[PATCH v9 4/8] PM: domains: Add get_performance_state() callback
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-08-27 01:38:08
Also in:
linux-tegra, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, generic pm domains, hibernation (aka software suspend, aka swsusp), power management core, suspend to ram, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Ulf Hansson, Linus Torvalds
Add get_performance_state() callback that retrieves and initializes performance state of a device attached to a power domain. This removes inconsistency of the performance state with hardware state. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/base/power/domain.c | 32 +++++++++++++++++++++++++++++--- include/linux/pm_domain.h | 2 ++ 2 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3a13a942d012..8b828dcdf7f8 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c@@ -2700,15 +2700,41 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, goto err; } else if (pstate > 0) { ret = dev_pm_genpd_set_performance_state(dev, pstate); - if (ret) + if (ret) { + dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", + pd->name, ret); goto err; + } dev_gpd_data(dev)->default_pstate = pstate; } + + if (pd->get_performance_state && !dev_gpd_data(dev)->default_pstate) { + bool dev_suspended = false; + + ret = pd->get_performance_state(pd, base_dev, &dev_suspended); + if (ret < 0) { + dev_err(dev, "failed to get performance state for power-domain %s: %d\n", + pd->name, ret); + goto err; + } + + pstate = ret; + + if (dev_suspended) { + dev_gpd_data(dev)->rpm_pstate = pstate; + } else if (pstate > 0) { + ret = dev_pm_genpd_set_performance_state(dev, pstate); + if (ret) { + dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", + pd->name, ret); + goto err; + } + } + } + return 1; err: - dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", - pd->name, ret); genpd_remove_device(pd, dev); return ret; }
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 67017c9390c8..4f78b31791ae 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h@@ -133,6 +133,8 @@ struct generic_pm_domain { struct dev_pm_opp *opp); int (*set_performance_state)(struct generic_pm_domain *genpd, unsigned int state); + int (*get_performance_state)(struct generic_pm_domain *genpd, + struct device *dev, bool *dev_suspended); struct gpd_dev_ops dev_ops; s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ ktime_t next_wakeup; /* Maintained by the domain governor */
--
2.32.0