Merge branch 'bugfix/deepsleep_disable_brownout_s2_v4.2' into 'release/v4.2'

deep_sleep: on S2 disable the brown out detector before deep sleeping (v4.2)

See merge request espressif/esp-idf!12500

components/esp32/include/esp32/brownout.h

@@ -16,6 +16,16 @@
 #ifndef __ESP_BROWNOUT_H
 #define __ESP_BROWNOUT_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void esp_brownout_init(void);
 
-#endif
+void esp_brownout_disable(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

components/esp32s2/include/esp32s2/brownout.h

@@ -1,4 +1,4 @@
-// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -22,6 +22,8 @@ extern "C" {
 
 void esp_brownout_init(void);
 
+void esp_brownout_disable(void);
+
 #ifdef __cplusplus
 }
 #endif

components/esp32s2/sleep_modes.c

@@ -26,6 +26,7 @@
 #include "esp32s2/rom/rtc.h"
 #include "esp32s2/rom/uart.h"
 #include "esp32s2/rom/ets_sys.h"
+#include "esp32s2/brownout.h"
 #include "soc/cpu.h"
 #include "soc/rtc.h"
 #include "soc/spi_periph.h"
@@ -229,6 +230,10 @@ static uint32_t IRAM_ATTR esp_sleep_start(uint32_t pd_flags)
 
 void IRAM_ATTR esp_deep_sleep_start(void)
 {
+    /* Due to hardware limitations, on S2 the brownout detector sometimes trigger during deep sleep
+       to circumvent this we disable the brownout detector before sleeping  */
+    esp_brownout_disable();
+
     // record current RTC time
     s_config.rtc_ticks_at_sleep_start = rtc_time_get();
     esp_sync_counters_rtc_and_frc();

components/esp_common/src/brownout.c

@@ -73,3 +73,18 @@ void esp_brownout_init(void)
 
     brownout_hal_intr_enable(true);
 }
+
+void esp_brownout_disable(void)
+{
+    brownout_hal_config_t cfg = {
+        .enabled = false,
+    };
+
+    brownout_hal_config(&cfg);
+
+#ifndef SOC_BROWNOUT_RESET_SUPPORTED
+    brownout_hal_intr_enable(false);
+
+    rtc_isr_deregister(rtc_brownout_isr_handler, NULL);
+#endif // not SOC_BROWNOUT_RESET_SUPPORTED
+}