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Power management fix for 6.3-rc7

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Make the amd-pstate cpufreq driver take all of the possible combinations
 of the "old" and "new" status values correctly while changing the
 operation mode via sysfs (Wyes Karny).
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Merge tag 'pm-6.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Make the amd-pstate cpufreq driver take all of the possible
  combinations of the 'old' and 'new' status values correctly while
  changing the operation mode via sysfs (Wyes Karny)"

* tag 'pm-6.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  amd-pstate: Fix amd_pstate mode switch
This commit is contained in:
Linus Torvalds 2023-04-14 10:25:30 -07:00
commit 4b992ead33
1 changed files with 8 additions and 10 deletions
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18
drivers/cpufreq/amd-pstate.c
View file

@ -840,22 +840,20 @@ static int amd_pstate_update_status(const char *buf, size_t size)
switch(mode_idx) {
case AMD_PSTATE_DISABLE:
if (!current_pstate_driver)
return -EINVAL;
if (cppc_state == AMD_PSTATE_ACTIVE)
return -EBUSY;
cpufreq_unregister_driver(current_pstate_driver);
amd_pstate_driver_cleanup();
if (current_pstate_driver) {
cpufreq_unregister_driver(current_pstate_driver);
amd_pstate_driver_cleanup();
}
break;
case AMD_PSTATE_PASSIVE:
if (current_pstate_driver) {
if (current_pstate_driver == &amd_pstate_driver)
return 0;
cpufreq_unregister_driver(current_pstate_driver);
cppc_state = AMD_PSTATE_PASSIVE;
current_pstate_driver = &amd_pstate_driver;
}
current_pstate_driver = &amd_pstate_driver;
cppc_state = AMD_PSTATE_PASSIVE;
ret = cpufreq_register_driver(current_pstate_driver);
break;
case AMD_PSTATE_ACTIVE:
@ -863,10 +861,10 @@ static int amd_pstate_update_status(const char *buf, size_t size)
if (current_pstate_driver == &amd_pstate_epp_driver)
return 0;
cpufreq_unregister_driver(current_pstate_driver);
current_pstate_driver = &amd_pstate_epp_driver;
cppc_state = AMD_PSTATE_ACTIVE;
}
current_pstate_driver = &amd_pstate_epp_driver;
cppc_state = AMD_PSTATE_ACTIVE;
ret = cpufreq_register_driver(current_pstate_driver);
break;
default: