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

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Date:   Wed, 15 Jun 2022 16:43:18 +0200
From:   Pierre Gondois <pierre.gondois@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Ionela.Voinescu@....com, Lukasz.Luba@....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>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH 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.

Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations")
Signed-off-by: Pierre Gondois <pierre.gondois@....com>
---
 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 0253731d6d25..8aba73698eda 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -442,6 +442,13 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
 	struct platform_device *pdev = cpufreq_get_driver_data();
 	int ret;
 
+	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