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>
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 3ca0729..ee00a1c 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -972,9 +972,9 @@
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 @@
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 @@
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: