WSL2-Linux-Kernel/drivers/cpuidle
Ulf Hansson 2bcec28ac0 cpuidle: PSCI: Improve support for suspend-to-RAM for PSCI OSI mode
[ Upstream commit 171b66e2e2 ]

When PSCI OSI mode is supported the syscore flag is set for the CPU devices
that becomes attached to their PM domains (genpds). In the suspend-to-idle
case, we call dev_pm_genpd_suspend|resume() to allow genpd to properly
manage the power-off/on operations (pick an idlestate and manage the on/off
notifications).

For suspend-to-ram, dev_pm_genpd_suspend|resume() is currently not being
called, which causes a problem that the genpd on/off notifiers do not get
sent as expected. This prevents the platform-specific operations from being
executed, typically needed just before/after the boot CPU is being turned
off/on.

To deal with this problem, let's register a syscore ops for cpuidle-psci
when PSCI OSI mode is being used and call dev_pm_genpd_suspend|resume()
from them. In this way, genpd regains control of the PM domain topology and
then sends the on/off notifications when it's appropriate.

Reported-by: Maulik Shah <quic_mkshah@quicinc.com>
Suggested-by: Maulik Shah <quic_mkshah@quicinc.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Maulik Shah <quic_mkshah@quicinc.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-09 10:22:33 +02:00
..
governors cpuidle: teo: Rename two local variables in teo_select() 2021-08-03 15:18:57 +02:00
Kconfig
Kconfig.arm
Kconfig.mips
Kconfig.powerpc
Makefile
coupled.c
cpuidle-arm.c
cpuidle-at91.c
cpuidle-big_little.c
cpuidle-calxeda.c
cpuidle-clps711x.c
cpuidle-cps.c
cpuidle-exynos.c
cpuidle-haltpoll.c
cpuidle-kirkwood.c
cpuidle-mvebu-v7.c
cpuidle-powernv.c
cpuidle-psci-domain.c
cpuidle-psci.c cpuidle: PSCI: Improve support for suspend-to-RAM for PSCI OSI mode 2022-06-09 10:22:33 +02:00
cpuidle-psci.h
cpuidle-pseries.c cpuidle: pseries: Mark pseries_idle_proble() as __init 2021-08-04 10:53:38 +10:00
cpuidle-qcom-spm.c
cpuidle-tegra.c
cpuidle-ux500.c mfd/cpuidle: ux500: Rename driver symbol 2021-08-16 13:42:34 +01:00
cpuidle-zynq.c
cpuidle.c
cpuidle.h
driver.c
dt_idle_states.c
dt_idle_states.h
governor.c
poll_state.c
sysfs.c cpuidle: Fix kobject memory leaks in error paths 2021-11-18 19:16:29 +01:00