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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-11 19:11:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-11 19:11:06 -0700
commitfa9a67ef9de48de5474ea1e5a358340369e78b74 (patch)
tree29cd125c13977b5c84f3ff99cd2f51b581d3d907 /drivers/base
parent05c78081d2d8eaf04bf60946fcc53380febf3376 (diff)
parent4614e0cc66a8ea1d163efc364ba743424dee5c0a (diff)
Merge tag 'pm+acpi-4.3-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management and ACPI updates from Rafael Wysocki: "These are mostly fixes and cleanups on top of the previous PM+ACPI pull request (cpufreq core and drivers, cpuidle, generic power domains framework). Some of them didn't make to that pull request and some fix issues introduced by it. The only really new thing is the support for suspend frequency in the cpufreq-dt driver, but it is needed to fix an issue with Exynos platforms. Specifics: - build fix for the new Mediatek MT8173 cpufreq driver (Guenter Roeck). - generic power domains framework fixes (power on error code path, subdomain removal) and cleanup of a deprecated API user (Geert Uytterhoeven, Jon Hunter, Ulf Hansson). - cpufreq-dt driver fixes including two fixes for bugs related to the new Operating Performance Points Device Tree bindings introduced recently (Viresh Kumar). - suspend frequency support for the cpufreq-dt driver (Bartlomiej Zolnierkiewicz, Viresh Kumar). - cpufreq core cleanups (Viresh Kumar). - intel_pstate driver fixes (Chen Yu, Kristen Carlson Accardi). - additional sanity check in the cpuidle core (Xunlei Pang). - fix for a comment related to CPU power management (Lina Iyer)" * tag 'pm+acpi-4.3-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: intel_pstate: fix PCT_TO_HWP macro intel_pstate: Fix user input of min/max to legal policy region PM / OPP: Return suspend_opp only if it is enabled cpufreq-dt: add suspend frequency support cpufreq: allow cpufreq_generic_suspend() to work without suspend frequency PM / OPP: add dev_pm_opp_get_suspend_opp() helper staging: board: Migrate away from __pm_genpd_name_add_device() cpufreq: Use __func__ to print function's name cpufreq: staticize cpufreq_cpu_get_raw() PM / Domains: Ensure subdomain is not in use before removing cpufreq: Add ARM_MT8173_CPUFREQ dependency on THERMAL cpuidle/coupled: Add sanity check for safe_state_index PM / Domains: Try power off masters in error path of __pm_genpd_poweron() cpufreq: dt: Tolerance applies on both sides of target voltage cpufreq: dt: Print error on failing to mark OPPs as shared cpufreq: dt: Check OPP count before marking them shared kernel/cpu_pm: fix cpu_cluster_pm_exit comment
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c38
-rw-r--r--drivers/base/power/opp.c28
2 files changed, 53 insertions, 13 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 416720159e96..16550c63d611 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -213,6 +213,18 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
}
/**
+ * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
+ * @genpd: PM domait to power off.
+ *
+ * Queue up the execution of pm_genpd_poweroff() unless it's already been done
+ * before.
+ */
+static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
+{
+ queue_work(pm_wq, &genpd->power_off_work);
+}
+
+/**
* __pm_genpd_poweron - Restore power to a given PM domain and its masters.
* @genpd: PM domain to power up.
*
@@ -259,8 +271,12 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
return 0;
err:
- list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node)
+ list_for_each_entry_continue_reverse(link,
+ &genpd->slave_links,
+ slave_node) {
genpd_sd_counter_dec(link->master);
+ genpd_queue_power_off_work(link->master);
+ }
return ret;
}
@@ -349,18 +365,6 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
}
/**
- * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
- * @genpd: PM domait to power off.
- *
- * Queue up the execution of pm_genpd_poweroff() unless it's already been done
- * before.
- */
-static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
-{
- queue_work(pm_wq, &genpd->power_off_work);
-}
-
-/**
* pm_genpd_poweroff - Remove power from a given PM domain.
* @genpd: PM domain to power down.
*
@@ -1469,6 +1473,13 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
mutex_lock(&genpd->lock);
+ if (!list_empty(&subdomain->slave_links) || subdomain->device_count) {
+ pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
+ subdomain->name);
+ ret = -EBUSY;
+ goto out;
+ }
+
list_for_each_entry(link, &genpd->master_links, master_node) {
if (link->slave != subdomain)
continue;
@@ -1487,6 +1498,7 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
break;
}
+out:
mutex_unlock(&genpd->lock);
return ret;
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index eb254497a494..28cd75c535b0 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -341,6 +341,34 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
/**
+ * dev_pm_opp_get_suspend_opp() - Get suspend opp
+ * @dev: device for which we do this operation
+ *
+ * Return: This function returns pointer to the suspend opp if it is
+ * defined and available, otherwise it returns NULL.
+ *
+ * Locking: This function must be called under rcu_read_lock(). opp is a rcu
+ * protected pointer. The reason for the same is that the opp pointer which is
+ * returned will remain valid for use with opp_get_{voltage, freq} only while
+ * under the locked area. The pointer returned must be used prior to unlocking
+ * with rcu_read_unlock() to maintain the integrity of the pointer.
+ */
+struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
+{
+ struct device_opp *dev_opp;
+
+ opp_rcu_lockdep_assert();
+
+ dev_opp = _find_device_opp(dev);
+ if (IS_ERR(dev_opp) || !dev_opp->suspend_opp ||
+ !dev_opp->suspend_opp->available)
+ return NULL;
+
+ return dev_opp->suspend_opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp);
+
+/**
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp list
* @dev: device for which we do this operation
*