linux-kernel - Re: [PATCH 1/2] vga_switcheroo: add power support for windows 10 machines.

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Date:	Mon, 14 Mar 2016 12:19:14 +1000
From:	Dave Airlie <airlied@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] vga_switcheroo: add power support for windows 10 machines.

On 11 March 2016 at 23:45, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Friday, March 11, 2016 12:58:15 PM Mika Westerberg wrote:
>> On Thu, Mar 10, 2016 at 09:57:09PM +0100, Rafael J. Wysocki wrote:
>> > > It doesn't seem to do any runtime PM,
>> > > I do wonder if pcieport should be doing it's own runtime PM handling,
>> > > but that is a
>> > > larger task than I'm thinking to tackle here.
>> >
>> > PCIe ports don't do PM - yet.  Mika has posted a series of patches to implement
>> > that, however, that are waiting for comments now:
>> >
>> > https://patchwork.kernel.org/patch/8453311/
>> > https://patchwork.kernel.org/patch/8453381/
>> > https://patchwork.kernel.org/patch/8453391/
>> > https://patchwork.kernel.org/patch/8453411/
>> > https://patchwork.kernel.org/patch/8453371/
>> > https://patchwork.kernel.org/patch/8453351/
>> >
>> > > Maybe I should be doing
>> > >
>> > > pci_set_power_state(pdev->bus->self, PCI_D3cold) ? I'm not really sure.
>> >
>> > Using pci_set_power_state() would be more appropriate IMO, but you can get
>> > to the bridge via dev->parent too, can't you?
>> >
>> > In any case, it looks like you and Mika need to talk. :-)
>>
>> When the vga_switcheroo device gets runtime suspended (with the above
>> runtime PM patchs for PCIe root ports) the root port should also be
>> runtime suspended by the PM core.
>
> Right, after your patches have been applied, the additional handling
> won't be needed.
>
> So Dave, maybe you can check if the Mika's patches help?

Hi Mika,

I tested your patches with a couple of changes on the Lenovo W541.

The attached patch contains the two things I needed to get the same
functionality
as my patches.

I'm really not in love with the per-chipset enablement for this,
really any chipsets
after a certain year should probably be better, as we'll constantly be
adding PCI Ids
for every chipset ever made, and I expect we'll forget some.

Dave.

View attachment "0001-RFC-PCI-enable-runtime-PM-on-pcieports-to-let-second.patch" of type "text/x-patch" (1772 bytes)