linux-kernel - [PATCH 1/2] cpufreq: qcom-cpufreq-hw: Register config

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Message-Id: <93bd5ab5346e4f22cd9db78afa778b2060d5741a.1669012140.git.viresh.kumar@linaro.org>
Date:   Mon, 21 Nov 2022 12:27:47 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        johan@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] cpufreq: qcom-cpufreq-hw: Register config_clks helper

In qcom-cpufreq-hw driver, we want to skip clk configuration that
happens via dev_pm_opp_set_opp(), but still want the OPP core to parse
the "opp-hz" property so we can use the freq based OPP helpers.

The OPP core provides support for the platforms to provide config_clks
helpers now, lets use that to provide an empty callback to skip clock
configuration.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 34 ++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 1bd1e9ae5308..5f8079898940 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -51,6 +51,7 @@ struct qcom_cpufreq_data {
 	 */
 	struct mutex throttle_lock;
 	int throttle_irq;
+	int opp_token;
 	char irq_name[15];
 	bool cancel_throttle;
 	struct delayed_work throttle_work;
@@ -58,7 +59,6 @@ struct qcom_cpufreq_data {
 	struct clk_hw cpu_clk;
 
 	bool per_core_dcvs;
-
 	struct freq_qos_request throttle_freq_req;
 };
 
@@ -197,6 +197,15 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
 	return policy->freq_table[index].frequency;
 }
 
+static int qcom_cpufreq_hw_config_clks(struct device *dev,
+				       struct opp_table *opp_table,
+				       struct dev_pm_opp *opp, void *data,
+				       bool scaling_down)
+{
+	/* We want to skip clk configuration via dev_pm_opp_set_opp() */
+	return 0;
+}
+
 static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
 				    struct cpufreq_policy *policy)
 {
@@ -208,11 +217,23 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
 	int ret;
 	struct qcom_cpufreq_data *drv_data = policy->driver_data;
 	const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
+	const char * const clk_names[] = { NULL, NULL };
+	struct dev_pm_opp_config config = {
+		.clk_names = clk_names,
+		.config_clks = qcom_cpufreq_hw_config_clks,
+	};
 
 	table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
 	if (!table)
 		return -ENOMEM;
 
+	ret = dev_pm_opp_set_config(cpu_dev, &config);
+	if (ret < 0) {
+		dev_err(cpu_dev, "Failed to set OPP config: %d\n", ret);
+		goto free_table;
+	}
+	drv_data->opp_token = ret;
+
 	ret = dev_pm_opp_of_add_table(cpu_dev);
 	if (!ret) {
 		/* Disable all opps and cross-validate against LUT later */
@@ -227,8 +248,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
 		}
 	} else if (ret != -ENODEV) {
 		dev_err(cpu_dev, "Invalid opp table in device tree\n");
-		kfree(table);
-		return ret;
+		goto clear_config;
 	} else {
 		policy->fast_switch_possible = true;
 		icc_scaling_enabled = false;
@@ -296,6 +316,13 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
 	dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
 
 	return 0;
+
+clear_config:
+	dev_pm_opp_clear_config(drv_data->opp_token);
+
+free_table:
+	kfree(table);
+	return ret;
 }
 
 static void qcom_get_related_cpus(int index, struct cpumask *m)
@@ -594,6 +621,7 @@ static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
 	dev_pm_opp_remove_all_dynamic(cpu_dev);
 	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
 	qcom_cpufreq_hw_lmh_exit(data);
+	dev_pm_opp_clear_config(data->opp_token);
 	kfree(policy->freq_table);
 	kfree(data);
 	iounmap(base);
-- 
2.31.1.272.g89b43f80a514