Commit 368520a6 authored by Prakash, Prashanth's avatar Prakash, Prashanth Committed by Rafael J. Wysocki
Browse files

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: default avatarPrashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 4f7d029b

drivers/acpi/cppc_acpi.c

+11 −8
Original line number Diff line number Diff line
@@ -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:

include/acpi/cppc_acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -103,6 +103,7 @@ struct cppc_perf_caps { 
	u32 highest_perf;

	u32 nominal_perf;

	u32 lowest_perf;

	u32 lowest_nonlinear_perf;

};



struct cppc_perf_ctrls {