Messages in this thread Patch in this message | | | From | Chanwoo Choi <> | Subject | [PATCH 08/12] PM / devfreq: Show the available min/max frequency through sysfs node | Date | Thu, 24 Aug 2017 10:42:55 +0900 |
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The existing {min|max}_freq sysfs nodes don't consider whether min/max_freq are available or not. Those sysfs nodes show just the stored value in the struct devfreq.
The devfreq uses the OPP interface and then dev_pm_opp_{disable|add}() might change the state of the device's supported frequency. This patch shows the available minimum and maximum frequency through sysfs node.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> --- drivers/devfreq/devfreq.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index be3d42f140ff..8b0bbfa0a50b 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1148,7 +1148,14 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%lu\n", to_devfreq(dev)->min_freq); + struct devfreq *df = to_devfreq(dev); + unsigned long min_freq = to_devfreq(dev)->min_freq; + unsigned long available_min_freq = find_available_min_freq(df); + + if (available_min_freq != 0 && min_freq < available_min_freq) + min_freq = available_min_freq; + + return sprintf(buf, "%lu\n", min_freq); } static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, @@ -1186,7 +1193,14 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%lu\n", to_devfreq(dev)->max_freq); + struct devfreq *df = to_devfreq(dev); + unsigned long max_freq = to_devfreq(dev)->max_freq; + unsigned long available_max_freq = find_available_max_freq(df); + + if (available_max_freq != 0 && max_freq > available_max_freq) + max_freq = available_max_freq; + + return sprintf(buf, "%lu\n", max_freq); } static DEVICE_ATTR_RW(max_freq); -- 1.9.1
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