Merge tag 'amd-pstate-v6.14-2025-01-07' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux

Merge amd-pstate changes for 6.14 from Mario Limonciello:

"Fix a regression with preferred core rankings not being used.
 Fix a precision issue with frequency calculation."

* tag 'amd-pstate-v6.14-2025-01-07' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux:
  cpufreq/amd-pstate: Refactor max frequency calculation
  cpufreq/amd-pstate: Fix prefcore rankings

Author: rafaeljw

drivers/cpufreq/amd-pstate.c

@@ -815,7 +815,7 @@ static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
 	 * sched_set_itmt_support(true) has been called and it is valid to
 	 * update them at any time after it has been called.
 	 */
-	sched_set_itmt_core_prio((int)READ_ONCE(cpudata->highest_perf), cpudata->cpu);
+	sched_set_itmt_core_prio((int)READ_ONCE(cpudata->prefcore_ranking), cpudata->cpu);
 
 	schedule_work(&sched_prefcore_work);
 }
@@ -908,9 +908,8 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
 {
 	int ret;
 	u32 min_freq, max_freq;
-	u32 nominal_perf, nominal_freq;
+	u32 highest_perf, nominal_perf, nominal_freq;
 	u32 lowest_nonlinear_perf, lowest_nonlinear_freq;
-	u32 boost_ratio, lowest_nonlinear_ratio;
 	struct cppc_perf_caps cppc_perf;
 
 	ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf);
@@ -927,16 +926,12 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
 	else
 		nominal_freq = cppc_perf.nominal_freq;
 
+	highest_perf = READ_ONCE(cpudata->highest_perf);
 	nominal_perf = READ_ONCE(cpudata->nominal_perf);
-
-	boost_ratio = div_u64(cpudata->highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
-	max_freq = (nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT);
+	max_freq = div_u64((u64)highest_perf * nominal_freq, nominal_perf);
 
 	lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
-	lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << SCHED_CAPACITY_SHIFT,
-					 nominal_perf);
-	lowest_nonlinear_freq = (nominal_freq * lowest_nonlinear_ratio >> SCHED_CAPACITY_SHIFT);
-
+	lowest_nonlinear_freq = div_u64((u64)nominal_freq * lowest_nonlinear_perf, nominal_perf);
 	WRITE_ONCE(cpudata->min_freq, min_freq * 1000);
 	WRITE_ONCE(cpudata->lowest_nonlinear_freq, lowest_nonlinear_freq * 1000);
 	WRITE_ONCE(cpudata->nominal_freq, nominal_freq * 1000);