[PATCH 1/3] PM / devfreq: set min/max freq limit from freq table
From: Rajagopal Venkat <hidden>
Date: 2013-01-08 05:54:35
Also in:
lkml
Subsystem:
device frequency (devfreq), the rest · Maintainers:
MyungJoo Ham, Kyungmin Park, Chanwoo Choi, Linus Torvalds
Set devfreq device min and max frequency limits when device is added to devfreq, provided frequency table is supplied. This helps governors to suggest target frequency with in limits. Signed-off-by: Rajagopal Venkat <redacted> --- drivers/devfreq/devfreq.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a8f0173..5782c9b 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c@@ -69,6 +69,29 @@ static struct devfreq *find_device_devfreq(struct device *dev) } /** + * devfreq_set_freq_limits() - Set min and max frequency from freq_table + * @devfreq: the devfreq instance + */ +static void devfreq_set_freq_limits(struct devfreq *devfreq) +{ + int idx; + unsigned long min = ~0, max = 0; + + if (!devfreq->profile->freq_table) + return; + + for (idx = 0; idx < devfreq->profile->max_state; idx++) { + if (min > devfreq->profile->freq_table[idx]) + min = devfreq->profile->freq_table[idx]; + if (max < devfreq->profile->freq_table[idx]) + max = devfreq->profile->freq_table[idx]; + } + + devfreq->min_freq = min; + devfreq->max_freq = max; +} + +/** * devfreq_get_freq_level() - Lookup freq_table for the frequency * @devfreq: the devfreq instance * @freq: the target frequency
@@ -476,6 +499,7 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->profile->max_state, GFP_KERNEL); devfreq->last_stat_updated = jiffies; + devfreq_set_freq_limits(devfreq); dev_set_name(&devfreq->dev, dev_name(dev)); err = device_register(&devfreq->dev);
--
1.7.10.4