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cpupower: Don't fetch maximum latency when EPP is enabled

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When EPP has been enabled the hardware will autonomously change
frequencies on it's own and thus there is no latency with changing
from the kernel.

Avoid doing the maximum latency check when EPP is found. This will
apply to both amd-pstate and intel-pstate drivers.

Link: https://lore.kernel.org/r/20241218191144.3440854-7-superm1@kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Mario Limonciello 2024-12-18 13:09:55 -06:00 committed by Shuah Khan
parent 5f567afc28
commit acf71265e4
1 changed files with 3 additions and 0 deletions
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3
tools/power/cpupower/utils/cpufreq-info.c
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@ -445,6 +445,9 @@ static int get_latency(unsigned int cpu, unsigned int human)
{
unsigned long latency = cpufreq_get_transition_latency(cpu);
if (!get_epp(cpu, false))
return -EINVAL;
printf(_(" maximum transition latency: "));
if (!latency || latency == UINT_MAX) {
printf(_(" Cannot determine or is not supported.\n"));