pmdomain: rockchip: Fix regulator dependency with GENPD_FLAG_NO_STAY_ON

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 <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Fixes: 0e789b4 ("pmdomain: core: Leave powered-on genpds on until sync_state")
Fixes: 13a4b7f ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
Tested-by: Nicolas Frattaroli <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Acked-by: Heiko Stuebner <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>

Author: storulf

drivers/pmdomain/rockchip/pm-domains.c

@@ -865,7 +865,7 @@ static int rockchip_pm_add_one_domain(struct rockchip_pmu *pmu,
 	pd->genpd.power_on = rockchip_pd_power_on;
 	pd->genpd.attach_dev = rockchip_pd_attach_dev;
 	pd->genpd.detach_dev = rockchip_pd_detach_dev;
-	pd->genpd.flags = GENPD_FLAG_PM_CLK;
+	pd->genpd.flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_NO_STAY_ON;
 	if (pd_info->active_wakeup)
 		pd->genpd.flags |= GENPD_FLAG_ACTIVE_WAKEUP;
 	pm_genpd_init(&pd->genpd, NULL,