| Message ID | 1628767642-4008-3-git-send-email-rnayak@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | PM / Domains: Add support for 'required-opps' to set default perf state | expand |
On Thu, 12 Aug 2021 at 13:28, Rajendra Nayak <rnayak@codeaurora.org> wrote: > > 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> Kind regards Uffe > --- > drivers/base/power/domain.c | 30 ++++++++++++++++++++++++++++-- > include/linux/pm_domain.h | 1 + > 2 files changed, 29 insertions(+), 2 deletions(-) > > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index a934c67..e1c8994 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -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; > } > > /** > 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; > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation >
On Thu, Aug 12, 2021 at 1:46 PM Ulf Hansson <ulf.hansson@linaro.org> wrote: > > On Thu, 12 Aug 2021 at 13:28, Rajendra Nayak <rnayak@codeaurora.org> wrote: > > > > 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> All three patches applied as 5.15 material, thanks!
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a934c67..e1c8994 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -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; } /** 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 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> --- drivers/base/power/domain.c | 30 ++++++++++++++++++++++++++++-- include/linux/pm_domain.h | 1 + 2 files changed, 29 insertions(+), 2 deletions(-)