linux-kernel - [PATCH] thermal/drivers/cpuidle_cooling: Change the set_cur

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Message-Id: <20200917060031.6566-1-zhuguangqing83@gmail.com>
Date:   Thu, 17 Sep 2020 14:00:31 +0800
From:   zhuguangqing83@...il.com
To:     amit.kachhap@...il.com, daniel.lezcano@...aro.org,
        viresh.kumar@...aro.org, javi.merino@...nel.org,
        rui.zhang@...el.com, amitk@...nel.org, zhuguangqing@...omi.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] thermal/drivers/cpuidle_cooling: Change the set_cur_state function

From: zhuguangqing <zhuguangqing@...omi.com>

In the function cpuidle_cooling_set_cur_state(), if current_state is
not equal to state and both current_state and state are greater than
0(scene 4 as follows), then maybe it should stop->start or restart
idle_inject.

The scenes changed is as follows,

scene    current_state    state    action
 1              0          >0       start
 2              0          0        do nothing
 3              >0         0        stop
 4        >0 && !=state    >0       stop->start or restart
 5        >0 && ==state    >0       do nothing

Signed-off-by: zhuguangqing <zhuguangqing@...omi.com>
---
 drivers/thermal/cpuidle_cooling.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/cpuidle_cooling.c b/drivers/thermal/cpuidle_cooling.c
index 78e3e8238116..868919ad3dda 100644
--- a/drivers/thermal/cpuidle_cooling.c
+++ b/drivers/thermal/cpuidle_cooling.c
@@ -113,7 +113,7 @@ static int cpuidle_cooling_get_cur_state(struct thermal_cooling_device *cdev,
 /**
  * cpuidle_cooling_set_cur_state - Set the current cooling state
  * @cdev: the thermal cooling device
- * @state: the target state
+ * @state: the target state, max value is 100
  *
  * The function checks first if we are initiating the mitigation which
  * in turn wakes up all the idle injection tasks belonging to the idle
@@ -130,6 +130,9 @@ static int cpuidle_cooling_set_cur_state(struct thermal_cooling_device *cdev,
 	unsigned long current_state = idle_cdev->state;
 	unsigned int runtime_us, idle_duration_us;
 
+	if (state > 100 || current_state == state)
+		return 0;
+
 	idle_cdev->state = state;
 
 	idle_inject_get_duration(ii_dev, &runtime_us, &idle_duration_us);
@@ -140,8 +143,11 @@ static int cpuidle_cooling_set_cur_state(struct thermal_cooling_device *cdev,
 
 	if (current_state == 0 && state > 0) {
 		idle_inject_start(ii_dev);
-	} else if (current_state > 0 && !state)  {
+	} else if (current_state > 0 && !state) {
 		idle_inject_stop(ii_dev);
+	} else {
+		idle_inject_stop(ii_dev);
+		idle_inject_start(ii_dev);
 	}
 
 	return 0;
-- 
2.17.1