Merge tag 'pm-4.18-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
 "These revert a recent PM core change that introduced a regression, fix
  the build when the recently added Kryo cpufreq driver is selected, add
  support for devices attached to multiple power domains to the generic
  power domains (genpd) framework, add support for iowait boosting on
  systens with hardware-managed P-states (HWP) enabled to the
  intel_pstate driver, modify the behavior of the wakeup_count device
  attribute in sysfs, fix a few issues and clean up some ugliness,
  mostly in cpufreq (core and drivers) and in the cpupower utility.

  Specifics:

   - Revert a recent PM core change that attempted to fix an issue
     related to device links, but introduced a regression (Rafael
     Wysocki)

   - Fix build when the recently added cpufreq driver for Kryo
     processors is selected by making it possible to build that driver
     as a module (Arnd Bergmann)

   - Fix the long idle detection mechanism in the out-of-band (ondemand
     and conservative) cpufreq governors (Chen Yu)

   - Add support for devices in multiple power domains to the generic
     power domains (genpd) framework (Ulf Hansson)

   - Add support for iowait boosting on systems with hardware-managed
     P-states (HWP) enabled to the intel_pstate driver and make it use
     that feature on systems with Skylake Xeon processors as it is
     reported to improve performance significantly on those systems
     (Srinivas Pandruvada)

   - Fix and update the acpi_cpufreq, ti-cpufreq and imx6q cpufreq
     drivers (Colin Ian King, Suman Anna, Sébastien Szymanski)

   - Change the behavior of the wakeup_count device attribute in sysfs
     to expose the number of events when the device might have aborted
     system suspend in progress (Ravi Chandra Sadineni)

   - Fix two minor issues in the cpupower utility (Abhishek Goel, Colin
     Ian King)"

* tag 'pm-4.18-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "PM / runtime: Fixup reference counting of device link suppliers at probe"
  cpufreq: imx6q: check speed grades for i.MX6ULL
  cpufreq: governors: Fix long idle detection logic in load calculation
  cpufreq: intel_pstate: enable boost for Skylake Xeon
  PM / wakeup: Export wakeup_count instead of event_count via sysfs
  PM / Domains: Add dev_pm_domain_attach_by_id() to manage multi PM domains
  PM / Domains: Add support for multi PM domains per device to genpd
  PM / Domains: Split genpd_dev_pm_attach()
  PM / Domains: Don't attach devices in genpd with multi PM domains
  PM / Domains: dt: Allow power-domain property to be a list of specifiers
  cpufreq: intel_pstate: New sysfs entry to control HWP boost
  cpufreq: intel_pstate: HWP boost performance on IO wakeup
  cpufreq: intel_pstate: Add HWP boost utility and sched util hooks
  cpufreq: ti-cpufreq: Use devres managed API in probe()
  cpufreq: ti-cpufreq: Fix an incorrect error return value
  cpufreq: ACPI: make function acpi_cpufreq_fast_switch() static
  cpufreq: kryo: allow building as a loadable module
  cpupower : Fix header name to read idle state name
  cpupower: fix spelling mistake: "logilename" -> "logfilename"

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index c6030f100c08..beb85c31f3fa 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1563,16 +1563,37 @@ void pm_runtime_clean_up_links(struct device *dev)
 }
 
 /**
- * pm_runtime_resume_suppliers - Resume supplier devices.
+ * pm_runtime_get_suppliers - Resume and reference-count supplier devices.
  * @dev: Consumer device.
  */
-void pm_runtime_resume_suppliers(struct device *dev)
+void pm_runtime_get_suppliers(struct device *dev)
 {
+	struct device_link *link;
 	int idx;
 
 	idx = device_links_read_lock();
 
-	rpm_get_suppliers(dev);
+	list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
+		if (link->flags & DL_FLAG_PM_RUNTIME)
+			pm_runtime_get_sync(link->supplier);
+
+	device_links_read_unlock(idx);
+}
+
+/**
+ * pm_runtime_put_suppliers - Drop references to supplier devices.
+ * @dev: Consumer device.
+ */
+void pm_runtime_put_suppliers(struct device *dev)
+{
+	struct device_link *link;
+	int idx;
+
+	idx = device_links_read_lock();
+
+	list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
+		if (link->flags & DL_FLAG_PM_RUNTIME)
+			pm_runtime_put(link->supplier);
 
 	device_links_read_unlock(idx);
 }