Commit 8164f743 authored by Meng Li's avatar Meng Li Committed by Rafael J. Wysocki
Browse files

cpufreq: amd-pstate: adjust min/max limit perf 



The min/max limit perf values calculated based on frequency
may exceed the reasonable range of perf(highest perf, lowest perf).

Signed-off-by: default avatarMeng Li <li.meng@amd.com>
Reviewed-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 88debc69

drivers/cpufreq/amd-pstate.c

+14 −1
Original line number Diff line number Diff line
@@ -484,12 +484,19 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy) 


static int amd_pstate_update_min_max_limit(struct cpufreq_policy *policy)

{

	u32 max_limit_perf, min_limit_perf;

	u32 max_limit_perf, min_limit_perf, lowest_perf;

	struct amd_cpudata *cpudata = policy->driver_data;



	max_limit_perf = div_u64(policy->max * cpudata->highest_perf, cpudata->max_freq);

	min_limit_perf = div_u64(policy->min * cpudata->highest_perf, cpudata->max_freq);



	lowest_perf = READ_ONCE(cpudata->lowest_perf);

	if (min_limit_perf < lowest_perf)

		min_limit_perf = lowest_perf;



	if (max_limit_perf < min_limit_perf)

		max_limit_perf = min_limit_perf;



	WRITE_ONCE(cpudata->max_limit_perf, max_limit_perf);

	WRITE_ONCE(cpudata->min_limit_perf, min_limit_perf);

	WRITE_ONCE(cpudata->max_limit_freq, policy->max);
@@ -1387,6 +1394,12 @@ static void amd_pstate_epp_update_limit(struct cpufreq_policy *policy) 
	max_limit_perf = div_u64(policy->max * cpudata->highest_perf, cpudata->max_freq);

	min_limit_perf = div_u64(policy->min * cpudata->highest_perf, cpudata->max_freq);



	if (min_limit_perf < min_perf)

		min_limit_perf = min_perf;



	if (max_limit_perf < min_limit_perf)

		max_limit_perf = min_limit_perf;



	WRITE_ONCE(cpudata->max_limit_perf, max_limit_perf);

	WRITE_ONCE(cpudata->min_limit_perf, min_limit_perf);