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cpufreq/amd-pstate: Get Highest Freq for a CPU

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If the highest frequency is known for a CPU, use this instead of
trying to calculate by linear interpolation.

Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20261001142341.2934582-4-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <superm1@kernel.org>
This commit is contained in:
Mario Limonciello 2026-10-01 09:23:41 -05:00 committed by Mario Limonciello
parent f9da951d30
commit b3f9051ae2
1 changed files with 8 additions and 3 deletions
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11
drivers/cpufreq/amd-pstate.c
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@ -778,7 +778,10 @@ static void amd_pstate_update_min_max_limit(struct cpufreq_policy *policy)
struct amd_cpudata *cpudata = policy->driver_data;
union perf_cached perf = READ_ONCE(cpudata->perf);
perf.max_limit_perf = freq_to_perf(perf, cpudata->nominal_freq, policy->max);
if (policy->max >= READ_ONCE(cpudata->max_freq))
perf.max_limit_perf = perf.highest_perf;
else
perf.max_limit_perf = freq_to_perf(perf, cpudata->nominal_freq, policy->max);
WRITE_ONCE(cpudata->max_limit_freq, policy->max);
if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {
@ -1104,8 +1107,10 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
WRITE_ONCE(cpudata->nominal_freq, nominal_freq);
/* max_freq is calculated according to (nominal_freq * highest_perf)/nominal_perf */
max_freq = perf_to_freq(perf, nominal_freq, perf.highest_perf);
/* try to look up from BIOS/quirk first, fall back to (nominal_freq * highest_perf)/nominal_perf */
max_freq = amd_get_max_frequency(cpudata->cpu) * 1000;
if (!max_freq)
max_freq = perf_to_freq(perf, nominal_freq, perf.highest_perf);
WRITE_ONCE(cpudata->max_freq, max_freq);
lowest_nonlinear_freq = perf_to_freq(perf, nominal_freq, perf.lowest_nonlinear_perf);