linux-kernel - [PATCH v2 2/2] thermal: intel: pch: Fix unexpected shutdown at critical temperature

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Message-Id: <20201221172345.36976-2-kai.heng.feng@canonical.com>
Date:   Tue, 22 Dec 2020 01:23:44 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     andrzej.p@...labora.com, mjg59@...gle.com,
        srinivas.pandruvada@...ux.intel.com,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andres Freund <andres@...razel.de>,
        Chuhong Yuan <hslester96@...il.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        linux-pm@...r.kernel.org (open list:THERMAL),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 2/2] thermal: intel: pch: Fix unexpected shutdown at critical temperature

Like previous patch, the intel_pch_thermal device is not in ACPI
ThermalZone namespace, so a critical trip doesn't mean shutdown.

Override the default .critical callback to prevent surprising thermal
shutdoown.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v2:
 - Amend subject.

 drivers/thermal/intel/intel_pch_thermal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
index 41723c6c6c0c..527c91f5960b 100644
--- a/drivers/thermal/intel/intel_pch_thermal.c
+++ b/drivers/thermal/intel/intel_pch_thermal.c
@@ -326,10 +326,16 @@ static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *tem
 	return 0;
 }
 
+static void pch_critical(struct thermal_zone_device *tzd)
+{
+	dev_dbg(&tzd->device, "%s: critical temperature reached\n", tzd->type);
+}
+
 static struct thermal_zone_device_ops tzd_ops = {
 	.get_temp = pch_thermal_get_temp,
 	.get_trip_type = pch_get_trip_type,
 	.get_trip_temp = pch_get_trip_temp,
+	.critical = pch_critical,
 };
 
 enum board_ids {
-- 
2.29.2