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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/lp2_in_idle
------------------------------------------
Used to enable/disable LP2 in idle.
# echo 1 > /sys/module/cpuidle/parameters/lp2_in_idle
# echo 0 > /sys/module/cpuidle/parameters/lp2_in_idle
/sys/kernel/debug/cpuidle/lp2
-----------------------------
Contains LP2 statistics.
# cat /sys/kernel/debug/cpuidle/lp2
/sys/kernel/debug/powergate
---------------------------
Contains power gating state of different tegra blocks.
# cat /sys/kernel/debug/powergate
/sys/module/cpu_tegra3/parameters/auto_hotplug
----------------------------------------------
Used to control auto hotplug governor
# echo 0 >/sys/module/cpu_tegra3/parameters/auto_hotplug
# echo 1 >/sys/module/cpu_tegra3/parameters/auto_hotplug
# cat /sys/module/cpu_tegra3/parameters/auto_hotplug
0: disabled
1: idle
2: down
3: up
/sys/module/cpu_tegra3/parameters/no_lp
---------------------------------------
Used to enable/disable shadow cluster.
# echo 0 >/sys/module/cpu_tegra3/parameters/no_lp
# echo 1 >/sys/module/cpu_tegra3/parameters/no_lp
/sys/module/cpu_tegra3/parameters/idle_bottom_freq
--------------------------------------------------
Shadow cluster maximum frequency.
/sys/module/cpu_tegra3/parameters/idle_top_freq
-----------------------------------------------
Main cluster minimum frequency.
/sys/module/cpu_tegra3/parameters/down_delay
---------------------------------------------
Auto hotplug delay (in jiffies) for reducing cores.
/sys/module/cpu_tegra3/parameters/up2g0_delay
---------------------------------------------
Delay (in jiffies) for swithing to main cluster.
/sys/module/cpu_tegra3/parameters/up2gn_delay
---------------------------------------------
Delay (in jiffies) for bringing additional cores online in main
cluster.
/sys/module/cpu_tegra3/parameters/balance_level
-----------------------------------------------
Percentage of max speed considered to be in balance. Half of balanced
speed is considered skewed. Speed balance states:
* balanced: freq targets for all CPUs are above 50% of highest speed
* biased: freq target for at least one CPU is below 50% threshold
* skewed: freq targets for at least 2 CPUs are below 25% threshold
Speed balance state and hotplug state dictates auto hotlug behavior.
/sys/module/cpu_tegra3/parameters/mp_overhead
---------------------------------------------
Multi-core overhead percentage for EDP limit calculation.
/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/module/cpu_tegra3/parameters/auto_hotplug
# 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/tegra3_clocks/parameters/detach_shared_bus
------------------------------------------------------
Enable/disable shared bus clock update.
/sys/module/tegra3_emc/parameters/emc_enable
--------------------------------------------
Enable/disable EMC DFS.
/sys/kernel/debug/tegra_emc/stats
---------------------------------
Contains EMC clock statistics.
/sys/module/tegra3_dvfs/parameters/disable_cpu
----------------------------------------------
Enable/disable DVFS for CPU domain.
/sys/module/tegra3_dvfs/parameters/disable_core
-----------------------------------------------
Enable/disable DVFS for CORE domain.
/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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