[PATCH 5/6] cpufreq/acpi-cpufreq: Use amd_get_boost_ratio()

Mario Limonciello (AMD)
2026-04-27T03:55:34Z

Update get_max_boost_ratio() to use the new amd_get_boost_ratio()
helper function instead of calling amd_get_effective_highest_perf()
directly.

This ensures the boost ratio is calculated correctly on systems where
frequency values should be used instead of performance values.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
---
drivers/cpufreq/acpi-cpufreq.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index a1a005b29daba..6e80540311f60 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -626,7 +626,7 @@ static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
static u64 get_max_boost_ratio(unsigned int cpu, u64 *nominal_freq)
{
struct cppc_perf_caps perf_caps;
- u64 highest_perf, nominal_perf;
+ u64 numerator, denominator;
int ret;

if (acpi_pstate_strict)
@@ -640,33 +640,31 @@ static u64 get_max_boost_ratio(unsigned int cpu, u64 *nominal_freq)
}

if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
- ret = amd_get_effective_highest_perf(cpu);
- if (ret < 0) {
- pr_debug("CPU%d: Unable to get boost ratio numerator (%d)\n",
+ ret = amd_get_boost_ratio(cpu, &numerator, &denominator);
+ if (ret) {
+ pr_debug("CPU%d: Unable to get boost ratio (%d)\n",
cpu, ret);
return 0;
}
- highest_perf = ret;
} else {
- highest_perf = perf_caps.highest_perf;
+ numerator = perf_caps.highest_perf;
+ denominator = perf_caps.nominal_perf;
}

- nominal_perf = perf_caps.nominal_perf;
-
if (nominal_freq)
*nominal_freq = perf_caps.nominal_freq * 1000;

- if (!highest_perf || !nominal_perf) {
+ if (!numerator || !denominator) {
pr_debug("CPU%d: highest or nominal performance missing\n", cpu);
return 0;
}

- if (highest_perf < nominal_perf) {
+ if (numerator < denominator) {
pr_debug("CPU%d: nominal performance above highest\n", cpu);
return 0;
}

- return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
+ return div_u64(numerator << SCHED_CAPACITY_SHIFT, denominator);
}

#else
--
2.43.0