Re: [PATCH v3 0/7] PCI/pwrctrl: Major rework to integrate pwrctrl devices with controller drivers

[Niklas Cassel]

On Mon, Dec 29, 2025 at 10:56:51PM +0530, Manivannan Sadhasivam via B4 Relay wrote:
> Hi,
> 
> This series provides a major rework for the PCI power control (pwrctrl)
> framework to enable the pwrctrl devices to be controlled by the PCI controller
> drivers.
> 
> Problem Statement
> =================
> 
> Currently, the pwrctrl framework faces two major issues:
> 
> 1. Missing PERST# integration

AFAICT, and from reading your reply here:

https://lore.kernel.org/linux-pci/ibvk4it7th4bi6djoxshjqjh7zusbulzpndac5jtqkqovvgcei@5sycben7pqkk/

  I suppose maybe you plan to enhance pwrctrl so it can assert/deassert
  individual PERST# in the hierarchy?

"No, that plan has been dropped for good. For now, PERST# will be handled
entirely by the controller drivers. Sharing the PERST# handling with pwrctrl
proved to be a pain and it looks more clean (after the API introduction) to
handle PERST# in controller drivers."

Thus, it seems that even after this series, pwrctrl will be missing PERST#
integration. Perhaps the cover letter could be rephrased to more clearly
highlight this.

Because it seems a bit weird that the first point of the problem statement
(missing PERST# integration) will still be the case after this series.


Kind regards,
Niklas