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

[Xuewen Yan]

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>
---
 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 d5ef3c66c762..deb1219435a5 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;
@@ -318,6 +321,8 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
 	} else {
 		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