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| author | Prakash, Prashanth <pprakash@codeaurora.org> | 2017-03-29 13:49:59 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-04-18 23:37:49 +0200 |
| commit | 368520a6b2dd232ea5743a6acd9f056bc30e05b4 (patch) | |
| tree | d756fc6eb194f7832f9f04cf1865aa49a89856bb /drivers/acpi/cppc_acpi.c | |
| parent | 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (diff) | |
| download | linux-368520a6b2dd232ea5743a6acd9f056bc30e05b4.tar.bz2 | |
ACPI / CPPC: Read lowest nonlinear perf in cppc_get_perf_caps()
Read lowest non linear perf in cppc_get_perf_caps so that it can be exposed
via sysfs to the usespace. Lowest non linear perf is the lowest performance
level at which nonlinear power savings are achieved.
Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
| -rw-r--r-- | drivers/acpi/cppc_acpi.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 3ca0729f7e0e..ee00a1c94ff6 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -972,9 +972,9 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) { struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); - struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, - *nom_perf; - u64 high, low, nom; + struct cpc_register_resource *highest_reg, *lowest_reg, + *lowest_non_linear_reg, *nominal_reg; + u64 high, low, nom, min_nonlinear; int ret = 0, regs_in_pcc = 0; if (!cpc_desc) { @@ -984,12 +984,12 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF]; lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF]; - ref_perf = &cpc_desc->cpc_regs[REFERENCE_PERF]; - nom_perf = &cpc_desc->cpc_regs[NOMINAL_PERF]; + lowest_non_linear_reg = &cpc_desc->cpc_regs[LOW_NON_LINEAR_PERF]; + nominal_reg = &cpc_desc->cpc_regs[NOMINAL_PERF]; /* Are any of the regs PCC ?*/ if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || - CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { + CPC_IN_PCC(lowest_non_linear_reg) || CPC_IN_PCC(nominal_reg)) { regs_in_pcc = 1; down_write(&pcc_data.pcc_lock); /* Ring doorbell once to update PCC subspace */ @@ -1005,10 +1005,13 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) cpc_read(cpunum, lowest_reg, &low); perf_caps->lowest_perf = low; - cpc_read(cpunum, nom_perf, &nom); + cpc_read(cpunum, nominal_reg, &nom); perf_caps->nominal_perf = nom; - if (!high || !low || !nom) + cpc_read(cpunum, lowest_non_linear_reg, &min_nonlinear); + perf_caps->lowest_nonlinear_perf = min_nonlinear; + + if (!high || !low || !nom || !min_nonlinear) ret = -EFAULT; out_err: |