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From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org,
	linux-pm@vger.kernel.org
Cc: lukasz.luba@arm.com,
	dietmar.eggemann@arm.com,
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	quic_sibis@quicinc.com
Subject: [PATCH 2/2] cpufreq: scmi: Update Energy Model with allowed performance limits
Date: Wed,  3 Apr 2024 17:23:15 +0100
Message-Id: <20240403162315.1458337-3-lukasz.luba@arm.com>
In-Reply-To: <20240403162315.1458337-1-lukasz.luba@arm.com>
References: <20240403162315.1458337-1-lukasz.luba@arm.com>
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The Energy Model (EM) supports performance limits updates. Use the SCMI
notifications to get information from FW about allowed frequency scope for
the CPUs.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 drivers/cpufreq/scmi-cpufreq.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index d946b7a082584..90c8448578cb1 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -185,12 +185,25 @@ static int scmi_limit_notify_cb(struct notifier_block *nb, unsigned long event,
 {
 	struct scmi_data *priv = container_of(nb, struct scmi_data, limit_notify_nb);
 	struct scmi_perf_limits_report *limit_notify = data;
+	unsigned int limit_freq_max_khz, limit_freq_min_khz;
 	struct cpufreq_policy *policy = priv->policy;
-	unsigned int limit_freq_khz;
+	struct em_perf_domain *pd;
+	int ret;
+
+	limit_freq_max_khz = limit_notify->range_max_freq / HZ_PER_KHZ;
+	limit_freq_min_khz = limit_notify->range_min_freq / HZ_PER_KHZ;
 
-	limit_freq_khz = limit_notify->range_max_freq / HZ_PER_KHZ;
+	pd = em_cpu_get(policy->cpu);
+	if (pd) {
+		ret = em_update_performance_limits(pd, limit_freq_min_khz,
+						   limit_freq_max_khz);
+		if (ret)
+			dev_warn(priv->cpu_dev,
+				 "EM perf limits update failed\n");
+	}
 
-	policy->max = clamp(limit_freq_khz, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
+	policy->max = clamp(limit_freq_max_khz, policy->cpuinfo.min_freq,
+			    policy->cpuinfo.max_freq);
 
 	cpufreq_update_pressure(policy);
 
-- 
2.25.1