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Subject[PATCH 2/3] PM / Domains: Add support for 'assigned-performance-states'
Date
For devices which have 'assigned-performance-states' specified in DT,
set the specified performance state during attach and drop it on detach.
Also drop/set as part of runtime suspend/resume callbacks.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
---
drivers/base/power/domain.c | 27 +++++++++++++++++++++++++++
include/linux/pm_domain.h | 1 +
2 files changed, 28 insertions(+)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 0a01df60..8704823 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -810,6 +810,10 @@ static int genpd_runtime_suspend(struct device *dev)
if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
return 0;

+ /* Drop the assigned performance state */
+ if (dev_gpd_data(dev)->assigned_pstate)
+ dev_pm_genpd_set_performance_state(dev, 0);
+
genpd_lock(genpd);
genpd_power_off(genpd, true, 0);
genpd_unlock(genpd);
@@ -829,6 +833,7 @@ static int genpd_runtime_resume(struct device *dev)
{
struct generic_pm_domain *genpd;
struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
+ unsigned int assigned_pstate = dev_gpd_data(dev)->assigned_pstate;
bool runtime_pm = pm_runtime_enabled(dev);
ktime_t time_start;
s64 elapsed_ns;
@@ -857,6 +862,9 @@ static int genpd_runtime_resume(struct device *dev)
if (ret)
return ret;

+ /* Set the assigned performance state */
+ if (assigned_pstate)
+ dev_pm_genpd_set_performance_state(dev, assigned_pstate);
out:
/* Measure resume latency. */
time_start = 0;
@@ -890,6 +898,8 @@ static int genpd_runtime_resume(struct device *dev)
err_poweroff:
if (!pm_runtime_is_irq_safe(dev) ||
(pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
+ if (assigned_pstate)
+ dev_pm_genpd_set_performance_state(dev, 0);
genpd_lock(genpd);
genpd_power_off(genpd, true, 0);
genpd_unlock(genpd);
@@ -2405,6 +2415,12 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)

dev_dbg(dev, "removing from PM domain %s\n", pd->name);

+ /* Drop the assigned performance state */
+ if (dev_gpd_data(dev)->assigned_pstate) {
+ dev_pm_genpd_set_performance_state(dev, 0);
+ dev_gpd_data(dev)->assigned_pstate = 0;
+ }
+
for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
ret = genpd_remove_device(pd, dev);
if (ret != -EAGAIN)
@@ -2442,6 +2458,7 @@ static void genpd_dev_pm_sync(struct device *dev)
static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
unsigned int index, bool power_on)
{
+ unsigned int assigned_pstate;
struct of_phandle_args pd_args;
struct generic_pm_domain *pd;
int ret;
@@ -2485,6 +2502,16 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
if (ret)
genpd_remove_device(pd, dev);

+ /* Set the assigned performance state */
+ if (!of_property_read_u32_index(base_dev->of_node,
+ "assigned-performance-states",
+ index, &assigned_pstate)) {
+ if (assigned_pstate) {
+ dev_pm_genpd_set_performance_state(dev, assigned_pstate);
+ dev_gpd_data(dev)->assigned_pstate = assigned_pstate;
+ }
+ }
+
return ret ? -EPROBE_DEFER : 1;
}

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 9ec78ee..4a415ee 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -180,6 +180,7 @@ struct generic_pm_domain_data {
struct notifier_block nb;
int cpu;
unsigned int performance_state;
+ unsigned int assigned_pstate;
void *data;
};

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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