Hi Thomas,
On Mon, Nov 24, 2014 at 10:58 AM, Kevin Hilman <[email protected]> wrote:
[...]
> Second, as with earlier versions of this series, I'm still seeing lots
> of "wait_until_divider_stable: timeout in divider stablization" messages
> coming out when running powertop.
I found a simpler way to reproduce these messages. If I simply use
the userspace governor and cycle through all the A7 OPPs, I'll hit
this message (script below[1]). Note that I'm also using my DTS
change that fixes the vdd_arm and vdd_kfc voltages to a voltage that
is high enough for all the OPPs.
Kevin
[1]
#!/bin/sh
cpu=cpu4
reg_name=vdd_kfc
cpu_reg=$(dirname `find /sys/class/regulator/regulator.*/ -name name
-exec grep -l $reg_name {} \;`)
echo $cpu_reg
# Cycle through frequencies (and check voltage)
cd /sys/devices/system/cpu/$cpu/cpufreq
echo userspace > scaling_governor
for freq in `cat scaling_available_frequencies`; do
echo ${freq} > scaling_setspeed
echo -n "current freq: "
cat scaling_cur_freq
echo -n "current voltage: "
cat ${cpu_reg}/microvolts
sleep 1
done
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