intel_pstate: fix PCT_TO_HWP macro

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

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 63075cc..27faee5 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -260,24 +260,31 @@ static inline void update_turbo_state(void)
                 cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
 }
 
-#define PCT_TO_HWP(x) (x * 255 / 100)
 static void intel_pstate_hwp_set(void)
 {
-       int min, max, cpu;
-       u64 value, freq;
+       int min, hw_min, max, hw_max, cpu, range, adj_range;
+       u64 value, cap;
+
+       rdmsrl(MSR_HWP_CAPABILITIES, cap);
+       hw_min = HWP_LOWEST_PERF(cap);
+       hw_max = HWP_HIGHEST_PERF(cap);
+       range = hw_max - hw_min;
 
        get_online_cpus();
 
        for_each_online_cpu(cpu) {
                rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
-               min = PCT_TO_HWP(limits.min_perf_pct);
+               adj_range = limits.min_perf_pct * range / 100;
+               min = hw_min + adj_range;
                value &= ~HWP_MIN_PERF(~0L);
                value |= HWP_MIN_PERF(min);
 
-               max = PCT_TO_HWP(limits.max_perf_pct);
+               adj_range = limits.max_perf_pct * range / 100;
+               max = hw_min + adj_range;
                if (limits.no_turbo) {
-                       rdmsrl( MSR_HWP_CAPABILITIES, freq);
-                       max = HWP_GUARANTEED_PERF(freq);
+                       hw_max = HWP_GUARANTEED_PERF(cap);
+                       if (hw_max < max)
+                               max = hw_max;
                }
 
                value &= ~HWP_MAX_PERF(~0L);