linux-kernel - Re: [Update][PATCH] PCI / PM: Disable runtime PM of PCIe ports

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Message-ID: <CAC=cRTPyC0rrDeRaMop3GF17qa3i2mfQ3XyHgNaEmiKNOE1Auw@mail.gmail.com>
Date:	Tue, 2 Apr 2013 13:28:46 +0800
From:	huang ying <huang.ying.caritas@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Zheng Yan <zheng.z.yan@...el.com>
Subject: Re: [Update][PATCH] PCI / PM: Disable runtime PM of PCIe ports

On Tue, Apr 2, 2013 at 4:51 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>
> On Monday, April 01, 2013 11:34:46 AM Bjorn Helgaas wrote:
> > [+cc Zheng, who added this with 71a83bd727]
> >
> > On Sat, Mar 30, 2013 at 4:38 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > >
> > > The runtime PM of PCIe ports turns out to be quite fragile, as in
> > > some cases things work while in some other cases they don't and we
> > > don't seem to have a good way to determine whether or not they are
> > > going to work in advance.
> >
> > Do you have any references to problems encountered when enabling
> > runtime PM for PCIe ports?  That information will be useful to anybody
> > who wants to take another crack at getting this working.
>
> Well, bug 53811 is one example and problems recently reported by
> Martin are another.  Do you want me to dig deeper?

For bug 53811, I have a debug patch posted in bugzilla to disable
runtime PM for PCIe port with hotplug capability.  It appears that
patch resolved the issue for the reporter.  Do think that patch can
solve the hotplug issue.

Best Regards,
Huang Ying
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