[PATCH v2 1/2] PCI/ASPM: Override the ASPM and Clock PM states set by BIOS for devicetree platforms

[Niklas Cassel]

On Wed, Oct 15, 2025 at 09:00:41PM +0800, Shawn Lin wrote:
> For now, this is a acceptable option if default ASPM policy enable L1ss
> w/o checking if the HW could supports it... But how about adding
> supports-clkreq stuff to upstream host driver directly? That would help
> folks enable L1ss if the HW is ready and they just need adding property
> to the DT.

I like your idea, if you have time, please send a patch.

However, adding (working) support for L1 substates (via 'supports-clkreq')
is new code, and should thus be queued for next release instead of v6.18.

For now, pcie-dw-rockchip.c is broken for a lot of PCIe devices, so the
fix should be minimal and target v6.18, i.e. something like:
https://lore.kernel.org/linux-pci/20251015123142.392274-2-cassel@kernel.org/

Support for L1 substates via 'supports-clkreq' can be added on top of that
patch (while targeting v6.19).


Kind regards,
Niklas