linux-kernel - Re: [RFC PATCH 0/7] usb: typec: ucsi: Polling the alt modes and PDOs

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Date:   Tue, 8 Jun 2021 09:54:07 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Benjamin Berg <bberg@...hat.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/7] usb: typec: ucsi: Polling the alt modes and PDOs

On Tue, Jun 08, 2021 at 09:42:09AM +0300, Heikki Krogerus wrote:
> On Mon, Jun 07, 2021 at 10:09:58PM +0200, Benjamin Berg wrote:
> > Hi Heikki,
> > 
> > On Mon, 2021-06-07 at 16:14 +0300, Heikki Krogerus wrote:
> > > This is the RFC series I promised [1].
> > 
> > Cool.
> > 
> > > I'm sorry it took this long to prepare these. I had to concentrate on
> > > other task for a while.
> > > 
> > > Let me know if you still see any problems.
> > 
> > Hmm, I am not sure this got better. I applied the patchset on top of of
> > the 5.12.9 Fedora 34 kernel. On the machine in question (X1 Carbon 8),
> > I see the online state getting stuck at 1 occasionally. This can happen
> > for example when quickly plugging and unplugging a USB-C charger.
> 
> Please check does the partner device get removed. What do you have
> under /sys/class/typec after that happens?

Oh yes. Could you also share the trace output when that happens?

        cd /sys/kernel/debug/tracing
        echo 1 > events/ucsi/enable
        # now reproduce the issue
        cat trace > ucsi.trace

thanks,

-- 
heikki