Re: [PATCH 1/3] ACPI: CPPC: Refactor boost ratio handling

[Mario Limonciello <mario.limonciello@amd.com>]

On 9/1/26 04:31, K Prateek Nayak wrote:
> On 9/1/2026 1:14 AM, Mario Limonciello wrote:
>> +int amd_get_max_frequency(unsigned int cpu)
>> +{
>> +	enum x86_topology_cpu_type type = cpu_data(cpu).topo.cpu_type;
>> +	const struct x86_cpu_id *id = x86_match_cpu(amd_zen6_client_ids);
>> +	const struct amd_max_freq *max_freq;
>> +
>> +	if (!id)
>> +		return -ENODEV;
>> +
>> +	max_freq = (const struct amd_max_freq *)id->driver_data;
>> +
>> +	switch (type) {
>> +	case TOPO_CPU_TYPE_PERFORMANCE:
>> +		return max_freq->performance;
>> +	case TOPO_CPU_TYPE_EFFICIENCY:
>> +		return max_freq->efficiency;
>> +	case TOPO_CPU_TYPE_LOW_POWER:
>> +		return max_freq->low_power;
>> +	default:
>> +		break;
>> +	}
>> +
>> +	return -EINVAL;
> 
> nit. Since we don't really propagate the error codes returned
> by amd_get_max_frequency(), maybe we can return 0 instead of
> -ENODEV, -EINVAL and the callers can simply do:
> 
>      max_freq = amd_get_max_frequency(cpu);
>      if (!max_freq)
>           max_freq = /* Fallback */;
> 
> similar to get_max_boost_ratio() pattern. No strong feelings
> either way.
> 

OK.  Will adjust for next version.

>> +}
>> +EXPORT_SYMBOL_GPL(amd_get_max_frequency);