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    Subject[PATCH v2] thermal: re-calculate k_po/k_pu when update sustainable power
    Date
    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.yan@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;
    return count;
    }
    static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
    --
    1.9.1


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