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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-24 21:18:05 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-24 21:18:05 +0100 |
commit | 17162a117cd0733ad1db728fa804e62ded9a87d6 (patch) | |
tree | 24339c44f10e0d524baabb4bd7535f9dd42ec872 /drivers/acpi | |
parent | 8cbd468bdeb5ed3acac2d7a9f7494d5b77e46297 (diff) | |
parent | 1222d527f314c86a3b59a522115d62facc5a7965 (diff) | |
download | linux-stable-17162a117cd0733ad1db728fa804e62ded9a87d6.tar.gz linux-stable-17162a117cd0733ad1db728fa804e62ded9a87d6.tar.bz2 linux-stable-17162a117cd0733ad1db728fa804e62ded9a87d6.zip |
Merge back earlier cpufreq material for v5.1.
Diffstat (limited to 'drivers/acpi')
-rw-r--r-- | drivers/acpi/cppc_acpi.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 217a782c3e55..1b207fca1420 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1051,6 +1051,48 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) } /** + * cppc_get_desired_perf - Get the value of desired performance register. + * @cpunum: CPU from which to get desired performance. + * @desired_perf: address of a variable to store the returned desired performance + * + * Return: 0 for success, -EIO otherwise. + */ +int cppc_get_desired_perf(int cpunum, u64 *desired_perf) +{ + struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); + struct cpc_register_resource *desired_reg; + struct cppc_pcc_data *pcc_ss_data = NULL; + + desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF]; + + if (CPC_IN_PCC(desired_reg)) { + int ret = 0; + + if (pcc_ss_id < 0) + return -EIO; + + pcc_ss_data = pcc_data[pcc_ss_id]; + + down_write(&pcc_ss_data->pcc_lock); + + if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0) + cpc_read(cpunum, desired_reg, desired_perf); + else + ret = -EIO; + + up_write(&pcc_ss_data->pcc_lock); + + return ret; + } + + cpc_read(cpunum, desired_reg, desired_perf); + + return 0; +} +EXPORT_SYMBOL_GPL(cppc_get_desired_perf); + +/** * cppc_get_perf_caps - Get a CPUs performance capabilities. * @cpunum: CPU from which to get capabilities info. * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h |