[PATCH v2] PCI: dwc: Make Link Up IRQ logic handle already powered on PCIe switches

[Niklas Cassel]

Hello Mani,

On Fri, Dec 12, 2025 at 12:52:35PM +0900, Manivannan Sadhasivam wrote:
> > This patch missed the v6.19 merge window (and so did the pwrctrl rework
> > series), so as long as Mani queues up both for v6.20 (with the pwrctrl
> > rework series getting applied first), I think we are good.
> > 
> 
> The plan is to merge pwrctrl series to v6.20 (unless we get strong objections),
> but once that happens, Qcom doesn't need this patch.
> 
> So it'd be good if you can just limit this patch to just Rockchip. Then once the
> Rockchip also moves to pwrctrl, we can revert this patch (also the whole IRQ
> based link up since the Root Port is not hotplug capable).

The main reason why I did not like a revert, was because it would remove
the nice feature where the bus is enumerated automatically on link up.

I assumed that the plan was to add Link Up IRQ support in pwrctrl in the
future.

If that is not the case, and the plan is instead to eventually remove the
existing Link Up IRQ support, then perhaps you could simply apply patches
from:
https://lore.kernel.org/linux-pci/20251111105100.869997-8-cassel@kernel.org/

Either the whole series or just patch 1 and 2, maintainer's choice :)


Kind regards,
Niklas