From: Stephen Boyd <swboyd@chromium.org> To: Rajendra Nayak <rnayak@codeaurora.org>, bjorn.andersson@linaro.org, ulf.hansson@linaro.org, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, rojay@codeaurora.org, stephan@gerhold.net Subject: Re: [PATCH v4 1/2] PM / Domains: Add support for 'required-opps' to set default perf state Date: Fri, 16 Jul 2021 22:19:46 +0200 [thread overview] Message-ID: <CAE-0n52AkJWAL0ptFgZOrD_BXrrMte5EbZUksf5UYzBxYisCBQ@mail.gmail.com> (raw) In-Reply-To: <1626429658-18961-2-git-send-email-rnayak@codeaurora.org> Quoting Rajendra Nayak (2021-07-16 03:00:57) > Some devics within power domains with performance states do not devices > 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(-) > > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index a934c67..dcc0b71 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -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); Maybe this should be prev_state = genpd_drop_performance_state(dev); if (!default_pstate) gdp_data->rpm_pstate = prev_state; so we don't call dev_pm_genpd_set_performance_state() effectively twice? Also it would make sure we call dev_pm_genpd_set_performance_state() underneath the genpd_lock() if that is important. Similarly do that on suspend path. > 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) > @@ -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); Missing newline on printk. Also can we spell out pstate as "failed to set required performance state %d for power-domain %d"? > + 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; > } > > /**
next prev parent reply other threads:[~2021-07-16 20:19 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-16 10:00 [PATCH v4 0/2] " Rajendra Nayak 2021-07-16 10:00 ` [PATCH v4 1/2] " Rajendra Nayak 2021-07-16 20:19 ` Stephen Boyd [this message] 2021-07-19 11:50 ` Rajendra Nayak 2021-07-16 10:00 ` [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c Rajendra Nayak 2021-07-16 19:39 ` Stephen Boyd 2021-07-16 20:18 ` Bjorn Andersson 2021-07-16 20:21 ` Stephen Boyd 2021-07-16 20:52 ` Bjorn Andersson 2021-07-16 21:49 ` Stephen Boyd 2021-07-16 21:59 ` Bjorn Andersson 2021-07-19 9:37 ` Rajendra Nayak 2021-07-19 19:19 ` Bjorn Andersson 2021-07-20 4:29 ` Rajendra Nayak 2021-07-25 17:01 ` Bjorn Andersson 2021-07-27 7:35 ` Rajendra Nayak 2021-07-28 3:46 ` Bjorn Andersson 2021-07-28 14:01 ` Dmitry Baryshkov 2021-07-28 18:47 ` Bjorn Andersson
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