Messages in this thread Patch in this message | | | From | Huang Rui <> | Subject | [PATCH 03/19] ACPI: CPPC: add cppc enable register function | Date | Wed, 8 Sep 2021 22:59:45 +0800 |
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From: Jinzhou Su <Jinzhou.Su@amd.com>
Export the cppc enable register function for future use.
Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> --- drivers/acpi/cppc_acpi.c | 42 ++++++++++++++++++++++++++++++++++++++++ include/acpi/cppc_acpi.h | 5 +++++ 2 files changed, 47 insertions(+)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index a4d4eebba1da..de4b30545215 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1220,6 +1220,48 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) } EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs); +/** + * cppc_set_enable - Set to enable CPPC register. + * @cpu: CPU for which to enable CPPC register. + * @enable: enable field to write into share memory. + * + * Return: 0 for success, -ERRNO otherwise. + */ +int cppc_set_enable(int cpu, u32 enable) +{ + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); + struct cpc_register_resource *enable_reg; + struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu); + struct cppc_pcc_data *pcc_ss_data = NULL; + int ret = -1; + + if (!cpc_desc) { + pr_debug("No CPC descriptor for CPU:%d\n", cpu); + return -ENODEV; + } + + enable_reg = &cpc_desc->cpc_regs[ENABLE]; + + if (CPC_IN_PCC(enable_reg)) { + + if (pcc_ss_id < 0) + return -EIO; + + ret = cpc_write(cpu, enable_reg, enable); + if (ret) + return ret; + + pcc_ss_data = pcc_data[pcc_ss_id]; + + down_write(&pcc_ss_data->pcc_lock); + send_pcc_cmd(pcc_ss_id, CMD_WRITE); + up_write(&pcc_ss_data->pcc_lock); + } + + return ret; +} +EXPORT_SYMBOL_GPL(cppc_set_enable); + /** * cppc_set_perf - Set a CPU's performance controls. * @cpu: CPU for which to set performance controls. diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 9f4985b4d64d..3fdae40a75fc 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -137,6 +137,7 @@ struct cppc_cpudata { extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); +extern int cppc_set_enable(int cpu, u32 enable); extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); extern bool acpi_cpc_valid(void); extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data); @@ -157,6 +158,10 @@ static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) { return -ENOTSUPP; } +static inline int cppc_set_enable(int cpu, u32 enable) +{ + return -ENOTSUPP; +} static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps) { return -ENOTSUPP; -- 2.25.1
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