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author | Chanwoo Choi <cw00.choi@samsung.com> | 2017-10-23 10:32:06 +0900 |
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committer | MyungJoo Ham <myungjoo.ham@samsung.com> | 2017-10-26 17:08:40 +0900 |
commit | ab8f58ad72c4d1abe59216362ddb8bfa428c9071 (patch) | |
tree | cf29661b1dde3436107fcb1b7e40c3b86c37eb89 /drivers/devfreq | |
parent | bb176f67090ca54869fc1262c913aa69d2ede070 (diff) | |
download | linux-ab8f58ad72c4d1abe59216362ddb8bfa428c9071.tar.gz linux-ab8f58ad72c4d1abe59216362ddb8bfa428c9071.tar.bz2 linux-ab8f58ad72c4d1abe59216362ddb8bfa428c9071.zip |
PM / devfreq: Set min/max_freq when adding the devfreq device
Prior to that, the min/max_freq of the devfreq device are always zero
before the user changes the min/max_freq through sysfs entries.
It might make the confusion for the min/max_freq.
This patch initializes the available min/max_freq by using the OPP
during adding the devfreq device.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r-- | drivers/devfreq/devfreq.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index a1c4ee818614..6a6f88bccdee 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -69,6 +69,34 @@ static struct devfreq *find_device_devfreq(struct device *dev) return ERR_PTR(-ENODEV); } +static unsigned long find_available_min_freq(struct devfreq *devfreq) +{ + struct dev_pm_opp *opp; + unsigned long min_freq = 0; + + opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); + if (IS_ERR(opp)) + min_freq = 0; + else + dev_pm_opp_put(opp); + + return min_freq; +} + +static unsigned long find_available_max_freq(struct devfreq *devfreq) +{ + struct dev_pm_opp *opp; + unsigned long max_freq = ULONG_MAX; + + opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); + if (IS_ERR(opp)) + max_freq = 0; + else + dev_pm_opp_put(opp); + + return max_freq; +} + /** * devfreq_get_freq_level() - Lookup freq_table for the frequency * @devfreq: the devfreq instance @@ -559,6 +587,20 @@ struct devfreq *devfreq_add_device(struct device *dev, mutex_lock(&devfreq->lock); } + devfreq->min_freq = find_available_min_freq(devfreq); + if (!devfreq->min_freq) { + mutex_unlock(&devfreq->lock); + err = -EINVAL; + goto err_dev; + } + + devfreq->max_freq = find_available_max_freq(devfreq); + if (!devfreq->max_freq) { + mutex_unlock(&devfreq->lock); + err = -EINVAL; + goto err_dev; + } + dev_set_name(&devfreq->dev, "devfreq%d", atomic_inc_return(&devfreq_no)); err = device_register(&devfreq->dev); |