Add power_init function

src/board/system76/common/include/board/power.h

@@ -12,6 +12,7 @@ enum PowerState {
 
 extern enum PowerState power_state;
 
+void power_init(void);
 void power_on(void);
 void power_off(void);
 void power_set_limit(void);

src/board/system76/common/main.c

@@ -81,6 +81,7 @@ void init(void) {
     //TODO: INTC
 
     // Must happen last
+    power_init();
     board_init();
 }
 

src/board/system76/common/power.c

@@ -159,6 +159,18 @@ void update_power_state(void) {
     }
 }
 
+void power_init(void) {
+    // See Figure 12-19 in Whiskey Lake Platform Design Guide
+    // | VCCRTC | RTCRST# | VccPRIM |
+    // | tPCH01---------- |         |
+    // | tPCH04-------------------- |
+
+    // tPCH04 is the ideal delay
+    tPCH04;
+
+    update_power_state();
+}
+
 void power_on(void) {
     DEBUG("%02X: power_on\n", main_cycle);