@@ -917,6 +917,10 @@ static int genpd_runtime_suspend(struct device *dev)
if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
return 0;
+ /* Drop the default performance state */
+ if (dev_gpd_data(dev)->default_pstate)
+ dev_pm_genpd_set_performance_state(dev, 0);
+
genpd_lock(genpd);
gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
genpd_power_off(genpd, true, 0);
@@ -937,6 +941,7 @@ static int genpd_runtime_resume(struct device *dev)
{
struct generic_pm_domain *genpd;
struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
+ unsigned int default_pstate = gpd_data->default_pstate;
struct gpd_timing_data *td = &gpd_data->td;
bool runtime_pm = pm_runtime_enabled(dev);
ktime_t time_start;
@@ -968,6 +973,9 @@ static int genpd_runtime_resume(struct device *dev)
if (ret)
return ret;
+ /* Set the default performance state */
+ if (default_pstate)
+ dev_pm_genpd_set_performance_state(dev, default_pstate);
out:
/* Measure resume latency. */
time_start = 0;
@@ -1000,6 +1008,8 @@ static int genpd_runtime_resume(struct device *dev)
genpd_stop_dev(genpd, dev);
err_poweroff:
if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) {
+ if (default_pstate)
+ dev_pm_genpd_set_performance_state(dev, 0);
genpd_lock(genpd);
gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
genpd_power_off(genpd, true, 0);
@@ -2598,6 +2608,12 @@ 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 default performance state */
+ if (dev_gpd_data(dev)->default_pstate) {
+ dev_pm_genpd_set_performance_state(dev, 0);
+ dev_gpd_data(dev)->default_pstate = 0;
+ }
+
for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
ret = genpd_remove_device(pd, dev);
if (ret != -EAGAIN)
@@ -2635,9 +2651,10 @@ 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)
{
+ struct device_node *np;
struct of_phandle_args pd_args;
struct generic_pm_domain *pd;
- int ret;
+ int ret, pstate;
ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells", index, &pd_args);
@@ -2675,10 +2692,24 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
genpd_unlock(pd);
}
- if (ret)
+ if (ret) {
genpd_remove_device(pd, dev);
+ return -EPROBE_DEFER;
+ }
+
+ /* Set the default performance state */
+ np = base_dev->of_node;
+ if (of_parse_phandle(np, "required-opps", index)) {
+ pstate = of_get_required_opp_performance_state(np, index);
+ if (pstate < 0) {
+ dev_err(dev, "failed to set pstate:%d", pstate);
+ ret = pstate;
+ }
+ dev_pm_genpd_set_performance_state(dev, pstate);
+ dev_gpd_data(dev)->default_pstate = pstate;
+ }
- return ret ? -EPROBE_DEFER : 1;
+ return ret ? ret : 1;
}
/**
@@ -198,6 +198,7 @@ struct generic_pm_domain_data {
struct notifier_block *power_nb;
int cpu;
unsigned int performance_state;
+ unsigned int default_pstate;
unsigned int rpm_pstate;
ktime_t next_wakeup;
void *data;
Some devics within power domains with performance states do not support DVFS, but still need to vote on a default/static state while they are active. They can express this using the 'required-opps' property in device tree, which points to the phandle of the OPP supported by the corresponding power-domains. Add support to parse this information from DT and then 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 | 37 ++++++++++++++++++++++++++++++++++--- include/linux/pm_domain.h | 1 + 2 files changed, 35 insertions(+), 3 deletions(-)