On 2018-04-05 11:24, Felipe Balbi wrote:

Greg KH <gre...@linuxfoundation.org> writes:
On Wed, Apr 04, 2018 at 05:14:50PM +0530, tnim...@codeaurora.org wrote:
Hi Oliver/Greg,

I am able to duplicated the UAS issue on 4.16 as well.
The behavior is same new usb device detects and reset after aprox 30
Logs are already shared below.

We are using Synopsys dwc3 as host controller, May I know have tested it
with dwc3?
I have tried it on Linux PC (x86 Ubuntu machine) I could not see the issue.
It enumerates well.

Great, stick with an x86 platform!  :)

Looks like a dwc3 host controller issue, try enabling tracing and
debugging in that driver when this happens to see what is going on.
Also look at all of the recent dwc3 patches that were just sent to Linus
for 4.17-rc1 to verify if that solves the issue.

dwc3's host side is xhci compliant :-) Some revisions have some quirks
which may not all be supported.
Felipe, "not all be supported" do u mean some xhci compliant host do not support uas? and they have such quirks
already defined?

Tushar, which dwc3 revision are you using? Have you gotten in touch with
it is DWC3_REVISION_300A   ..3.0a

your HW designers to ask for Errata List? A run with xhci tracepoints
will response you, let me cross check once again with errata list.
enabled will probably give a lot of insight into the issue.

Best Regards,
Tushar R Nimkar,

QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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