From 4fe58a1e5cb487f882266b410d34b2c5041eea7c Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 8 Dec 2011 23:27:28 +0100
Subject: PM / Domains: Provide an always on power domain governor

Since systems are likely to have power domains that can't be turned off
for various reasons at least temporarily while implementing power domain
support provide a default governor which will always refuse to power off
the domain, saving platforms having to implement their own.

Since the code is so tiny don't bother with a Kconfig symbol for it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
(cherry picked from commit 925b44a273aa8c4c23c006c1228aacd538eead09)

Signed-off-by: Simon Horman <horms@verge.net.au>
---
 drivers/base/power/domain_governor.c |   13 +++++++++++++
 include/linux/pm_domain.h            |    2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index da78540..51527ee 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -141,3 +141,16 @@ struct dev_power_governor simple_qos_governor = {
 	.stop_ok = default_stop_ok,
 	.power_down_ok = default_power_down_ok,
 };
+
+static bool always_on_power_down_ok(struct dev_pm_domain *domain)
+{
+	return false;
+}
+
+/**
+ * pm_genpd_gov_always_on - A governor implementing an always-on policy
+ */
+struct dev_power_governor pm_domain_always_on_gov = {
+	.power_down_ok = always_on_power_down_ok,
+	.stop_ok = default_stop_ok,
+};
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index fb809b9..a03a0ad 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -140,6 +140,7 @@ extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
 
 extern bool default_stop_ok(struct device *dev);
 
+extern struct dev_power_governor pm_domain_always_on_gov;
 #else
 
 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
@@ -193,6 +194,7 @@ static inline bool default_stop_ok(struct device *dev)
 {
 	return false;
 }
+#define pm_domain_always_on_gov NULL
 #endif
 
 static inline int pm_genpd_remove_callbacks(struct device *dev)
-- 
1.7.10.1.362.g242cab3