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linux/drivers/base/power
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Maulik Shah 7ac1c9f1af pmdomain: governor: Consider CPU latency tolerance from pm_domain_cpu_gov 
commit 500ba33284 upstream.

pm_domain_cpu_gov is selecting a cluster idle state but does not consider
latency tolerance of child CPUs. This results in deeper cluster idle state
whose latency does not meet latency tolerance requirement.

Select deeper idle state only if global and device latency tolerance of all
child CPUs meet.

Test results on SM8750 with 300 usec PM-QoS on CPU0 which is less than
domain idle state entry (2150) + exit (1983) usec latency mentioned in
devicetree, demonstrate the issue.

	# echo 300 > /sys/devices/system/cpu/cpu0/power/pm_qos_resume_latency_us

Before: (Usage is incrementing)
======
	# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
	State          Time Spent(ms) Usage      Rejected   Above      Below
	S0             29817          537        8          270        0

	# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
	State          Time Spent(ms) Usage      Rejected   Above      Below
	S0             30348          542        8          271        0

After: (Usage is not incrementing due to latency tolerance)
======
	# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
	State          Time Spent(ms) Usage      Rejected   Above      Below
	S0             39319          626        14         307        0

	# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
	State          Time Spent(ms) Usage      Rejected   Above      Below
	S0             39319          626        14         307        0

Signed-off-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
Fixes: e94999688e ("PM / Domains: Add genpd governor for CPUs")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250709-pmdomain_qos-v2-1-976b12257899@oss.qualcomm.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-07-24 08:51:49 +02:00
..
clock_ops.c PM: runtime: add devm_pm_clk_create helper 2021-08-26 11:28:07 -07:00
common.c PM: domains: Extend dev_pm_domain_detach() doc 2022-04-13 17:07:58 +02:00
domain.c pmdomain: core: Fix error checking in genpd_dev_pm_attach_by_id() 2025-06-27 11:07:20 +01:00
domain_governor.c pmdomain: governor: Consider CPU latency tolerance from pm_domain_cpu_gov 2025-07-24 08:51:49 +02:00
generic_ops.c drivers: base: power: add proper SPDX identifiers on files that did not have them. 2019-04-04 20:03:40 +02:00
main.c PM: sleep: Fix power.is_suspended cleanup for direct-complete devices 2025-06-27 11:07:18 +01:00
Makefile PM / QoS: Initial kunit test 2019-11-29 12:04:49 +01:00
power.h PM: sleep: wakeirq: fix wake irq arming 2023-08-03 10:24:16 +02:00
qos-test.c kunit: allow kunit tests to be loaded as a module 2020-01-09 16:42:29 -07:00
qos.c PM / QoS: Restore DEV_PM_QOS_MIN/MAX_FREQUENCY 2019-11-29 12:04:50 +01:00
runtime.c PM: runtime: fix denying of auto suspend in pm_suspend_timer_fn() 2025-06-27 11:07:32 +01:00
sysfs.c drivers core: Miscellaneous changes for sysfs_emit 2020-10-02 13:12:07 +02:00
trace.c rtc: Extend timeout for waiting for UIP to clear to 1s 2024-01-31 16:17:01 -08:00
wakeirq.c PM: sleep: wakeirq: fix wake irq warning in system suspend 2024-04-03 15:19:30 +02:00
wakeup.c PM: wakeup: Add extra debugging statement for multiple active IRQs 2022-09-03 20:04:33 +02:00
wakeup_stats.c PM: wakeup: remove redundant assignment to variable retval 2021-04-22 15:22:38 +02:00