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init.qcom.post_boot: Offline CPU5-7 before disabling thermal hotplug 

post_boot script is also executed during framework reboot, where all
A57s might be online running at max frequency. Disabling thermal
hotplug then could lead into thermal runaway.

Explicitly offline CPU 5-7 to make sure at most one A57 is online, and
limit its frequency to 960MHz when thermal hotplug is disabled.

Change-Id: I53b7541348ba0b14303006dba4b3c21770d36225
This commit is contained in:
Junjie Wu 2014-11-23 15:02:37 -08:00
parent fc7d402fd7
commit 8c2c925e3a
1 changed files with 8 additions and 0 deletions
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8
rootdir/etc/init.qcom.post_boot.sh
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@ -744,6 +744,12 @@ esac
case "$target" in
"msm8994")
# ensure at most one A57 is online when thermal hotplug is disabled
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu6/online
echo 0 > /sys/devices/system/cpu/cpu7/online
# in case CPU4 is online, limit its frequency
echo 960000 > /sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq
# disable thermal bcl hotplug to switch governor
echo 0 > /sys/module/msm_thermal/core_control/enabled
echo -n disable > /sys/devices/soc.*/qcom,bcl.*/mode
@ -779,6 +785,8 @@ case "$target" in
echo 40000 > /sys/devices/system/cpu/cpu4/cpufreq/interactive/min_sample_time
echo 80000 > /sys/devices/system/cpu/cpu4/cpufreq/interactive/max_freq_hysteresis
echo 384000 > /sys/devices/system/cpu/cpu4/cpufreq/scaling_min_freq
# restore A57's max
cat /sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_max_freq > /sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq
# re-enable thermal and BCL hotplug
echo 1 > /sys/module/msm_thermal/core_control/enabled
echo -n disable > /sys/devices/soc.*/qcom,bcl.*/mode