[PATCH 0/5] pmdomain: Restore behaviour for disabling unused PM domains

[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 [1].

In this series, I am therefore suggesting to restore the behavior of
genpd_power_off_unused() along with introducing a new genpd config flag,
GENPD_FLAG_NO_STAY_ON, to allow genpd OF providers to opt-out from the new
behaviour.

Kind regards
Ulf Hansson

[1]
https://lore.kernel.org/all/20250701114733.636510-1-ulf.hansson@linaro.org/
https://lore.kernel.org/all/20250902-rk3576-lockup-regression-v1-1-c4a0c9daeb00@collabora.com/

Ulf Hansson (5):
  pmdomain: core: Restore behaviour for disabling unused PM domains
  pmdomain: rockchip: Fix regulator dependency with
    GENPD_FLAG_NO_STAY_ON
  pmdomain: renesas: rcar-sysc: Don't keep unused PM domains powered-on
  pmdomain: renesas: rcar-gen4-sysc: Don't keep unused PM domains
    powered-on
  pmdomain: renesas: rmobile-sysc: Don't keep unused PM domains
    powered-on

 drivers/pmdomain/core.c                   | 20 ++++++++++++++------
 drivers/pmdomain/renesas/rcar-gen4-sysc.c |  1 +
 drivers/pmdomain/renesas/rcar-sysc.c      |  1 +
 drivers/pmdomain/renesas/rmobile-sysc.c   |  3 ++-
 drivers/pmdomain/rockchip/pm-domains.c    |  2 +-
 include/linux/pm_domain.h                 |  7 +++++++
 6 files changed, 26 insertions(+), 8 deletions(-)

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2.43.0