diff options
| author | Octav Zlatior <octav.zlatior@theobroma-systems.com> | 2015-06-08 16:38:50 +0200 |
|---|---|---|
| committer | Klaus Goger <klaus.goger@theobroma-systems.com> | 2015-07-30 18:53:03 +0200 |
| commit | 13766185a81306060b6c722739b6c0ee6b254563 (patch) | |
| tree | 76aa348e2e2b7050b1b7aa45a54c4595fc1082ba | |
| parent | 0af64655d7cc9caa2742fbed522a0e80f53dde07 (diff) | |
thermal: adds step-wise frequency capping
Frequency capping forces the cooling state to a minimum, defined by
the device tree. This forces the frequency to stay below a maximum
determined by the operating points as long as we are above a
thermal trip point.
Signed-off-by: Octav Zlatior <octav.zlatior@theobroma-systems.com>
| -rw-r--r-- | drivers/thermal/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/thermal/step_wise.c | 11 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index e03f79700de1..ca5079558cd4 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -92,6 +92,17 @@ config THERMAL_GOV_STEP_WISE Enable this to manage platform thermals using a simple linear governor. +config THERMAL_STEP_WISE_FREQUENCY_CAPPING + bool + prompt "Use frequency capping with step-wise" + depends on THERMAL_GOV_STEP_WISE + default n + help + This forces the cooling state to a minimum defined in the + device tree, virtually forcing the frequency to stay below + the corresponding operating point while a thermal trip + point is activated. + config THERMAL_GOV_BANG_BANG bool "Bang Bang thermal governor" default n diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c index 5a0f12d08e8b..04f4d21dcda7 100644 --- a/drivers/thermal/step_wise.c +++ b/drivers/thermal/step_wise.c @@ -81,9 +81,20 @@ static unsigned long get_target_state(struct thermal_instance *instance, if (!throttle) next_target = THERMAL_NO_TARGET; } else { +#ifdef CONFIG_THERMAL_STEP_WISE_FREQUENCY_CAPPING + if (!throttle) { + next_target = cur_state - 1; + if (next_target > instance->upper) + next_target = instance->upper; + } + else + next_target = cur_state > instance->upper ? + instance->upper : cur_state; +#else next_target = cur_state - 1; if (next_target > instance->upper) next_target = instance->upper; +#endif } break; case THERMAL_TREND_DROP_FULL: |