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This file documents NVIDIA Tegra specific sysfs and debugfs files and
kernel module parameters.
/sys/power/suspend/mode
-----------------------
Used to select the LP1 or LP0 power state during system suspend.
# echo lp0 > /sys/kernel/debug/suspend_mode
# echo lp1 > /sys/kernel/debug/suspend_mode
/sys/module/cpuidle/parameters/power_down_in_idle
------------------------------------------
Used to enable/disable CPU power down in idle.
# echo 1 > /sys/module/cpuidle/parameters/power_down_in_idle
# echo 0 > /sys/module/cpuidle/parameters/power_down_in_idle
/sys/kernel/debug/cpuidle/power_down_stats
-----------------------------
Contains CPU power down statistics.
# cat /sys/kernel/debug/cpuidle/power_down_stats
/sys/kernel/debug/powergate
---------------------------
Contains power gating state of different tegra blocks.
# cat /sys/kernel/debug/powergate
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
------------------------------------------------------
Control hotplugging of cores.
# echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
# echo 1 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
Cpuquiet supports the implementation of multiple policies in the form of
governors. The balanced governor implements the exact same policy previously
implemented as "auto hotplug". The behavior with regards to cores coming
online/offline and switching between the LP and G cluster remain the same.
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/no_lp
-----------------------------------------------------
Enable/disable shadow cluster.
# echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/no_lp
# echo 1 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/no_lp
/sys/devices/system/cpu/cpuquiet/available_governors
----------------------------------------------------
List available governors.
# cat /sys/devices/system/cpu/cpuquiet/available_governors
/sys/devices/system/cpu/cpuquiet/current_governor
-------------------------------------------------
Set the current active cpuquiet governor.
# echo [governor name] > /sys/devices/system/cpu/cpuquiet/current_governor
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/idle_bottom_freq
----------------------------------------------------------------
Main cluster minimum frequency.
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/idle_top_freq
-------------------------------------------------------------
Shadow cluster maximum frequency.
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/down_delay
----------------------------------------------------------
Delay (in jiffies) for switching to shadow cluster.
/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/up_delay
--------------------------------------------------------
Delay for switching to main cluster.
/sys/devices/system/cpu/cpuquiet/balanced/balance_level
-------------------------------------------------------
Percentage of max speed considered to be in balance. Half of balanced
speed is considered skewed. Requires balanced governor to be set active.
/sys/devices/system/cpu/cpuquiet/balanced/down_delay
----------------------------------------------------
Delay for reducing cores. Requires balanced governor to be set active.
/sys/devices/system/cpu/cpuquiet/balanced/up_delay
--------------------------------------------------
Delay for bringing additional cores online in main cluster. Requires
balanced governor to be set active.
/sys/kernel/debug/tegra_hotplug/stats
-------------------------------------
Contains hotplug statistics.
/sys/kernel/cluster/active
--------------------------
Controls active CPU cluster: main (G) or shadow (LP).
For manual control disable auto hotlug, enable immediate switch and
possibly force switch to happen always:
# echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
# echo 1 > /sys/kernel/cluster/immediate
# echo 1 > /sys/kernel/cluster/force
Cluster switching can happen only when only core 0 is online.
Active cluster can be set or toggled:
# echo "G" > /sys/kernel/cluster/active
# echo "LP" > /sys/kernel/cluster/active
# echo "toggle" > /sys/kernel/cluster/active
/sys/module/tegra*_clocks/parameters/detach_shared_bus
------------------------------------------------------
Enable/disable shared bus clock update. Module name depends on Tegra
chip version.
/sys/module/tegra*_emc/parameters/emc_enable
--------------------------------------------
Enable/disable EMC DFS. Module name depends on Tegra chip version.
/sys/kernel/debug/tegra_emc/stats
---------------------------------
Contains EMC clock statistics.
/sys/module/tegra*_dvfs/parameters/disable_cpu
----------------------------------------------
Enable/disable DVFS for CPU domain. Module name depends on Tegra chip
version.
/sys/module/tegra*_dvfs/parameters/disable_core
-----------------------------------------------
Enable/disable DVFS for CORE domain. Module name depends on Tegra chip
version.
/sys/kernel/debug/clock/emc/rate
--------------------------------
Get/set EMC clock rate.
/sys/kernel/debug/clock/<module>/rate
-------------------------------------
/sys/kernel/debug/clock/<module>/parent
---------------------------------------
/sys/kernel/debug/clock/<module>/state
--------------------------------------
/sys/kernel/debug/clock/<module>/time_on
----------------------------------------
/sys/kernel/debug/clock/clock_tree
----------------------------------
Shows the state of the clock tree.
/sys/kernel/debug/clock/dvfs
----------------------------
Contains voltage state.
/sys/kernel/debug/tegra_actmon/avp/state
----------------------------------------
/sys/kernel/debug/clock/mon.avp/rate
------------------------------------
/sys/kernel/debug/clock/rails
-----------------------------
Contains the time at each voltage.
/sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state
--------------------------------------------------------
Contains the time at each frequency.
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