[PATCH v2] cpufreq: qcom-cpufreq-hw: Add cpufreq qos for LMh

From: Xuewen Yan
Date: Mon Sep 26 2022 - 04:35:26 EST


Before update thermal pressure, the max cpufreq should be limited.
Add QOS control for Lmh throttle cpufreq.

Signed-off-by: Xuewen Yan <xuewen.yan@xxxxxxxxxx>
---
v1->v2:
reabse to cpufreq/arm/linux-next;
---
drivers/cpufreq/qcom-cpufreq-hw.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index bb32659820ce..833589bc95e4 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -13,6 +13,7 @@
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pm_opp.h>
+#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/units.h>
@@ -56,6 +57,8 @@ struct qcom_cpufreq_data {
struct cpufreq_policy *policy;

bool per_core_dcvs;
+
+ struct freq_qos_request throttle_freq_req;
};

static unsigned long cpu_hw_rate, xo_rate;
@@ -321,6 +324,8 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)

throttled_freq = freq_hz / HZ_PER_KHZ;

+ freq_qos_update_request(&data->throttle_freq_req, throttled_freq);
+
/* Update thermal pressure (the boost frequencies are accepted) */
arch_update_thermal_pressure(policy->related_cpus, throttled_freq);

@@ -413,6 +418,14 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
if (data->throttle_irq < 0)
return data->throttle_irq;

+ ret = freq_qos_add_request(&policy->constraints,
+ &data->throttle_freq_req, FREQ_QOS_MAX,
+ FREQ_QOS_MAX_DEFAULT_VALUE);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to add freq constraint (%d)\n", ret);
+ return ret;
+ }
+
data->cancel_throttle = false;
data->policy = policy;

@@ -479,6 +492,7 @@ static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
if (data->throttle_irq <= 0)
return;

+ freq_qos_remove_request(&data->throttle_freq_req);
free_irq(data->throttle_irq, data);
}

--
2.25.1