On Thu, Mar 10, 2016 at 09:57:09PM +0100, Rafael J. Wysocki wrote:

quoted

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/

quoted

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. I don't think there is a need to call
any pci_set_power_state() in this driver but maybe I'm missing
something.