cpufreq: intel_pstate: Eliminate intel_pstate_get_min_max()

Some computations in intel_pstate_get_min_max() are not necessary
and one of its two callers doesn't even use the full result.

First off, the fixed-point value of cpu->max_perf represents a
non-negative number between 0 and 1 inclusive and cpu->min_perf
cannot be greater than cpu->max_perf.  It is not necessary to check
those conditions every time the numbers in question are used.

Moreover, since intel_pstate_max_within_limits() only needs the
upper boundary, it doesn't make sense to compute the lower one in
there and returning min and max from intel_pstate_get_min_max()
via pointers doesn't look particularly nice.

For the above reasons, drop intel_pstate_get_min_max(), add a helper
to get the base P-state for min/max computations and carry out them
directly in the previous callers of intel_pstate_get_min_max().

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

1 files changed, 14 insertions, 26 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 5236701958d0..b62daf5a4ee8 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1496,26 +1496,10 @@ static int knl_get_turbo_pstate(void)
         return ret;
 }
 
-static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
+static int intel_pstate_get_base_pstate(struct cpudata *cpu)
 {
-        int max_perf = cpu->pstate.turbo_pstate;
-        int max_perf_adj;
-        int min_perf;
-
-        if (global.no_turbo || global.turbo_disabled)
-                max_perf = cpu->pstate.max_pstate;
-
-        /*
-         * performance can be limited by user through sysfs, by cpufreq
-         * policy, or by cpu specific default values determined through
-         * experimentation.
-         */
-        max_perf_adj = fp_ext_toint(max_perf * cpu->max_perf);
-        *max = clamp_t(int, max_perf_adj,
-                        cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
-
-        min_perf = fp_ext_toint(max_perf * cpu->min_perf);
-        *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
+        return global.no_turbo || global.turbo_disabled ?
+                        cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
 }
 
 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
@@ -1538,11 +1522,13 @@ static void intel_pstate_set_min_pstate(struct cpudata *cpu)
 
 static void intel_pstate_max_within_limits(struct cpudata *cpu)
 {
-        int min_pstate, max_pstate;
+        int pstate;
 
         update_turbo_state();
-        intel_pstate_get_min_max(cpu, &min_pstate, &max_pstate);
-        intel_pstate_set_pstate(cpu, max_pstate);
+        pstate = intel_pstate_get_base_pstate(cpu);
+        pstate = max(cpu->pstate.min_pstate,
+                     fp_ext_toint(pstate * cpu->max_perf));
+        intel_pstate_set_pstate(cpu, pstate);
 }
 
 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
@@ -1704,11 +1690,13 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
 
 static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
 {
-        int max_perf, min_perf;
+        int max_pstate = intel_pstate_get_base_pstate(cpu);
+        int min_pstate;
 
-        intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
-        pstate = clamp_t(int, pstate, min_perf, max_perf);
-        return pstate;
+        min_pstate = max(cpu->pstate.min_pstate,
+                         fp_ext_toint(max_pstate * cpu->min_perf));
+        max_pstate = max(min_pstate, fp_ext_toint(max_pstate * cpu->max_perf));
+        return clamp_t(int, pstate, min_pstate, max_pstate);
 }
 
 static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)