thermal: Added Bang-bang thermal governor
The bang-bang thermal governor uses a hysteresis to switch abruptly on
or off a cooling device. It is intended to control fans, which can
not be throttled but just switched on or off.
Bang-bang cannot be set as default governor as it is intended for
special devices only. For those special devices the driver needs to
explicitely request it.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Andreas Mohr <andi@lisas.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Javi Merino <javi.merino@arm.com>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Peter Feuerer <peter@piie.net>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 71b0ec0..4c2726b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1790,6 +1790,10 @@
if (result)
return result;
+ result = thermal_gov_bang_bang_register();
+ if (result)
+ return result;
+
return thermal_gov_user_space_register();
}
@@ -1797,6 +1801,7 @@
{
thermal_gov_step_wise_unregister();
thermal_gov_fair_share_unregister();
+ thermal_gov_bang_bang_unregister();
thermal_gov_user_space_unregister();
}