intel_pstate: provide option to only use intel_pstate with HWP

Allow users the option to disable the driver for any hardware
which does not support HWP.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4df73da..07e6701 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1469,6 +1469,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                       no_hwp
                         Do not enable hardware P state control (HWP)
                         if available.
+               hwp_only
+                       Only load intel_pstate on systems which support
+                       hardware P state control (HWP) if available.
 
        intremap=       [X86-64, Intel-IOMMU]
                        on      enable Interrupt Remapping (default)

diff --cc drivers/cpufreq/intel_pstate.c
Simple merge