testcases/cpufreq/avail_freq02.sh

#!/bin/bash
#
# PM-QA validation test suite for the power management on Linux
#
# Copyright (C) 2011, Linaro Limited.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# Contributors:
#     Torez Smith <torez.smith@linaro.org> (IBM Corporation)
#       - initial API and implementation
#

###
 #  Track how much time it takes to cycle through a loop 1000 times at this current frequency
###
loop_it() {
	LOOP_LIMIT=1000
	time while ( test $LOOP_LIMIT -ge 1 ); do
		LOOP_LIMIT=$(( $LOOP_LIMIT - 1 ))
	done
}


###
 #  set governor to be user space governor which allows you to manually alter the frequency
###
echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
if [ $? != 0 ]; then 
	echo "FAIL   could not change governor to userspace, remained `cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor`"
	exit -1
fi


###
 #  Now loop through, changing the cpu frequency to available frequencies. Sleep for a 
 #  period of about 5 seconds each time it's set to a new frequency to allow the system
 #  to settle down.
###
for LOOP_FREQ  in `cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies`
do
	echo $LOOP_FREQ > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
	if [ $? != 0 ]; then 
		echo "FAIL   could not write freq for $LOOP_FREQ"
		exit -1
	fi
	sleep 5
	if [ `cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq` != $LOOP_FREQ ]; then
		echo "FAIL   could not change freq to $LOOP_FREQ  remained  `cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq`"
		exit -1
	fi
	loop_it
done

echo PASS