| Message ID | 1626412425-30715-2-git-send-email-rnayak@codeaurora.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v3,1/2] PM / Domains: Add support for 'required-opps' to set default perf state | expand |
On 7/16/2021 10:43 AM, Rajendra Nayak wrote: > 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 | 29 ++++++++++++++++++++++++++++- > include/linux/pm_domain.h | 1 + > 2 files changed, 29 insertions(+), 1 deletion(-) > > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index a934c67..eef5507 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -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); > @@ -2678,6 +2695,16 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, > if (ret) > genpd_remove_device(pd, dev); > > + /* 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_pm_genpd_set_performance_state(dev, pstate); > + dev_gpd_data(dev)->default_pstate = pstate; > + } > + } I realized this needs better error handling after I sent it out, I'll fix and respin. > + > return ret ? -EPROBE_DEFER : 1; > } > > diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h > index 21a0577..67017c9 100644 > --- a/include/linux/pm_domain.h > +++ b/include/linux/pm_domain.h > @@ -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; >
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a934c67..eef5507 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -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); @@ -2678,6 +2695,16 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, if (ret) genpd_remove_device(pd, dev); + /* 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_pm_genpd_set_performance_state(dev, pstate); + dev_gpd_data(dev)->default_pstate = pstate; + } + } + return ret ? -EPROBE_DEFER : 1; } diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 21a0577..67017c9 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -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 | 29 ++++++++++++++++++++++++++++- include/linux/pm_domain.h | 1 + 2 files changed, 29 insertions(+), 1 deletion(-)