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Date: Wed, 30 Dec 2015 14:12:30 +0800 From: Leo Yan <leo.yan@...aro.org> To: Zhang Rui <rui.zhang@...el.com>, Eduardo Valentin <edubezval@...il.com>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, Javi Merino <javi.merino@....com> Cc: Leo Yan <leo.yan@...aro.org> Subject: [PATCH] thermal: re-calculate k_po/k_pu when update sustainable power 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@...aro.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..212688a 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->kpo * sustainable_power) / old_val; + tz->tzp->k_pu = (tz->tzp->kpu * sustainable_power) / old_val; return count; } static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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