From: Rajendra Nayak <rnayak@codeaurora.org>
To: ulf.hansson@linaro.org, bjorn.andersson@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,
swboyd@chromium.org, rojay@codeaurora.org, stephan@gerhold.net,
digetx@gmail.com, Rajendra Nayak <rnayak@codeaurora.org>
Subject: [PATCH v7 2/3] PM / Domains: Add support for 'required-opps' to set default perf state
Date: Thu, 12 Aug 2021 16:57:21 +0530 [thread overview]
Message-ID: <1628767642-4008-3-git-send-email-rnayak@codeaurora.org> (raw)
In-Reply-To: <1628767642-4008-1-git-send-email-rnayak@codeaurora.org>
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(-)
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
next prev parent reply other threads:[~2021-08-12 11:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 11:27 [PATCH v7 0/3] PM / Domains: Add support for 'required-opps' to set default perf state Rajendra Nayak
2021-08-12 11:27 ` [PATCH v7 1/3] opp: Don't print an error if required-opps is missing Rajendra Nayak
2021-08-12 11:45 ` Ulf Hansson
2021-08-13 3:57 ` Viresh Kumar
2021-08-12 11:27 ` Rajendra Nayak [this message]
2021-08-12 11:45 ` [PATCH v7 2/3] PM / Domains: Add support for 'required-opps' to set default perf state Ulf Hansson
2021-08-16 16:47 ` Rafael J. Wysocki
2021-08-12 11:27 ` [PATCH v7 3/3] arm64: dts: sc7180: Add required-opps for i2c Rajendra Nayak
2021-08-12 11:45 ` Ulf Hansson
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