[PATCH 2/5] pmdomain: rockchip: Fix regulator dependency with GENPD_FLAG_NO_STAY_ON

[Heiko Stübner]

Am Dienstag, 9. September 2025, 13:11:21 Mitteleuropäische Sommerzeit schrieb Ulf Hansson:
> The deferred regulator retrieval for Rockchip PM domains are causing some
> weird dependencies. More precisely, if the power-domain is powered-on from
> the HW perspective, its corresponding regulator must not be powered-off via
> regulator_init_complete(), which is a late_initcall_sync.
> 
> Even on platforms that don't have the domain-supply regulator specified for
> the power-domain provider, may suffer from these problems.
> 
> More precisely, things just happen to work before, because
> genpd_power_off_unused() (also a late_initcall_sync) managed to power-off
> the PM domain before regulator_init_complete() powered-off the regulator.
> 
> Ideally this fragile dependency must be fixed properly for the Rockchip PM
> domains, but until then, let's fallback to the previous behaviour by using
> the GENPD_FLAG_NO_STAY_ON flag.
> 
> Link: https://lore.kernel.org/all/20250902-rk3576-lockup-regression-v1-1-c4a0c9daeb00@collabora.com/
> Reported-by: Nicolas Frattaroli <nicolas.frattaroli at collabora.com>
> Cc: Heiko Stuebner <heiko at sntech.de>
> Cc: Sebastian Reichel <sebastian.reichel 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>
Acked-by: Heiko Stuebner <heiko at sntech.de>