cpufreq: intel_pstate: Broxton support

Add Broxton CPU model number.

Broxton requires core_params to get performance limits via MSRs, but
it is an Atom platform, which requires more power optimized algorithm.

So the P state selection will use similar algorithm as other Atom
platforms.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index e1b7a5e288f9..8a0e40591f1f 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1110,6 +1110,26 @@ static struct cpu_defaults knl_params = {
         },
 };
 
+static struct cpu_defaults bxt_params = {
+        .pid_policy = {
+                .sample_rate_ms = 10,
+                .deadband = 0,
+                .setpoint = 60,
+                .p_gain_pct = 14,
+                .d_gain_pct = 0,
+                .i_gain_pct = 4,
+        },
+        .funcs = {
+                .get_max = core_get_max_pstate,
+                .get_max_physical = core_get_max_pstate_physical,
+                .get_min = core_get_min_pstate,
+                .get_turbo = core_get_turbo_pstate,
+                .get_scaling = core_get_scaling,
+                .get_val = core_get_val,
+                .get_target_pstate = get_target_pstate_use_cpu_load,
+        },
+};
+
 static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
 {
         int max_perf = cpu->pstate.turbo_pstate;
@@ -1370,6 +1390,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
         ICPU(INTEL_FAM6_SKYLAKE_DESKTOP,        core_params),
         ICPU(INTEL_FAM6_BROADWELL_XEON_D,       core_params),
         ICPU(INTEL_FAM6_XEON_PHI_KNL,           knl_params),
+        ICPU(INTEL_FAM6_ATOM_GOLDMONT,          bxt_params),
         {}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);