linux-kernel - [RFC PATCH 1/5] PM: domains: Allow power off queuing from providers

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Date:   Wed, 15 Mar 2023 15:23:26 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     linux-pm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [RFC PATCH 1/5] PM: domains: Allow power off queuing from providers

In some cases, the providers might choose to refuse powering off some
domains until all of the consumer have had a chance to probe, that is,
until sync state callback has been called. Such providers might choose
to disable such domains on their on, from the sync state callback. So,
in order to do that, they need a way to queue up a power off request.
Since the generic genpd already has such API, make that available to
those providers.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 drivers/base/power/domain.c | 3 ++-
 include/linux/pm_domain.h   | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 32084e38b73d..97d4e2f2da91 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -649,10 +649,11 @@ static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
  * Queue up the execution of genpd_power_off() unless it's already been done
  * before.
  */
-static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
+void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
 {
 	queue_work(pm_wq, &genpd->power_off_work);
 }
+EXPORT_SYMBOL_GPL(genpd_queue_power_off_work);
 
 /**
  * genpd_power_off - Remove power from a given PM domain.
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index f776fb93eaa0..c9c0b4916e25 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -231,6 +231,7 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 int pm_genpd_init(struct generic_pm_domain *genpd,
 		  struct dev_power_governor *gov, bool is_off);
 int pm_genpd_remove(struct generic_pm_domain *genpd);
+void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
 int dev_pm_genpd_remove_notifier(struct device *dev);
@@ -278,6 +279,11 @@ static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
 	return -EOPNOTSUPP;
 }
 
+void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
 						     unsigned int state)
 {
-- 
2.34.1