From 46f38d05d6c5d6dc3314723f8aef363707197bd5 Mon Sep 17 00:00:00 2001
From: Subrata Banik <subratabanik@google.com>
Date: Sun, 9 Feb 2025 07:53:42 +0000
Subject: [PATCH] ec/google/chromeec: Implement early power off

This commit implements the `google_chromeec_do_early_poweroff`
function for the Chrome EC. This allows the system to power
off before memory initialization by triggering an EC reset
with EC_REBOOT_COLD_AP_OFF.

BUG=b:339673254
TEST=Able to build and boot google/brox.

Change-Id: Ia53469feb2a020b38a5414728159b09c86c7e32d
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86337
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
---
 src/ec/google/chromeec/ec.c | 7 +++++++
 src/ec/google/chromeec/ec.h | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index 2e8961f5f2..cc581ffb7b 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -8,6 +8,7 @@
 #include <device/device.h>
 #include <device/path.h>
 #include <elog.h>
+#include <halt.h>
 #include <rtc.h>
 #include <security/vboot/vboot_common.h>
 #include <stdlib.h>
@@ -1669,3 +1670,9 @@ bool google_chromeec_is_battery_present(void)
 
 	return false;
 }
+
+void google_chromeec_do_early_poweroff(void)
+{
+	google_chromeec_reboot(EC_REBOOT_COLD_AP_OFF, 0);
+	halt();
+}
diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h
index b11b7a834a..08d4f2771d 100644
--- a/src/ec/google/chromeec/ec.h
+++ b/src/ec/google/chromeec/ec.h
@@ -471,6 +471,14 @@ bool google_chromeec_is_below_critical_threshold(void);
  */
 bool google_chromeec_is_battery_present(void);
 
+/*
+ * Performs early power off.
+ *
+ * This function handles the necessary steps to initiate an early power off
+ * sequence.
+ */
+void google_chromeec_do_early_poweroff(void);
+
 /**
  * Determine if the UCSI stack is currently active.
  *