Do not try to use peci between VW_HOST_RST_WARN and VW_PLTRST_N

src/board/system76/common/espi.c

@@ -40,6 +40,8 @@
         vw_set(&W, V); \
     }
 
+bool espi_host_reset = false;
+
 void espi_init(void) {
     if (PLLFREQ != 0b0111) {
         // Workarounds to allow changing PLL
@@ -144,6 +146,9 @@ void espi_event(void) {
                     VW_SET_DEBUG(VW_RCIN_N, VWS_HIGH);
 
                     power_cpu_reset();
+
+                    // Host reset complete
+                    espi_host_reset = false;
                 }
                 last_pltrst_n = wire;
             }
@@ -154,6 +159,11 @@ void espi_event(void) {
             // Set HOST_RST_ACK to HOST_RST_WARN
             wire = vw_get(&VW_HOST_RST_WARN);
             if (wire != vw_get(&VW_HOST_RST_ACK)) {
+                if (wire == VWS_HIGH) {
+                    // Host reset started
+                    espi_host_reset = true;
+                }
+
                 VW_SET_DEBUG(VW_HOST_RST_ACK, wire);
             }
         }

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

@@ -3,8 +3,12 @@
 #ifndef _BOARD_ESPI_H
 #define _BOARD_ESPI_H
 
+#include <stdbool.h>
+
 #include <ec/espi.h>
 
+extern bool espi_host_reset;
+
 void espi_init(void);
 void espi_reset(void);
 void espi_event(void);

src/board/system76/common/peci.c

@@ -1,13 +1,13 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include <arch/time.h>
+#include <board/espi.h>
 #include <board/fan.h>
 #include <board/gpio.h>
 #include <board/peci.h>
 #include <board/power.h>
 #include <common/debug.h>
 #include <common/macro.h>
-#include <ec/espi.h>
 #include <ec/gpio.h>
 #include <ec/pwm.h>
 
@@ -76,6 +76,10 @@ bool peci_available(void) {
     if (power_state != POWER_STATE_S0)
         return false;
 
+    // Currently waiting for host reset, PECI is not available
+    if (espi_host_reset)
+        return false;
+
     // If VW_PLTRST_N virtual wire is not VWS_HIGH, PECI is not available
     // This is because the CPU has not yet exited reset
     if (vw_get(&VW_PLTRST_N) != VWS_HIGH)