auron: Change thermal behavior to match other haswell platforms

Auron port of Samus commit 8e51d1d74c.

BUG=chrome-os-partner:31286
TEST=Compile only.
BRANCH=None.

Change-Id: I8b50edf37062205193acecf984c1b4ee33b3222a
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/213953
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/mainboard/google/auron/acpi/thermal.asl

@@ -21,6 +21,20 @@
 
 Scope (\_TZ)
 {
+	// Handler for throttle requests on this platform
+	//  0 = Stop throttling
+	//  1 = Start throttling
+	Method (THRT, 1, Serialized)
+	{
+		If (LEqual (Arg0, 0)) {
+			/* Disable Power Limit */
+			\_SB.PCI0.MCHC.CTLD ()
+		} Else {
+			/* Enable Power Limit */
+			\_SB.PCI0.MCHC.CTLE (\F0PW)
+		}
+	}
+
 	ThermalZone (THRM)
 	{
 		Name (_TC1, 0x02)
@@ -61,7 +75,7 @@ Scope (\_TZ)
 			Return (\PPKG ())
 		}
 
-		Method (_TMP, 0, Serialized)
+		Method (TCHK, 0, Serialized)
 		{
 			// Get Temperature from TIN# set in NVS
 			Store (\_SB.PCI0.LPCB.EC0.TINS (TMPS), Local0)
@@ -94,85 +108,29 @@ Scope (\_TZ)
 			Return (Local0)
 		}
 
-		/* CTDP Down */
-		Method (_AC0) {
-			If (LLessEqual (\FLVL, 0)) {
-				Return (CTOK (\F0OF))
-			} Else {
-				Return (CTOK (\F0ON))
-			}
-		}
-
-		/* CTDP Nominal */
-		Method (_AC1) {
-			If (LLessEqual (\FLVL, 1)) {
-				Return (CTOK (\F1OF))
-			} Else {
-				Return (CTOK (\F1ON))
-			}
-		}
-
-		Name (_AL0, Package () { TDP0 })
-		Name (_AL1, Package () { TDP1 })
-
-		PowerResource (TNP0, 0, 0)
+		Method (_TMP, 0, Serialized)
 		{
-			Method (_STA) {
-				If (LLessEqual (\FLVL, 0)) {
-					Return (One)
-				} Else {
-					Return (Zero)
-				}
+			// Get temperature from EC in deci-kelvin
+			Store (TCHK (), Local0)
+
+			// Critical temperature in deci-kelvin
+			Store (CTOK (\TCRT), Local1)
+
+			If (LGreaterEqual (Local0, Local1)) {
+				Store ("CRITICAL TEMPERATURE", Debug)
+				Store (Local0, Debug)
+
+				// Wait 1 second for EC to re-poll
+				Sleep (1000)
+
+				// Re-read temperature from EC
+				Store (TCHK (), Local0)
+
+				Store ("RE-READ TEMPERATURE", Debug)
+				Store (Local0, Debug)
 			}
-			Method (_ON)  {
-				Store (0, \FLVL)
 
-				/* Enable Power Limit */
-				\_SB.PCI0.MCHC.CTLE (\F0PW)
-
-				Notify (\_TZ.THRM, 0x81)
-			}
-			Method (_OFF) {
-				Store (1, \FLVL)
-
-				/* Disable Power Limit */
-				\_SB.PCI0.MCHC.CTLD ()
-
-				Notify (\_TZ.THRM, 0x81)
-			}
-		}
-
-		PowerResource (TNP1, 0, 0)
-		{
-			Method (_STA) {
-				If (LLessEqual (\FLVL, 1)) {
-					Return (One)
-				} Else {
-					Return (Zero)
-				}
-			}
-			Method (_ON)  {
-				Store (1, \FLVL)
-				Notify (\_TZ.THRM, 0x81)
-			}
-			Method (_OFF) {
-				Store (1, \FLVL)
-				Notify (\_TZ.THRM, 0x81)
-			}
-		}
-
-		Device (TDP0)
-		{
-			Name (_HID, EISAID ("PNP0C0B"))
-			Name (_UID, 0)
-			Name (_PR0, Package () { TNP0 })
-		}
-
-		Device (TDP1)
-		{
-			Name (_HID, EISAID ("PNP0C0B"))
-			Name (_UID, 1)
-			Name (_PR0, Package () { TNP1 })
+			Return (Local0)
 		}
 	}
 }

src/mainboard/google/auron/acpi_tables.c

@@ -41,20 +41,12 @@ extern const unsigned char AmlCode[];
 
 static void acpi_update_thermal_table(global_nvs_t *gnvs)
 {
-	gnvs->tmps = CTL_TDP_SENSOR_ID;
-
-	/* Normal TDP */
-	gnvs->f1of = 0;
-	gnvs->f1on = 0;
-
-	/* Limited TDP */
-	gnvs->f0of = CTL_TDP_THRESHOLD_OFF;
-	gnvs->f0on = CTL_TDP_THRESHOLD_ON;
-	gnvs->f0pw = CTL_TDP_POWER_LIMIT;
+	gnvs->tmps = TEMPERATURE_SENSOR_ID;
 
 	gnvs->tcrt = CRITICAL_TEMPERATURE;
 	gnvs->tpsv = PASSIVE_TEMPERATURE;
 	gnvs->tmax = MAX_TEMPERATURE;
+	gnvs->f0pw = EC_THROTTLE_POWER_LIMIT;
 	gnvs->flvl = 1;
 }
 

src/mainboard/google/auron/ec.h

@@ -35,6 +35,8 @@
 	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_BATTERY)           |\
 	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_THERMAL_THRESHOLD) |\
 	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_THERMAL_OVERLOAD)  |\
+	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_START)    |\
+	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_STOP)     |\
 	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_CHARGER))
 
 #define MAINBOARD_EC_SMI_EVENTS \

src/mainboard/google/auron/thermal.h

@@ -20,11 +20,10 @@
 #ifndef THERMAL_H
 #define THERMAL_H
 
-/* Control TDP Settings */
-#define CTL_TDP_SENSOR_ID		0	/* PECI */
-#define CTL_TDP_POWER_LIMIT		12	/* 12W */
-#define CTL_TDP_THRESHOLD_OFF		80	/* Normal at 80C */
-#define CTL_TDP_THRESHOLD_ON		85	/* Limited at 85C */
+#define TEMPERATURE_SENSOR_ID		0	/* PECI */
+
+/* Power level to set when EC requests throttle */
+#define EC_THROTTLE_POWER_LIMIT		12	/* 12W */
 
 /* Temperature which OS will shutdown at */
 #define CRITICAL_TEMPERATURE		99