cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.

When intel_pstate is configured into the kernel it will become the
preferred scaling driver for processors that it supports.  Allow the
user to override this by adding:
   intel_pstate=disable
on the kernel command line.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 363e348bff9b..b335c456feb9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1131,6 +1131,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         0       disables intel_idle and fall back on acpi_idle.
                         1 to 6  specify maximum depth of C-state.
 
+        intel_pstate=  [X86]
+                       disable
+                         Do not enable intel_pstate as the default
+                         scaling driver for the supported processors
+
         intremap=       [X86-64, Intel-IOMMU]
                         on      enable Interrupt Remapping (default)
                         off     disable Interrupt Remapping