6.15-stable review patch. If anyone has any objections, please let me know.
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From: Gautham R. Shenoy gautham.shenoy@amd.com
commit cb6a85f38f456b086c366e346ebb67ffa70c7243 upstream.
commit 083466754596 ("cpufreq: ACPI: Fix max-frequency computation") modified get_max_boost_ratio() to return the nominal_freq advertised in the _CPC object. This was for the purposes of computing the maximum frequency. The frequencies advertised in _CPC objects are in MHz. However, cpufreq expects the frequency to be in KHz. Since the nominal_freq returned by get_max_boost_ratio() was not in KHz but instead in MHz,the cpuinfo_max_frequency that was computed using this nominal_freq was incorrect and an invalid value which resulted in cpufreq reporting the P0 frequency as the cpuinfo_max_freq.
Fix this by converting the nominal_freq to KHz before returning the same from get_max_boost_ratio().
Reported-by: Manu Bretelle chantr4@gmail.com Closes: https://lore.kernel.org/lkml/aDaB63tDvbdcV0cg@HQ-GR2X1W2P57/ Fixes: 083466754596 ("cpufreq: ACPI: Fix max-frequency computation") Signed-off-by: Gautham R. Shenoy gautham.shenoy@amd.com Cc: 6.14+ stable@vger.kernel.org # 6.14+ Link: https://patch.msgid.link/20250529085143.709-1-gautham.shenoy@amd.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpufreq/acpi-cpufreq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -660,7 +660,7 @@ static u64 get_max_boost_ratio(unsigned nominal_perf = perf_caps.nominal_perf;
if (nominal_freq) - *nominal_freq = perf_caps.nominal_freq; + *nominal_freq = perf_caps.nominal_freq * 1000;
if (!highest_perf || !nominal_perf) { pr_debug("CPU%d: highest or nominal performance missing\n", cpu);