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ACPI: CPPC: Add cppc_set_reg_val()

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Add cppc_set_reg_val() as a generic function for setting CPPC register
values, with this features:

 1. Check register. If a register is writeable, it must be a buffer and
    can not be null.

 2. Extract the operations if register is in PCC out as
    cppc_set_reg_val_in_pcc().

This function can be used to reduce some existing code duplication.

Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20250411093855.982491-6-zhenglifeng1@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lifeng Zheng 2025-04-11 17:38:52 +08:00 committed by Rafael J. Wysocki
parent b5ef45e6a1
commit e05c75072c
1 changed files with 49 additions and 0 deletions
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49
drivers/acpi/cppc_acpi.c
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@ -1232,6 +1232,55 @@ static int cppc_get_reg_val(int cpu, enum cppc_regs reg_idx, u64 *val)
return cpc_read(cpu, reg, val);
}
static int cppc_set_reg_val_in_pcc(int cpu, struct cpc_register_resource *reg, u64 val)
{
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cppc_pcc_data *pcc_ss_data = NULL;
int ret;
if (pcc_ss_id < 0) {
pr_debug("Invalid pcc_ss_id\n");
return -ENODEV;
}
ret = cpc_write(cpu, reg, val);
if (ret)
return ret;
pcc_ss_data = pcc_data[pcc_ss_id];
down_write(&pcc_ss_data->pcc_lock);
/* after writing CPC, transfer the ownership of PCC to platform */
ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
up_write(&pcc_ss_data->pcc_lock);
return ret;
}
static int cppc_set_reg_val(int cpu, enum cppc_regs reg_idx, u64 val)
{
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
struct cpc_register_resource *reg;
if (!cpc_desc) {
pr_debug("No CPC descriptor for CPU:%d\n", cpu);
return -ENODEV;
}
reg = &cpc_desc->cpc_regs[reg_idx];
/* if a register is writeable, it must be a buffer and not null */
if ((reg->type != ACPI_TYPE_BUFFER) || IS_NULL_REG(&reg->cpc_entry.reg)) {
pr_debug("CPC register is not supported\n");
return -EOPNOTSUPP;
}
if (CPC_IN_PCC(reg))
return cppc_set_reg_val_in_pcc(cpu, reg, val);
return cpc_write(cpu, reg, val);
}
/**
* cppc_get_desired_perf - Get the desired performance register value.
* @cpunum: CPU from which to get desired performance.