linux-kernel - [PATCH] thermal/core: Clear all mitigation when thermal zone is disabled

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Date:   Tue, 21 Dec 2021 16:11:58 +0530
From:   Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Thara Gopinath <thara.gopinath@...aro.org>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Manaf Meethalavalappu Pallikunhi" <quic_manafm@...cinc.com>
Subject: [PATCH] thermal/core: Clear all mitigation when thermal zone is disabled

Whenever a thermal zone is in trip violated state, there is a chance
that the same thermal zone mode can be disabled either via thermal
core API or via thermal zone sysfs. Once it is disabled, the framework
bails out any re-evaluation of thermal zone. It leads to a case where
if it is already in mitigation state, it will stay the same state
until it is re-enabled.

To avoid above mentioned issue, on thermal zone disable request
reset thermal zone and clear mitigation for each trip explicitly.

Signed-off-by: Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
---
 drivers/thermal/thermal_core.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 51374f4..a8ae340 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -427,6 +427,7 @@ static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
 					enum thermal_device_mode mode)
 {
 	int ret = 0;
+	int count;
 
 	mutex_lock(&tz->lock);
 
@@ -449,8 +450,14 @@ static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
 
 	if (mode == THERMAL_DEVICE_ENABLED)
 		thermal_notify_tz_enable(tz->id);
-	else
+	else {
+		/* make sure all previous throttlings are cleared */
+		thermal_zone_device_init(tz);
+		for (count = 0; count < tz->trips; count++)
+			handle_thermal_trip(tz, count);
+
 		thermal_notify_tz_disable(tz->id);
+	}
 
 	return ret;
 }