Merge branch 'pm-tools'

[sfrench/cifs-2.6.git] / drivers / cpufreq / intel_pstate.c

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index eb1158532de31e7aee418162135a7495b10f9860..029a93bfb5581af78dfbe4e0be20e3aea22cdf61 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -653,6 +653,12 @@ static const char * const energy_perf_strings[] = {
        "power",
        NULL
 };
+static const unsigned int epp_values[] = {
+       HWP_EPP_PERFORMANCE,
+       HWP_EPP_BALANCE_PERFORMANCE,
+       HWP_EPP_BALANCE_POWERSAVE,
+       HWP_EPP_POWERSAVE
+};
 
 static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
 {
@@ -664,17 +670,14 @@ static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
                return epp;
 
        if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
-               /*
-                * Range:
-                *      0x00-0x3F       :       Performance
-                *      0x40-0x7F       :       Balance performance
-                *      0x80-0xBF       :       Balance power
-                *      0xC0-0xFF       :       Power
-                * The EPP is a 8 bit value, but our ranges restrict the
-                * value which can be set. Here only using top two bits
-                * effectively.
-                */
-               index = (epp >> 6) + 1;
+               if (epp == HWP_EPP_PERFORMANCE)
+                       return 1;
+               if (epp <= HWP_EPP_BALANCE_PERFORMANCE)
+                       return 2;
+               if (epp <= HWP_EPP_BALANCE_POWERSAVE)
+                       return 3;
+               else
+                       return 4;
        } else if (static_cpu_has(X86_FEATURE_EPB)) {
                /*
                 * Range:
@@ -712,15 +715,8 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
 
                value &= ~GENMASK_ULL(31, 24);
 
-               /*
-                * If epp is not default, convert from index into
-                * energy_perf_strings to epp value, by shifting 6
-                * bits left to use only top two bits in epp.
-                * The resultant epp need to shifted by 24 bits to
-                * epp position in MSR_HWP_REQUEST.
-                */
                if (epp == -EINVAL)
-                       epp = (pref_index - 1) << 6;
+                       epp = epp_values[pref_index - 1];
 
                value |= (u64)epp << 24;
                ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value);