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

huang ying
2013-04-02T05:32:07Z

On Tue, Apr 2, 2013 at 1:28 PM, huang ying <huang.ying.caritas@gmail.com> wrote:
> On Tue, Apr 2, 2013 at 4:51 AM, Rafael J. Wysocki <rjw@sisk.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@sisk.pl> wrote:
>> > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.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.

For Martin's hotplug issue, it appears that a similar patch I sent to
him resolve his hotplug issue too. For Martin's "XHCI dead port"
issue, that is, PME issue. I just sent him another debug patch to
try. Sorry for late!

Best Regards,
Huang Ying