PPD comes default on most distros (I can at least confirm for Debian, Ubuntu and Fedora on the GNOME variant). I am not sure about KDE variants but they should support it too even if it’s not pre-installed.
You can check if it’s running with the following command:
$ powerprofilesctl
However as the 0.20 release which supports p-state just released recently most fixed point release distros won’t have the newer version. In this case you would need to update it manually.
I am running Debian testing and it has the new version while stable does not.
Good point, edited!