Commit 29523f09 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
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ACPI / CPPC: Add support for guaranteed performance 



The Continuous Performance Control package may contain an optional
guaranteed performance field.

Add support to read guaranteed performance from _CPC.

Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 2733fb0d

drivers/acpi/cppc_acpi.c

+6 −2
Original line number Diff line number Diff line
@@ -1061,9 +1061,9 @@ 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,

		*lowest_non_linear_reg, *nominal_reg,

		*lowest_non_linear_reg, *nominal_reg, *guaranteed_reg,

		*low_freq_reg = NULL, *nom_freq_reg = NULL;

	u64 high, low, nom, min_nonlinear, low_f = 0, nom_f = 0;

	u64 high, low, guaranteed, nom, min_nonlinear, low_f = 0, nom_f = 0;

	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);

	struct cppc_pcc_data *pcc_ss_data = NULL;

	int ret = 0, regs_in_pcc = 0;
@@ -1079,6 +1079,7 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) 
	nominal_reg = &cpc_desc->cpc_regs[NOMINAL_PERF];

	low_freq_reg = &cpc_desc->cpc_regs[LOWEST_FREQ];

	nom_freq_reg = &cpc_desc->cpc_regs[NOMINAL_FREQ];

	guaranteed_reg = &cpc_desc->cpc_regs[GUARANTEED_PERF];



	/* Are any of the regs PCC ?*/

	if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) ||
@@ -1107,6 +1108,9 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) 
	cpc_read(cpunum, nominal_reg, &nom);

	perf_caps->nominal_perf = nom;



	cpc_read(cpunum, guaranteed_reg, &guaranteed);

	perf_caps->guaranteed_perf = guaranteed;



	cpc_read(cpunum, lowest_non_linear_reg, &min_nonlinear);

	perf_caps->lowest_nonlinear_perf = min_nonlinear;

include/acpi/cppc_acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ enum cppc_regs { 
 * today.

 */

struct cppc_perf_caps {

	u32 guaranteed_perf;

	u32 highest_perf;

	u32 nominal_perf;

	u32 lowest_perf;

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