intel_idle: Add SKX support

SKX is similar to BDX
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/idle/intel_idle.c

@@ -660,6 +660,35 @@ static struct cpuidle_state skl_cstates[] = {
 		.enter = NULL }
 };
 
+static struct cpuidle_state skx_cstates[] = {
+	{
+		.name = "C1-SKX",
+		.desc = "MWAIT 0x00",
+		.flags = MWAIT2flg(0x00),
+		.exit_latency = 2,
+		.target_residency = 2,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C1E-SKX",
+		.desc = "MWAIT 0x01",
+		.flags = MWAIT2flg(0x01),
+		.exit_latency = 10,
+		.target_residency = 20,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.name = "C6-SKX",
+		.desc = "MWAIT 0x20",
+		.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 133,
+		.target_residency = 600,
+		.enter = &intel_idle,
+		.enter_freeze = intel_idle_freeze, },
+	{
+		.enter = NULL }
+};
+
 static struct cpuidle_state atom_cstates[] = {
 	{
 		.name = "C1E-ATM",
@@ -907,6 +936,10 @@ static const struct idle_cpu idle_cpu_skl = {
 	.disable_promotion_to_c1e = true,
 };
 
+static const struct idle_cpu idle_cpu_skx = {
+	.state_table = skx_cstates,
+	.disable_promotion_to_c1e = true,
+};
 
 static const struct idle_cpu idle_cpu_avn = {
 	.state_table = avn_cstates,
@@ -948,6 +981,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
 	ICPU(0x56, idle_cpu_bdw),
 	ICPU(0x4e, idle_cpu_skl),
 	ICPU(0x5e, idle_cpu_skl),
+	ICPU(0x55, idle_cpu_skx),
 	ICPU(0x57, idle_cpu_knl),
 	{}
 };