idle_intel: Add Denverton

Denverton is an Intel Atom based micro server which shares the same
Goldmont architecture as Broxton. The available C-states on
Denverton is a subset of Broxton with only C1, C1e, and C6.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 4c8b23d1a928..170ab8e01075 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -826,6 +826,35 @@ static struct cpuidle_state bxt_cstates[] = {
                 .enter = NULL }
 };
 
+static struct cpuidle_state dnv_cstates[] = {
+        {
+                .name = "C1-DNV",
+                .desc = "MWAIT 0x00",
+                .flags = MWAIT2flg(0x00),
+                .exit_latency = 2,
+                .target_residency = 2,
+                .enter = &intel_idle,
+                .enter_freeze = intel_idle_freeze, },
+        {
+                .name = "C1E-DNV",
+                .desc = "MWAIT 0x01",
+                .flags = MWAIT2flg(0x01),
+                .exit_latency = 10,
+                .target_residency = 20,
+                .enter = &intel_idle,
+                .enter_freeze = intel_idle_freeze, },
+        {
+                .name = "C6-DNV",
+                .desc = "MWAIT 0x20",
+                .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+                .exit_latency = 50,
+                .target_residency = 500,
+                .enter = &intel_idle,
+                .enter_freeze = intel_idle_freeze, },
+        {
+                .enter = NULL }
+};
+
 /**
  * intel_idle
  * @dev: cpuidle_device
@@ -1015,6 +1044,11 @@ static const struct idle_cpu idle_cpu_bxt = {
         .disable_promotion_to_c1e = true,
 };
 
+static const struct idle_cpu idle_cpu_dnv = {
+        .state_table = dnv_cstates,
+        .disable_promotion_to_c1e = true,
+};
+
 #define ICPU(model, cpu) \
         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT, (unsigned long)&cpu }
 
@@ -1051,6 +1085,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
         ICPU(INTEL_FAM6_SKYLAKE_X,              idle_cpu_skx),
         ICPU(INTEL_FAM6_XEON_PHI_KNL,           idle_cpu_knl),
         ICPU(INTEL_FAM6_ATOM_GOLDMONT,          idle_cpu_bxt),
+        ICPU(INTEL_FAM6_ATOM_DENVERTON,         idle_cpu_dnv),
         {}
 };