From e96d653c9ecff6d90113bcead8ef003050d87562 Mon Sep 17 00:00:00 2001
From: Ivan Grokhotkov <ivan@espressif.com>
Date: Wed, 22 Feb 2017 17:04:11 +0800
Subject: [PATCH] ulp: make sure I_WAKE instruction works with ULP timer
 disabled

Setting ULP_CP_WAKEUP_FORCE_EN forces ULP wakeup to work even if the
ULP timer has already been disabled.
---
 components/esp32/deep_sleep.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/components/esp32/deep_sleep.c b/components/esp32/deep_sleep.c
index aadb6067ec..55e92a05e0 100644
--- a/components/esp32/deep_sleep.c
+++ b/components/esp32/deep_sleep.c
@@ -126,6 +126,9 @@ void IRAM_ATTR esp_deep_sleep_start()
     if (s_config.wakeup_triggers & EXT_EVENT1_TRIG_EN) {
         ext1_wakeup_prepare();
     }
+    if (s_config.wakeup_triggers & SAR_TRIG_EN) {
+        SET_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_ULP_CP_WAKEUP_FORCE_EN);
+    }
     // TODO: move timer wakeup configuration into a similar function
     // once rtc_sleep is opensourced.