[PATCH 1/5] pmdomain: core: Restore behaviour for disabling unused PM domains

[Heiko Stübner]

Am Dienstag, 9. September 2025, 13:11:20 Mitteleuropäische Sommerzeit schrieb Ulf Hansson:
> Recent changes to genpd prevents those PM domains being powered-on during
> initialization from being powered-off during the boot sequence. Based upon
> whether CONFIG_PM_CONFIG_PM_GENERIC_DOMAINS_OF is set of not, genpd relies
> on the sync_state mechanism or the genpd_power_off_unused() (which is a
> late_initcall_sync), to understand when it's okay to allow these PM domains
> to be powered-off.
> 
> This new behaviour in genpd has lead to problems on different platforms.
> Let's therefore restore the behavior of genpd_power_off_unused().
> Moreover, let's introduce GENPD_FLAG_NO_STAY_ON, to allow genpd OF
> providers to opt-out from the new behaviour.
> 
> Link: https://lore.kernel.org/all/20250701114733.636510-1-ulf.hansson@linaro.org/
> Reported-by: Geert Uytterhoeven <geert at linux-m68k.org>
> Link: https://lore.kernel.org/all/20250902-rk3576-lockup-regression-v1-1-c4a0c9daeb00@collabora.com/
> Reported-by: Nicolas Frattaroli <nicolas.frattaroli at collabora.com>
> Fixes: 0e789b491ba0 ("pmdomain: core: Leave powered-on genpds on until sync_state")
> Fixes: 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
> Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>

NPU on rk3588 now again correctly gets its supplying regulator and
running said npu does not end up in a kernel panic :-)

Tested-by: Heiko Stuebner <heiko at sntech.de>