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cpufreq: amd-pstate: Allow users to write 'default' EPP string

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[ Upstream commit fc6e0837264a8b2504b6160e63ec92eb012540f3 ]

The EPP string for 'default' represents what the firmware had configured
as the default EPP value but once a user changes EPP to another string
they can't reset it back to 'default'.

Cache the firmware EPP value and allow the user to write 'default' using
this value.

Reported-by: Artem S. Tashkinov <aros@gmx.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217931#c61
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mario Limonciello 2024-06-12 09:20:49 -05:00 committed by Greg Kroah-Hartman
parent 25d53aad91
commit 5da2633513
2 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/cpufreq/amd-pstate.c
View File

@ -304,10 +304,8 @@ static int amd_pstate_set_energy_pref_index(struct amd_cpudata *cpudata,
int epp = -EINVAL;
int ret;
if (!pref_index) {
pr_debug("EPP pref_index is invalid\n");
return -EINVAL;
}
if (!pref_index)
epp = cpudata->epp_default;
if (epp == -EINVAL)
epp = epp_values[pref_index];
@ -1439,7 +1437,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
policy->driver_data = cpudata;
cpudata->epp_cached = amd_pstate_get_epp(cpudata, 0);
cpudata->epp_cached = cpudata->epp_default = amd_pstate_get_epp(cpudata, 0);
policy->min = policy->cpuinfo.min_freq;
policy->max = policy->cpuinfo.max_freq;

1
drivers/cpufreq/amd-pstate.h
View File

@ -99,6 +99,7 @@ struct amd_cpudata {
u32 policy;
u64 cppc_cap1_cached;
bool suspended;
s16 epp_default;
};
#endif /* _LINUX_AMD_PSTATE_H */