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PM: domains: Add support for 'required-opps' to set default perf state

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Some devices 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.
runtime suspend/resume callbacks already have logic to drop/set
the vote as needed and should take care of dropping the default
perf state vote on runtime suspend and restore it back on runtime
resume.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rajendra Nayak 2021-08-12 16:57:21 +05:30 committed by Rafael J. Wysocki
parent 020d86fc0d
commit c016baf7dc
2 changed files with 29 additions and 2 deletions
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30
drivers/base/power/domain.c
View file

@ -2598,6 +2598,12 @@ 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)
@ -2637,6 +2643,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
{
struct of_phandle_args pd_args;
struct generic_pm_domain *pd;
int pstate;
int ret;
ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
@ -2675,10 +2682,29 @@ 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;
}
return ret ? -EPROBE_DEFER : 1;
/* Set the default performance state */
pstate = of_get_required_opp_performance_state(dev->of_node, index);
if (pstate < 0 && pstate != -ENODEV) {
ret = pstate;
goto err;
} else if (pstate > 0) {
ret = dev_pm_genpd_set_performance_state(dev, pstate);
if (ret)
goto err;
dev_gpd_data(dev)->default_pstate = pstate;
}
return 1;
err:
dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
pd->name, ret);
genpd_remove_device(pd, dev);
return ret;
}
/**

1
include/linux/pm_domain.h
View file

@ -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;