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| author | Sumit Gupta <sumitg@nvidia.com> | 2026-02-06 19:56:52 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-02-27 20:50:41 +0100 |
| commit | 658fa7b1c47a857af484c5c5dff8d0164b7c7bfb (patch) | |
| tree | 89c245654680c7636aaa688ad24271e7f91c0493 /include/acpi | |
| parent | 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f (diff) | |
| download | lwn-658fa7b1c47a857af484c5c5dff8d0164b7c7bfb.tar.gz lwn-658fa7b1c47a857af484c5c5dff8d0164b7c7bfb.zip | |
ACPI: CPPC: Add cppc_get_perf() API to read performance controls
Add cppc_get_perf() function to read values of performance control
registers including desired_perf, min_perf, max_perf, energy_perf,
and auto_sel.
This provides a read interface to complement the existing
cppc_set_perf() write interface for performance control registers.
Note that auto_sel is read by cppc_get_perf() but not written by
cppc_set_perf() to avoid unintended mode changes during performance
updates. It can be updated with existing dedicated cppc_set_auto_sel()
API.
Use cppc_get_perf() in cppc_cpufreq_get_cpu_data() to initialize
perf_ctrls with current hardware register values during cpufreq
policy initialization.
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Link: https://patch.msgid.link/20260206142658.72583-2-sumitg@nvidia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/cppc_acpi.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 4d644f03098e..3fc796c0d902 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -151,6 +151,7 @@ extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); +extern int cppc_get_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_set_enable(int cpu, bool enable); extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); @@ -193,6 +194,10 @@ static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ { return -EOPNOTSUPP; } +static inline int cppc_get_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) +{ + return -EOPNOTSUPP; +} static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) { return -EOPNOTSUPP; |