PM / Domains: Add GENPD_FLAG_RPM_ALWAYS_ON flag

This is for power domains which can only be powered off for suspend but
not as part of runtime PM.

Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 10 insertions, 2 deletions

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3d899e8abd58..a887575fafa9 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -130,6 +130,7 @@ static const struct genpd_lock_ops genpd_spin_ops = {
 #define genpd_is_always_on(genpd)       (genpd->flags & GENPD_FLAG_ALWAYS_ON)
 #define genpd_is_active_wakeup(genpd)   (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
 #define genpd_is_cpu_domain(genpd)      (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
+#define genpd_is_rpm_always_on(genpd)   (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
 
 static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
                 const struct generic_pm_domain *genpd)
@@ -517,7 +518,9 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
          * (1) The domain is configured as always on.
          * (2) When the domain has a subdomain being powered on.
          */
-        if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0)
+        if (genpd_is_always_on(genpd) ||
+                        genpd_is_rpm_always_on(genpd) ||
+                        atomic_read(&genpd->sd_count) > 0)
                 return -EBUSY;
 
         list_for_each_entry(pdd, &genpd->dev_list, list_node) {
@@ -1814,7 +1817,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
         }
 
         /* Always-on domains must be powered on at initialization. */
-        if (genpd_is_always_on(genpd) && !genpd_status_on(genpd))
+        if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
+                        !genpd_status_on(genpd))
                 return -EINVAL;
 
         if (genpd_is_cpu_domain(genpd) &&
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 0e8e356bed6a..b21f35f0ee2e 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -53,12 +53,16 @@
  *                              driver must then comply with the so called,
  *                              last-man-standing algorithm, for the CPUs in the
  *                              PM domain.
+ *
+ * GENPD_FLAG_RPM_ALWAYS_ON:    Instructs genpd to always keep the PM domain
+ *                              powered on except for system suspend.
  */
 #define GENPD_FLAG_PM_CLK        (1U << 0)
 #define GENPD_FLAG_IRQ_SAFE      (1U << 1)
 #define GENPD_FLAG_ALWAYS_ON     (1U << 2)
 #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
 #define GENPD_FLAG_CPU_DOMAIN    (1U << 4)
+#define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
 
 enum gpd_status {
         GPD_STATE_ACTIVE = 0,   /* PM domain is active */