On Wed, Dec 30, 2015 at 06:38:40PM +0800, Leo Yan wrote:
> k_po/k_pu are in essence ratio values compared with sustainable power.
> So when update sustainable power, we can recalculate k_po/k_pu simply
> with below formula:
>
> sustainable_power(new)
> k_p(new) = ---------------------- * k_p(old)
> sustainable_power(old)
>
> Signed-off-by: Leo Yan <leo....@linaro.org>
> ---
> drivers/thermal/thermal_core.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index d9e525c..223f8df 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -908,7 +908,7 @@ sustainable_power_store(struct device *dev, struct
> device_attribute *devattr,
> const char *buf, size_t count)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> - u32 sustainable_power;
> + u32 sustainable_power, old_val;
>
> if (!tz->tzp)
> return -EIO;
> @@ -916,8 +916,12 @@ sustainable_power_store(struct device *dev, struct
> device_attribute *devattr,
> if (kstrtou32(buf, 10, &sustainable_power))
> return -EINVAL;
>
> + old_val = tz->tzp->sustainable_power;
> +
> tz->tzp->sustainable_power = sustainable_power;
>
> + tz->tzp->k_po = (tz->tzp->k_po * sustainable_power) / old_val;
> + tz->tzp->k_pu = (tz->tzp->k_pu * sustainable_power) / old_val;
I believe this has to be done by the governor. These properties are
power_allocator specific. thermal_core should not really care about
them.
> return count;
> }
> static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO,
> sustainable_power_show,
> --
> 1.9.1
>
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