linux-kernel - Re: [PATCH] usb: typec: ucsi: Clear pending after acking connector change

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Message-ID: <7c09a6bf2ee0a644863f1ec8b333c871cf83d5b8.camel@redhat.com>
Date:   Tue, 18 May 2021 20:04:14 +0200
From:   Benjamin Berg <bberg@...hat.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: ucsi: Clear pending after acking connector
 change

On Tue, 2021-05-18 at 16:29 +0300, Heikki Krogerus wrote:
> On Mon, May 17, 2021 at 02:57:28PM +0200, Benjamin Berg wrote:
> > 
> > [SNIP]
> > Unfortunately, I don't feel it'll work. The problem that I was
> > seeing
> > looked like a race condition in the PPM itself, where the window is
> > the
> > time between the UCSI_GET_CONNECTOR_STATUS command and the
> > subsequent
> > ACK.
> > For such a firmware level bug in the PPM, we need a way to detect
> > the
> > race condition when it happens (or get a fix for the firmware).
> 
> OK. Let me know does the patch bring the issue back for you.

So, I just tried the patch, and I can occasionally reproduce the issue
where "online" for the ucsi power adapter is stuck at "1" after
unplugging with the patch applied.

Benjamin

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