linux-kernel - Re: [PATCH] PCI/portdrv: Skip enabling AER on external facing ports

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Date:   Fri, 21 Jan 2022 22:25:38 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, bhelgaas@...gle.com,
        koba.ko@...onical.com, Lukas Wunner <lukas@...ner.de>,
        Stuart Hayes <stuart.w.hayes@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/portdrv: Skip enabling AER on external facing ports

On Fri, Jan 21, 2022 at 8:44 PM Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>
> Hi,
>
> On Fri, Jan 21, 2022 at 08:31:27PM +0800, Kai-Heng Feng wrote:
> > Hi Mika,
> >
> > On Fri, Jan 21, 2022 at 6:55 PM Mika Westerberg
> > <mika.westerberg@...ux.intel.com> wrote:
> > >
> > > Hi Kai-Heng,
> > >
> > > On Fri, Jan 07, 2022 at 12:09:57PM +0800, Kai-Heng Feng wrote:
> > > > Only from root ports of thunderbolt devices.
> > > >
> > > > The error occurs as soon as the root port is runtime suspended to D3cold.
> > > >
> > > > Runtime suspend the AER service can resolve the issue. I wonder if
> > > > it's the right thing to do here?
> > >
> > > I think you are right here. It seems that AER "service driver" is
> > > completely missing PM hooks. Probably because it is more used in server
> > > type of systems where power management is not priority.
> >
> > Here is my previous attempt to suspend AER:
> > https://lore.kernel.org/linux-pci/20210127173101.446940-1-kai.heng.feng@canonical.com/
>
> That's great!
>
> I think we should do the same for runtime PM paths too, though. Will you
> take care of that as well? :)

Yes that's the plan. I hope I can persuade Bjorn this time...

Kai-Heng