linux-kernel - Re: [RFC][PATCH] thunderbolt: icm: Ignore mailbox errors in icm

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Message-ID: <20170726083244.GE2369@lahna.fi.intel.com>
Date:   Wed, 26 Jul 2017 11:32:44 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC][PATCH] thunderbolt: icm: Ignore mailbox errors in
 icm_suspend()

On Tue, Jul 25, 2017 at 06:10:57PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, July 25, 2017 01:00:12 PM Mika Westerberg wrote:
> > On Tue, Jul 25, 2017 at 01:31:00AM +0200, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > 
> > > On one of my test machines nhi_mailbox_cmd() called from icm_suspend()
> > > times out and returnes an error which then is propagated to the
> > > caller and causes the entire system suspend to be aborted which isn't
> > > very useful.
> > > 
> > > Instead of aborting system suspend, print the error into the log
> > > and continue.
> > 
> > I agree, it should not prevent suspend but I wonder why it fails in the
> > first place? Can you check what is the return value?
> 
> As per the above, the error is a timeout, ie. -ETIMEDOUT.

Ah, right I somehow missed that.

Does it have Falcon Ridge controller or Alpine Ridge? Just to make sure,
can you increase the timeout in nhi_mailbox_cmd() to 1000ms or so. It
should not take that long though but better to check.

Which system this is BTW?