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pmdomain: renesas: rcar-gen4-sysc: Don't keep unused PM domains powered-on

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The recent changes to genpd makes a genpd OF provider that is powered-on at
initialization to stay powered-on, until the ->sync_state() callback is
invoked for it.

This may not happen at all, if we wait for a consumer device to be probed,
leading to wasting energy. There are ways to enforce the ->sync_state()
callback to be invoked, through sysfs or via the probe-defer-timeout, but
none of them in its current form are a good fit for rcar-gen4-sysc PM
domains.

Let's therefore opt-out from this behaviour of genpd for now, by using the
GENPD_FLAG_NO_STAY_ON.

Link: https://lore.kernel.org/all/20250701114733.636510-1-ulf.hansson@linaro.org/
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 0e789b491b ("pmdomain: core: Leave powered-on genpds on until sync_state")
Fixes: 13a4b7fb62 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ulf Hansson
2025-09-09 13:11:23 +02:00
parent 36bbaec460
commit d929e42dea
1 changed files with 1 additions and 0 deletions
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1
drivers/pmdomain/renesas/rcar-gen4-sysc.c
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@@ -251,6 +251,7 @@ static int __init rcar_gen4_sysc_pd_setup(struct rcar_gen4_sysc_pd *pd)
genpd->detach_dev = cpg_mssr_detach_dev;
}
genpd->flags |= GENPD_FLAG_NO_STAY_ON;
genpd->power_off = rcar_gen4_sysc_pd_power_off;
genpd->power_on = rcar_gen4_sysc_pd_power_on;