From: Sibi Sankar <sibis@codeaurora.org>
To: viresh.kumar@linaro.org, sboyd@kernel.org,
georgi.djakov@linaro.org, saravanak@google.com
Cc: nm@ti.com, bjorn.andersson@linaro.org, agross@kernel.org,
david.brown@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com,
rjw@rjwysocki.net, linux-arm-msm@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, dianders@chromium.org,
mka@chromium.org, vincent.guittot@linaro.org,
amit.kucheria@linaro.org, ulf.hansson@linaro.org,
Sibi Sankar <sibis@codeaurora.org>
Subject: [RFC v3 04/10] OPP: Add and export helper to update voltage
Date: Tue, 28 Jan 2020 01:33:44 +0530 [thread overview]
Message-ID: <20200127200350.24465-5-sibis@codeaurora.org> (raw)
In-Reply-To: <20200127200350.24465-1-sibis@codeaurora.org>
Add and export 'dev_pm_opp_update_voltage' to find and update voltage
of an opp for a given frequency. This will be useful to update the opps
with voltages read back from firmware.
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
drivers/opp/core.c | 55 ++++++++++++++++++++++++++++++++++++++++++
include/linux/pm_opp.h | 10 ++++++++
2 files changed, 65 insertions(+)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 9aa2a44a5d638..f241e83ec926a 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2503,6 +2503,61 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
+/**
+ * dev_pm_opp_update_voltage() - Find and update voltage
+ * @dev: device for which we do this operation
+ * @freq: OPP frequency to update voltage
+ * @u_volt: voltage requested for this opp
+ *
+ * Find and update voltage of a disabled opp corresponding to the given
+ * frequency. This is useful only for devices with single power supply.
+ *
+ * Return: 0 if modification was successful or a negative error value.
+ */
+int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
+ unsigned long u_volt)
+{
+ struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
+ struct opp_table *opp_table;
+ unsigned long tol;
+ int ret = 0;
+
+ /* Find the opp_table */
+ opp_table = _find_opp_table(dev);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+ dev_err(dev, "%s: OPP table not found (%d)\n", __func__, ret);
+ return PTR_ERR(opp_table);
+ }
+
+ opp = dev_pm_opp_find_freq_exact(dev, freq, false);
+ if (IS_ERR(opp)) {
+ ret = PTR_ERR(opp);
+ goto put_table;
+ }
+
+ mutex_lock(&opp_table->lock);
+
+ /* update only if the opp is disabled */
+ if (opp->available) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
+ opp->supplies[0].u_volt_min = u_volt - tol;
+ opp->supplies[0].u_volt = u_volt;
+ opp->supplies[0].u_volt_min = u_volt + tol;
+
+unlock:
+ mutex_unlock(&opp_table->lock);
+ dev_pm_opp_put(opp);
+put_table:
+ dev_pm_opp_put_opp_table(opp_table);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_update_voltage);
+
/**
* dev_pm_opp_register_notifier() - Register OPP notifier for the device
* @dev: Device for which notifier needs to be registered
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 62c88898bae46..b26d492cbd635 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -132,6 +132,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
int dev_pm_opp_disable(struct device *dev, unsigned long freq);
+int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
+ unsigned long u_volt);
+
int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
@@ -311,6 +314,13 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
return 0;
}
+static inline int dev_pm_opp_update_voltage(struct device *dev,
+ unsigned long freq,
+ unsigned long u_volt)
+{
+ return 0;
+}
+
static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-01-27 20:04 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 20:03 [RFC v3 00/10] DDR/L3 Scaling support on SDM845 and SC7180 SoCs Sibi Sankar
2020-01-27 20:03 ` [RFC v3 01/10] arm64: dts: qcom: sdm845: Add SoC compatible to MTP Sibi Sankar
2020-01-28 20:40 ` Matthias Kaehlcke
2020-01-29 13:45 ` Sibi Sankar
2020-01-27 20:03 ` [RFC v3 02/10] cpufreq: blacklist SDM845 in cpufreq-dt-platdev Sibi Sankar
2020-01-28 20:44 ` Matthias Kaehlcke
2020-01-29 13:46 ` Sibi Sankar
2020-01-30 11:40 ` Sudeep Holla
2020-02-01 12:21 ` Sibi Sankar
2020-01-27 20:03 ` [RFC v3 03/10] cpufreq: blacklist SC7180 " Sibi Sankar
2020-01-28 20:45 ` Matthias Kaehlcke
2020-01-27 20:03 ` Sibi Sankar [this message]
2020-01-28 21:33 ` [RFC v3 04/10] OPP: Add and export helper to update voltage Matthias Kaehlcke
2020-01-29 13:49 ` Sibi Sankar
2020-01-27 20:03 ` [RFC v3 05/10] opp: of: export _opp_of_get_opp_desc_node Sibi Sankar
2020-01-27 20:03 ` [RFC v3 06/10] opp: Allow multiple opp_tables to be mapped to a single device Sibi Sankar
2020-01-27 20:03 ` [RFC v3 07/10] opp: Remove multiple attached opp tables from a device Sibi Sankar
2020-01-27 20:03 ` [RFC v3 08/10] cpufreq: qcom: Update the bandwidth levels on frequency change Sibi Sankar
2020-01-29 9:35 ` Lukasz Luba
2020-01-29 14:27 ` Sibi Sankar
2020-01-27 20:03 ` [RFC v3 09/10] arm64: dts: qcom: sdm845: Add cpu OPP tables Sibi Sankar
2020-01-29 1:24 ` Matthias Kaehlcke
2020-01-29 14:05 ` Sibi Sankar
2020-01-29 18:18 ` Matthias Kaehlcke
2020-01-27 20:03 ` [RFC v3 10/10] arm64: dts: qcom: sc7180: " Sibi Sankar
2020-01-29 2:54 ` [RFC v3 00/10] DDR/L3 Scaling support on SDM845 and SC7180 SoCs Rob Clark
2020-01-29 14:21 ` Sibi Sankar
2020-01-29 9:46 ` Lukasz Luba
2020-01-29 14:37 ` Sibi Sankar
2020-01-29 15:47 ` Lukasz Luba
2020-03-17 20:43 ` Sibi Sankar
2020-03-18 3:42 ` Viresh Kumar
2020-03-19 9:42 ` Rajendra Nayak
2020-03-19 10:11 ` Sibi Sankar
2020-03-19 10:24 ` Viresh Kumar
2020-03-19 10:53 ` Rajendra Nayak
2020-03-19 11:08 ` Viresh Kumar
2020-03-19 11:33 ` Rajendra Nayak
2020-03-20 8:01 ` Viresh Kumar
2020-03-19 10:57 ` Sibi Sankar
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