diff options
| 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 /drivers/cpufreq | |
| parent | 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f (diff) | |
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 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cppc_cpufreq.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index 011f35cb47b9..a61a24e0dcae 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -594,6 +594,12 @@ static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu) goto free_mask; } + ret = cppc_get_perf(cpu, &cpu_data->perf_ctrls); + if (ret) { + pr_debug("Err reading CPU%d perf ctrls: ret:%d\n", cpu, ret); + goto free_mask; + } + return cpu_data; free_mask: |