Re: More dwc3 gadget issues with adb

[John Stultz]

On Fri, Apr 24, 2020 at 10:12 AM Jack Pham <jackp@xxxxxxxxxxxxxx> wrote:
> On Tue, Apr 21, 2020 at 10:09:27PM -0700, John Stultz wrote:
> > Does something like this make sense? It's not causing trouble on
> > db845c either so far in my testing.
>
> Ok I'll bite...
>
> I'm now curious why it hasn't been a problem with the Qualcomm HW. Do
> you mind please capturing a similar trace log on the db845c?  Would be
> good to see a side-by-side comparison and see if, first of all, whether
> the same S/G path is getting exercised (i.e. 16KiB OUT requests from ADB
> userspace using AIO which then get broken up into 4K chunks by f_fs),
> and what the behaviors of the reclaim_trb and giveback are when the
> transfer is completed.
>
> Preferably if you could get a trace without your patch applied that
> would be great. And maybe also one after your patch just to see if the
> traces are truly identical or not.

Sure. I've captured logs in the same manner with and without on db845c
(against 5.7-rc2). See attached.

I suspect the difference is the db845c is using an iommu (I don't
think it will boot without it) where hikey960 isn't, but I'll let you
take a look.

thanks
-john

Attachment: db845c.tar.xz
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