linux-kernel - [PATCH 08/10] PM: domains: Store the closest hrtimer event of the domain CPUs

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Message-ID: <1641749107-31979-9-git-send-email-quic_mkshah@quicinc.com>
Date:   Sun, 9 Jan 2022 22:55:05 +0530
From:   Maulik Shah <quic_mkshah@...cinc.com>
To:     <bjorn.andersson@...aro.org>, <ulf.hansson@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <rafael@...nel.org>,
        <daniel.lezcano@...aro.org>, <quic_lsrao@...cinc.com>,
        <quic_rjendra@...cinc.com>, Maulik Shah <quic_mkshah@...cinc.com>
Subject: [PATCH 08/10] PM: domains: Store the closest hrtimer event of the domain CPUs

The arch timer can not wake up the Qualcomm Technologies, Inc. (QTI)
SoCs when the deepest CPUidle modes results in the SoC also to enter
the low power mode.

RSC is part of CPU subsystem and APSS rsc device is attached to cluster
power domain. RSC has to setup next hrtimer wakeup in CONTROL_TCS which
can wakeup the SoC from deepest low power states. The CONTROL_TCS does
this by writing next wakeup in always on domain timer when the SoC is
entering the low power state.

Store the domain wakeup time from all the CPUs which can be used from
domain power off callback by RSC device.

Signed-off-by: Maulik Shah <quic_mkshah@...cinc.com>
---
 drivers/base/power/domain_governor.c | 1 +
 include/linux/pm_domain.h            | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index cd08c58..a4c7dd8 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -363,6 +363,7 @@ static bool cpu_power_down_ok(struct dev_pm_domain *pd)
 				domain_wakeup = next_hrtimer;
 		}
 	}
+	genpd->next_hrtimer = domain_wakeup;
 
 	/* The minimum idle duration is from now - until the next wakeup. */
 	idle_duration_ns = ktime_to_ns(ktime_sub(domain_wakeup, now));
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 67017c9..682b372 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -136,6 +136,7 @@ struct generic_pm_domain {
 	struct gpd_dev_ops dev_ops;
 	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
 	ktime_t next_wakeup;	/* Maintained by the domain governor */
+	ktime_t next_hrtimer;	/* Closest hrtimer event of the domain CPUs */
 	bool max_off_time_changed;
 	bool cached_power_down_ok;
 	bool cached_power_down_state_idx;
-- 
2.7.4