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amd-pstate fixes for 7.2 (7/22/26)

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* Fix a case blocking amd-pstate from binding
   when lowest nonlinear freq == minimum freq
 * Stop trying to bind in guests
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Merge tag 'amd-pstate-v7.2-2026-07-22' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux

Merge amd-pstate fixes for 7.2 (7/22/26) from Mario Limonciello:

"* Fix a case blocking amd-pstate from binding
   when lowest nonlinear freq == minimum freq
 * Stop trying to bind in guests"

* tag 'amd-pstate-v7.2-2026-07-22' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux:
  cpufreq/amd-pstate: Prevent the driver from loading on unsupported hardware
  cpufreq/amd-pstate: Loosen requirement on lowest nonlinear frequency != min freq
This commit is contained in:
Rafael J. Wysocki 2026-07-23 13:22:58 +02:00
commit 601eecdeee
1 changed files with 7 additions and 1 deletions
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8
drivers/cpufreq/amd-pstate.c
View File

@ -1031,7 +1031,7 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
return -EINVAL;
}
if (lowest_nonlinear_freq <= min_freq || lowest_nonlinear_freq > nominal_freq) {
if (lowest_nonlinear_freq < min_freq || lowest_nonlinear_freq > nominal_freq) {
pr_err("lowest_nonlinear_freq(%d) value is out of range [min_freq(%d), nominal_freq(%d)]\n",
lowest_nonlinear_freq, min_freq, nominal_freq);
return -EINVAL;
@ -2167,6 +2167,7 @@ static struct cpufreq_driver amd_pstate_epp_driver = {
};
/*
* Processors without frequency scaling support can't do CPPC.
* CPPC function is not supported for family ID 17H with model_ID ranging from 0x10 to 0x2F.
* show the debug message that helps to check if the CPU has CPPC support for loading issue.
*/
@ -2175,6 +2176,11 @@ static bool amd_cppc_supported(void)
struct cpuinfo_x86 *c = &cpu_data(0);
bool warn = false;
if (!cpu_feature_enabled(X86_FEATURE_HW_PSTATE)) {
pr_debug_once("frequency scaling is not supported by the processor\n");
return false;
}
if ((boot_cpu_data.x86 == 0x17) && (boot_cpu_data.x86_model < 0x30)) {
pr_debug_once("CPPC feature is not supported by the processor\n");
return false;