On Sun, Sep 27, 2015 at 06:48:28AM +0100, Chen Yu wrote:
> From: Zhang Rui <rui.zhang@xxxxxxxxx>
>
> After thermal zone device registered, as we have not read any
> temperature before, thus tz->temperature should not be 0,
> which actually means 0C, and thermal trend is not available.
> In this case, we need specially handling for the first
> thermal_zone_device_update().
>
> Both thermal core framework and step_wise governor is
> enhanced to handle this.
It may be worth pointing out that the step_wise governor is the only
one that uses trends, so it's the only thermal governor that needs to
be updated.
> CC: <stable@xxxxxxxxxxxxxxx> #3.18+
> Tested-by: Manuel Krause <manuelkrause@xxxxxxxxxxxx>
> Tested-by: szegad <szegadlo@xxxxxxxxxxxxxx>
> Tested-by: prash <prash.n.rao@xxxxxxxxx>
> Tested-by: amish <ammdispose-arch@xxxxxxxxx>
> Tested-by: Matthias <morpheusxyz123@xxxxxxxx>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
One minor nit below, other than that,
Reviewed-by: Javi Merino <javi.merino@xxxxxxx>
> ---
> drivers/thermal/step_wise.c | 18 ++++++++++++++++--
> drivers/thermal/thermal_core.c | 19 +++++++++++++++++--
> drivers/thermal/thermal_core.h | 1 +
> include/linux/thermal.h | 3 +++
> 4 files changed, 37 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
> index 2f9f708..405de04 100644
> --- a/drivers/thermal/step_wise.c
> +++ b/drivers/thermal/step_wise.c
> @@ -63,6 +63,19 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> next_target = instance->target;
> dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);
>
> + if (!instance->initialized) {
> + if (throttle) {
> + next_target = (cur_state + 1) >= instance->upper ?
> + instance->upper :
> + ((cur_state + 1) < instance->lower ?
> + instance->lower : (cur_state + 1));
> + } else {
> + next_target = THERMAL_NO_TARGET;
> + }
> +
> + return next_target;
> + }
> +
> switch (trend) {
> case THERMAL_TREND_RAISING:
> if (throttle) {
> @@ -149,7 +162,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
> dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
> old_target, (int)instance->target);
>
> - if (old_target == instance->target)
> + if (instance->initialized &&
> + old_target == instance->target)
nit: it fits in one line,
if (instance->initialized && old_target == instance->target)
is 77 characters.
Cheers,
Javi
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