin,
>
> On 21.06.2017 12:24, Bin Meng wrote:
>> On Wed, Jun 21, 2017 at 5:28 PM, Stefan Roese <sr at denx.de> wrote:
>
> <snip>
>
>>> As you can see, the 2 USB mass storage devices which are connected
>>> to the xHCI HSIC port are only detected after a power-up and not
>>> after a system reset.
>>>
>>> Is this something that you can reproduce on your setup? Could you
>>> please check and let me know if this works for you or if you have
>>> an idea on this issue?
>>
>> I cannot reproduce this on MinnowMax board. My testing env is one USB
>> 2.0 flash disk connected to the upper port and another USB 3.0 flash
>> disk connected to the bottom port. Please check log below.
>
> Thanks for testing. This issue seems to be related to the HSIC ports
> only connected to the xHCI and not the EHCI. I did the same test with
> USB memory devices connected to the "normal" USB ports that are also
> connected to the EHCI and they "survive" the reset the same way
> as your test on MinnowMax shows. I assume that those HSIC ports are
> not available / connected on MinnowMax, right?
>

Correct. There are no HSIC ports available on MinnowMax.

> Do you by any chance have some ideas on why this might be handled
> differently on these HSIC ports?
>

Maybe there are some quirks that the HSIC ports are having issues
after a reset. Like the issue I observed on the SS port as mentioned
in this patch [1] that SS port does not report CSC.

Can you enable -DDEBUG and send me the log?

[1] http://patchwork.ozlabs.org/patch/776728/

Regards,
Bin