#!/bin/bash
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# defines
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FREQ=0 #percent
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SERVICES=(perfd thermal-engine mpdecision)
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DIR="/sys/devices/system/cpu"
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###################### SETUP ######################
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# helper functions
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fileexists() {
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[ `adb shell "[ -f $1 ] && echo 1 || echo 0" | tr -d '\r'` -eq 1 ]
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}
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getprop() {
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if fileexists $1; then
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echo `adb shell cat $1 | tr -d '\r'`
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else
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echo "FILE $1 NOT FOUND"
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fi
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}
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setprop() {
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if fileexists $1; then
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adb shell "echo -n $2 > $1"
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else
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echo "FILE $1 NOT FOUND"
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fi
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}
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# use passed in percent frequency
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if [[ $# -eq 1 ]]; then
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FREQ=$1
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fi
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# switch to root
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if [[ "`adb shell id | tr -d '\r' | awk -F'[()]' '{print $2}'`" != "root" ]]; then
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adb root
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adb wait-for-device
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fi
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# device name
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echo Device: `adb shell getprop ro.product.model`
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echo
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# collect all cores
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cores=`adb shell ls /sys/devices/system/cpu/ | grep cpu[0-9].* | tr -d '\r'`
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# disable GPU
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adb shell setprop debug.rs.default-CPU-driver 1
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###################### CONFIGURE ######################
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# freeze system
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for service in ${SERVICES[@]}; do
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adb shell stop $service
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done
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# set frequencies
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declare -A selectedFreq
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for core in $cores; do
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# turn on core if possible
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if fileexists $DIR/$core/online; then
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adb shell "echo -n 1 > $DIR/$core/online"
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fi
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# get available frequencies in sorted order
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if fileexists $DIR/$core/cpufreq/scaling_available_frequencies; then
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frequencies=(`getprop $DIR/$core/cpufreq/scaling_available_frequencies`)
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elif fileexists $DIR/$core/cpufreq/stats/time_in_state; then
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frequencies=(`adb shell cat $DIR/$core/cpufreq/stats/time_in_state | cut -f1 -d " " | tr -d '\r'`)
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fi
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frequencies=(`printf "%s\n" "${frequencies[@]}" | sort -n`)
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# find target frequency based on frequency percentage
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minFreq=${frequencies[0]}
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maxFreq=${frequencies[-1]}
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targetFreq=$(( FREQ * ( maxFreq - minFreq ) / 100 + minFreq ))
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# find closest frequency
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freq=`printf "%d\n" "${frequencies[@]}" | awk -v c=${frequencies[0]} -v t=$targetFreq 'BEGIN{d=$0-t;if(d<0)d=-d;l=d}{d=$0-t;if(d<0)d=-d;if(d<l){l=d;c=$0}}END{print c}'`
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selectedFreq[$core]=$freq
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# set frequency
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adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_min_freq"
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adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_max_freq"
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done
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# keep trying until the frequencies are properly set
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while true; do
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# check to see if frequencies are correct
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CORRECT=true
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for core in $cores; do
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if fileexists $DIR/$core/online && [ `getprop $DIR/$core/online` -eq 0 ]; then
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echo "$core is offline"
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CORRECT=false
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else
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if fileexists $DIR/$core/cpufreq/scaling_cur_freq; then
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frequency=`getprop $DIR/$core/cpufreq/scaling_cur_freq`
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if [ $frequency != ${selectedFreq[$core]} ]; then
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echo "$core: $frequency != ${selectedFreq[$core]}"
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CORRECT=false
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fi
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else
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echo "$core is offline"
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CORRECT=false
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fi
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fi
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done
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# finished
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if [ $CORRECT == "true" ]; then
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break
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fi
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# display
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echo "Frequencies not properly set. Trying again..."
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# unfreeze system
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for service in ${SERVICES[@]}; do
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adb shell start $service
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done
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# wait for changes to be made
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sleep 1
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# freeze system
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for service in ${SERVICES[@]}; do
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adb shell stop $service
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done
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# try resetting the values (only really needed for Nexus 7 for some reason)
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for core in $cores; do
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if fileexists $DIR/$core/online; then
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adb shell "echo -n 1 > $DIR/$core/online"
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fi
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adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_min_freq"
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adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_max_freq"
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done
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sleep 1
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done
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# display
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for core in $cores; do
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echo "$core successfully set to ${selectedFreq[$core]}"
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done
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