linux-kernel - Re: [PATCH] PCI: Add quirk for Cavium Thunder-X2 PCIe erratum #173

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Date:   Tue, 20 Feb 2018 11:58:50 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        George Cherian <george.cherian@...ium.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        bhelgaas@...gle.com, Jayachandran.Nair@...ium.com,
        Robert.Richter@...ium.com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH] PCI: Add quirk for Cavium Thunder-X2 PCIe erratum #173

On Tuesday, February 20, 2018 2:54:33 AM CET Lukas Wunner wrote:
> On Mon, Feb 19, 2018 at 12:21:56PM +0100, Rafael J. Wysocki wrote:
> > On Friday, February 16, 2018 9:34:34 PM CET Bjorn Helgaas wrote:
> > > On Fri, Feb 16, 2018 at 01:40:37PM +0100, Rafael J. Wysocki wrote:
> > > > On Friday, February 16, 2018 12:39:00 AM CET Bjorn Helgaas wrote:
> > > > > On Thu, Feb 15, 2018 at 10:57:25PM +0100, Rafael J. Wysocki wrote:
> > > > > > On Wednesday, February 14, 2018 9:16:53 PM CET Bjorn Helgaas wrote:
> > > > > > > I don't know how this runtime PM works, but maybe Rafael can help
> > > > > > > us out.
> 
> This has nothing to do with runtime PM AFAICS.
> 
> The device seems to be in D3hot on boot, is that correct?
> The PCI core assumes that unbound devices remain in D0
> (see comments in pci_pm_runtime_resume() / pci_pm_runtime_suspend()).

Which may not be the case when user space fiddles with the runtime PM
sysfs for them IIRC.