diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/devfreq/governor_simpleondemand.c')
-rw-r--r-- | ANDROID_3.4.5/drivers/devfreq/governor_simpleondemand.c | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/ANDROID_3.4.5/drivers/devfreq/governor_simpleondemand.c b/ANDROID_3.4.5/drivers/devfreq/governor_simpleondemand.c deleted file mode 100644 index a2e3eae7..00000000 --- a/ANDROID_3.4.5/drivers/devfreq/governor_simpleondemand.c +++ /dev/null @@ -1,94 +0,0 @@ -/* - * linux/drivers/devfreq/governor_simpleondemand.c - * - * Copyright (C) 2011 Samsung Electronics - * MyungJoo Ham <myungjoo.ham@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/errno.h> -#include <linux/devfreq.h> -#include <linux/math64.h> - -/* Default constants for DevFreq-Simple-Ondemand (DFSO) */ -#define DFSO_UPTHRESHOLD (90) -#define DFSO_DOWNDIFFERENCTIAL (5) -static int devfreq_simple_ondemand_func(struct devfreq *df, - unsigned long *freq) -{ - struct devfreq_dev_status stat; - int err = df->profile->get_dev_status(df->dev.parent, &stat); - unsigned long long a, b; - unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD; - unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL; - struct devfreq_simple_ondemand_data *data = df->data; - unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX; - - if (err) - return err; - - if (data) { - if (data->upthreshold) - dfso_upthreshold = data->upthreshold; - if (data->downdifferential) - dfso_downdifferential = data->downdifferential; - } - if (dfso_upthreshold > 100 || - dfso_upthreshold < dfso_downdifferential) - return -EINVAL; - - /* Assume MAX if it is going to be divided by zero */ - if (stat.total_time == 0) { - *freq = max; - return 0; - } - - /* Prevent overflow */ - if (stat.busy_time >= (1 << 24) || stat.total_time >= (1 << 24)) { - stat.busy_time >>= 7; - stat.total_time >>= 7; - } - - /* Set MAX if it's busy enough */ - if (stat.busy_time * 100 > - stat.total_time * dfso_upthreshold) { - *freq = max; - return 0; - } - - /* Set MAX if we do not know the initial frequency */ - if (stat.current_frequency == 0) { - *freq = max; - return 0; - } - - /* Keep the current frequency */ - if (stat.busy_time * 100 > - stat.total_time * (dfso_upthreshold - dfso_downdifferential)) { - *freq = stat.current_frequency; - return 0; - } - - /* Set the desired frequency based on the load */ - a = stat.busy_time; - a *= stat.current_frequency; - b = div_u64(a, stat.total_time); - b *= 100; - b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2)); - *freq = (unsigned long) b; - - if (df->min_freq && *freq < df->min_freq) - *freq = df->min_freq; - if (df->max_freq && *freq > df->max_freq) - *freq = df->max_freq; - - return 0; -} - -const struct devfreq_governor devfreq_simple_ondemand = { - .name = "simple_ondemand", - .get_target_freq = devfreq_simple_ondemand_func, -}; |