linux-kernel - [PATCH v2 1/4] cpufreq: qcom-hw: Reset cancel

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Message-Id: <20220704112739.3020516-2-pierre.gondois@arm.com>
Date:   Mon,  4 Jul 2022 13:27:36 +0200
From:   Pierre Gondois <pierre.gondois@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Ionela.Voinescu@....com, Dietmar.Eggemann@....com,
        Pierre Gondois <pierre.gondois@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2 1/4] cpufreq: qcom-hw: Reset cancel_throttle when policy is re-enabled

If LMH (Limits Management Hardware) is available, when a policy is
disabled by unplugging the last online CPU of policy->cpus,
qcom_cpufreq_hw_cpu_offline() sets cancel_throttle=true.
cancel_throttle is not reset when the policy is re-enabled with any
of the CPU in policy->cpus being plugged in. So reset it.

This patch also adds an early exit check.

Signed-off-by: Pierre Gondois <pierre.gondois@....com>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 36c79580fba2..8e5eeb982ebd 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -445,6 +445,10 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
 	if (data->throttle_irq <= 0)
 		return 0;
 
+	mutex_lock(&data->throttle_lock);
+	data->cancel_throttle = false;
+	mutex_unlock(&data->throttle_lock);
+
 	ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus);
 	if (ret)
 		dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
-- 
2.25.1