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| author |   Perry Yuan <perry.yuan@amd.com> | 2024-04-25 16:07:58 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-04-26 19:35:38 +0200 |
| commit | eb8b6c36820214df96e7e86d8614d93f6b028f28 (patch) | |
| tree | 3171ee196cbce85357ee3c43526e97a68a7a19e9 /include/linux | |
| parent | cppc_acpi: print error message if CPPC is unsupported (diff) | |
| download | wireguard-linux-eb8b6c36820214df96e7e86d8614d93f6b028f28.tar.xz wireguard-linux-eb8b6c36820214df96e7e86d8614d93f6b028f28.zip | |
cpufreq: amd-pstate: Add quirk for the pstate CPPC capabilities missing
Add quirks table to get CPPC capabilities issue fixed by providing
correct perf or frequency values while driver loading.
If CPPC capabilities are not defined in the ACPI tables or wrongly
defined by platform firmware, it needs to use quick to get those
issues fixed with correct workaround values to make pstate driver
can be loaded even though there are CPPC capabilities errors.
The workaround will match the broken BIOS which lack of CPPC capabilities
nominal_freq and lowest_freq definition in the ACPI table.
$ cat /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq
0
$ cat /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq
0
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/amd-pstate.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index ec0b0fa3e9bb..d58fc022ec46 100644 --- a/include/linux/amd-pstate.h +++ b/include/linux/amd-pstate.h @@ -128,4 +128,10 @@ static const char * const amd_pstate_mode_string[] = { [AMD_PSTATE_GUIDED] = "guided", NULL, }; + +struct quirk_entry { + u32 nominal_freq; + u32 lowest_freq; +}; + #endif /* _LINUX_AMD_PSTATE_H */ |