intel_pstate: provide option to only use intel_pstate with HWP

[cascardo/linux.git] / drivers / cpufreq / intel_pstate.c

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index e7e808d..872c577 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1019,6 +1019,7 @@ static struct cpufreq_driver intel_pstate_driver = {
 
 static int __initdata no_load;
 static int __initdata no_hwp;
+static int __initdata hwp_only;
 static unsigned int force_load;
 
 static int intel_pstate_msrs_not_valid(void)
@@ -1216,6 +1217,9 @@ static int __init intel_pstate_init(void)
        if (cpu_has(c,X86_FEATURE_HWP) && !no_hwp)
                intel_pstate_hwp_enable();
 
+       if (!hwp_active && hwp_only)
+               goto out;
+
        rc = cpufreq_register_driver(&intel_pstate_driver);
        if (rc)
                goto out;
@@ -1250,6 +1254,8 @@ static int __init intel_pstate_setup(char *str)
                no_hwp = 1;
        if (!strcmp(str, "force"))
                force_load = 1;
+       if (!strcmp(str, "hwp_only"))
+               hwp_only = 1;
        return 0;
 }
 early_param("intel_pstate", intel_pstate_setup);