[PATCH] docs: admin-guide: Add information about intel_pstate active mode

[Natesh Sharma]

Information about intel_pstate active mode is added in the doc.
This operation mode could be used to set on the hardware when it's
not activated. Status of the mode could be checked from sysfs file
i.e., /sys/devices/system/cpu/intel_pstate/status.
The information is already available in cpu-freq/intel-pstate.txt
documentation.

Link: https://www.kernel.org/doc/Documentation/cpu-freq/intel-pstate.txt

Signed-off-by: Natesh Sharma <nsharma@xxxxxxxxxx>
---
 Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index bbecbd5797a3..10f3c8d1bb46 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2104,6 +2104,14 @@
 			disable
 			  Do not enable intel_pstate as the default
 			  scaling driver for the supported processors
+                        active
+                          Use intel_pstate driver to bypass the scaling governors
+                          layer of cpufreq and provides it own algorithms for p-state
+                          selection. There are two P-state selection algorithms provided
+                          by intel_pstate in the active mode: powersave and performance.
+                          The way they both operate depends on whether or not the hardware
+                          managed P-states (HWP) feature has been enabled in the processor
+                          and possibly on the processor model.
 			passive
 			  Use intel_pstate as a scaling driver, but configure it
 			  to work with generic cpufreq governors (instead of
-- 
2.39.2 (Apple Git-143)