#!/bin/sh /etc/rc.common

START=99

# ipq806x_power_auto()
#   Changes the governor to ondemand and sets the default parameters for cpu ondemand governor.
#   The parameters are tuned for best performance than for power.
#   Also, the up_thresholds have been set to low value, to workaround the cpu
#   utilization anamolies we are seeing with kcpustat with tickless kernel.
ipq806x_power_auto() {
	echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
	echo "ondemand" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor

	# Change the minimum operating frequency for CPU0.
	# This is required for cases where large amount of network traffic is sent
	# instantaneously  without any ramp-up time , when CPU is at minimum perf level.
	# At 384 MHz, CPU0 stays fully busy in softirq context and doesn't move to ksoftirqd, and
	# doesn't give any other thread including cpufreq thread a chance to run.
	# Hence, the CPU frequency is locked up at 384MHz till the traffic is stopped.
	# Increasing the min frequency for CPU0 to 800 MHz (L2=1GHz), allows 4 Gbps instantaneous
	# traffic without any hangs/lockups.
	#
	# CPU1 min frequency also has to be increased because there is a hardware constraint
	# kraits cannot operate at 384MHz when L2 is at 1GHz.
	#
	# The impact on idle-state power with this change is about ~40-45mW.
	echo "800000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
	echo "800000" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq

	# Change sampling rate for frequency scaling decisions to 1s, from 10 ms
	echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate

	# Change sampling rate for frequency down scaling decision to 10s
	echo 10 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor

	# Change the CPU load threshold above which frequency is up-scaled to
	# turbo frequency,to 50%
	echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
	echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold_any_cpu_load
	echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold_multi_core

	# Change the CPU load threshold below which frequency is down-scaled to
	# 10% (down_threshold = up_threshold - down_differential)
	echo 40 > /sys/devices/system/cpu/cpufreq/ondemand/down_differential

	# Set sync_freq and optimal_freq used for multicore scenarios to max
	# freq
	echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/optimal_freq
	echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/sync_freq
}

# ipq806x_power_turbo()
#   Sets the Krait CPU/L2 and NSS NetAP core clock frequencies to fixed Turbo frequencies
#   No frequency scaling is done in this profile
ipq806x_power_turbo() {
	echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
	echo "userspace" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor

	echo "1400000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
	echo "1400000" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed

	echo 733000000 > /proc/sys/dev/nss/clock/current_freq
}


start() {
	config_load system
	config_get mode powerctl mode "auto"

	if eval "type ipq806x_power_${mode}" 2>/dev/null >/dev/null; then
		eval ipq806x_power_${mode}
	else
		echo "\"${mode}\" power mode not supported"
	fi
}