linux-kernel - [PATCH v1 06/11] thermal/drivers/ti: Use fixed update interval

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230307133735.90772-7-daniel.lezcano@linaro.org>
Date:   Tue,  7 Mar 2023 14:37:30 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, rafael@...nel.org
Cc:     rui.zhang@...el.com, amitk@...nel.org, Keerthy <j-keerthy@...com>,
        Eduardo Valentin <edubezval@...il.com>,
        linux-pm@...r.kernel.org (open list:TI BANDGAP AND THERMAL DRIVER),
        linux-omap@...r.kernel.org (open list:TI BANDGAP AND THERMAL DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 06/11] thermal/drivers/ti: Use fixed update interval

Currently the TI thermal driver sets the sensor update interval based
on the polling of the thermal zone. In order to get the polling rate,
the code inspects the thermal zone device strcuture internals, thus
breaking the self-encapsulation of the thermal framework core
framework.

On the other side, we see the common polling rates set in the device
tree for the platforms using this driver are 500 or 1000 ms.

Setting the polling rate to 250 ms would be far enough to cover the
combination we found in the device tree.

Instead of accessing the thermal zone device structure polling rate,
let's use a common update interval of 250 ms for the driver.

Cc: Keerthy <j-keerthy@...com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
index 0c8914017c18..430c4b43151f 100644
--- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -23,6 +23,8 @@
 #include "ti-bandgap.h"
 #include "../thermal_hwmon.h"
 
+#define TI_BANDGAP_UPDATE_INTERVAL_MS 250
+
 /* common data structures */
 struct ti_thermal_data {
 	struct cpufreq_policy *policy;
@@ -159,7 +161,6 @@ int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 			     char *domain)
 {
 	struct ti_thermal_data *data;
-	int interval;
 
 	data = ti_bandgap_get_sensor_data(bgp, id);
 
@@ -177,10 +178,9 @@ int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 		return PTR_ERR(data->ti_thermal);
 	}
 
-	interval = jiffies_to_msecs(data->ti_thermal->polling_delay_jiffies);
-
 	ti_bandgap_set_sensor_data(bgp, id, data);
-	ti_bandgap_write_update_interval(bgp, data->sensor_id, interval);
+	ti_bandgap_write_update_interval(bgp, data->sensor_id,
+					 TI_BANDGAP_UPDATE_INTERVAL_MS);
 
 	if (devm_thermal_add_hwmon_sysfs(bgp->dev, data->ti_thermal))
 		dev_warn(bgp->dev, "failed to add hwmon sysfs attributes\n");
-- 
2.34.1