linux-kernel - [PATCH v5 6/7] cpufreq: qcom-hw: Allow getting the maximum transition latency for OPPs

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Date:   Thu, 21 Jan 2021 20:52:49 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     viresh.kumar@...aro.org
Cc:     bjorn.andersson@...aro.org, agross@...nel.org, rjw@...ysocki.net,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        amit.kucheria@...aro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, jeffrey.l.hugo@...il.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH v5 6/7] cpufreq: qcom-hw: Allow getting the maximum transition latency for OPPs

In order to fine-tune the frequency scaling from various governors,
allow to set a maximum transition latency from OPPs, which may be
different depending on the SoC.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 9a213a3046bb..d2b913582197 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -1405,6 +1405,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	void __iomem *base;
 	struct qcom_cpufreq_data *data;
 	const char *fdom_resname;
+	unsigned int transition_latency;
 	int cpu_count, index, ret;
 
 	cpu_dev = get_cpu_device(policy->cpu);
@@ -1482,6 +1483,12 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 		goto error;
 	}
 
+	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
+	if (!transition_latency)
+		transition_latency = CPUFREQ_ETERNAL;
+
+	policy->cpuinfo.transition_latency = transition_latency;
+
 	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
 
 	return 0;
-- 
2.30.0