#!/bin/bash
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DMC_PATH=/sys/class/devfreq/dmc
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if [ ! -e "$DMC_PATH" ];then
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echo "non-existent dmc path, please check if dmc enabled"
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exit
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fi
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set_ddr_freq() {
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echo userspace > $DMC_PATH/governor
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echo $1 > $DMC_PATH/userspace/set_freq
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cur=$(cat $DMC_PATH/cur_freq)
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if [ "$cur" -eq "$1" ];then
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echo "ddr freq: success change to $cur Hz"
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else
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echo "ddr freq: failed change to $1 HZ, now $cur Hz"
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exit
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fi
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}
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if [ "$#" -eq "1" ];then
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read -a array < $DMC_PATH/available_frequencies
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let j=${#array[@]}-1
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for i in `seq 0 $j`; do
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if [ "$1" -eq "${array[$i]}" ];then
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set_ddr_freq $1
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exit
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fi
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done
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echo "ddr freq: $1 is not in available frequencies: "${array[*]}""
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echo "ddr freq: now $(cat $DMC_PATH/cur_freq) Hz"
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else
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cnt=0
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read -a FREQS < $DMC_PATH/available_frequencies
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RANDOM=$$$(date +%s)
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while true; do
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echo userspace > $DMC_PATH/governor
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FREQ=${FREQS[$RANDOM % ${#FREQS[@]} ]}
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echo -n "cnt: $cnt, "
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set_ddr_freq ${FREQ}
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let "cnt=$cnt+1"
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done
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fi
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