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Subject[PATCH] thermal: Use power efficient workqueue
Thermal core framework uses the system_freezable_wq workqueue as its
workqueue for polling temperature. Using system_freezable_wq workqueue
prevents the scheduler to make smart decision about the best place to
schedule the work.

This commit replaces system_freezable_wq with
system_freezable_power_efficient_wq. With kernel configuration
CONFIG_WQ_POWER_EFFICIENT is enabled, the work can be scheduled on the
best CPU from a power or a performance point of view.

This commit is inspired by Vincent Guittot patch "netfilter: conntrack:
use power efficient workqueue" and verified on 96boards Hikey960.

Cc: Eduardo Valentin <>
Cc: Zhang Rui <>
Cc: Daniel Lezcano <>
Cc: Vincent Guittot <>
Signed-off-by: Leo Yan <>
drivers/thermal/thermal_core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 2b1b0ba..ba90f71 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -293,11 +293,12 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
int delay)
if (delay > 1000)
- mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+ mod_delayed_work(system_freezable_power_efficient_wq,
+ &tz->poll_queue,
else if (delay)
- mod_delayed_work(system_freezable_wq, &tz->poll_queue,
- msecs_to_jiffies(delay));
+ mod_delayed_work(system_freezable_power_efficient_wq,
+ &tz->poll_queue, msecs_to_jiffies(delay));
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