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Documentation: intel_pstate: PID tuning is not always available 

PID tuning is not available when the get_target_pstate_use_cpu_load()
is used to calculate target_state. So update the documentation.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Srinivas Pandruvada 2016-10-20 13:37:06 -07:00 committed by Rafael J. Wysocki
parent 185d82456e
commit b8b97a4252
1 changed files with 5 additions and 4 deletions
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9
Documentation/cpu-freq/intel-pstate.txt
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@ -122,11 +122,12 @@ will run at is selected by the processor itself.
Tuning Intel P-State driver Tuning Intel P-State driver
When HWP mode is not used, debugfs files have also been added to allow the When the performance can be tuned using PID (Proportional Integral
tuning of the internal governor algorithm. These files are located at Derivative) controller, debugfs files are provided for adjusting performance.
/sys/kernel/debug/pstate_snb/. The algorithm uses a PID (Proportional They are presented under:
Integral Derivative) controller. The PID tunable parameters are: /sys/kernel/debug/pstate_snb/
The PID tunable parameters are:
deadband deadband
d_gain_pct d_gain_pct
i_gain_pct i_gain_pct