[logger] Flush uart before sleep in idf 6 (#18975)

esphome/components/logger/logger_esp32.cpp

@@ -3,6 +3,7 @@
 
 #include "esphome/components/esp32/crash_handler.h"
 #include <esp_log.h>
+#include <esp_idf_version.h>
 
 #include <driver/uart.h>
 #include <soc/soc_caps.h>
@@ -16,8 +17,10 @@
 #include <driver/usb_serial_jtag_vfs.h>
 #endif
 #endif
-
-#include "esp_idf_version.h"
+#if defined(CONFIG_PM_ENABLE) && defined(CONFIG_FREERTOS_USE_TICKLESS_IDLE) && \
+    (ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0))
+#include "esp_sleep.h"
+#endif
 #include "freertos/FreeRTOS.h"
 
 #include <fcntl.h>
@@ -87,6 +90,12 @@ void init_uart(uart_port_t uart_num, uint32_t baud_rate, int tx_buffer_size) {
   // ESP-IDF requires rx_buffer_size > UART_HW_FIFO_LEN (128 bytes).
   const int min_rx_buffer_size = UART_HW_FIFO_LEN(uart_num) + 1;
   uart_driver_install(uart_num, min_rx_buffer_size, tx_buffer_size, 0, nullptr, 0);
+#if defined(CONFIG_PM_ENABLE) && defined(CONFIG_FREERTOS_USE_TICKLESS_IDLE) && \
+    (ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0))
+  // Always flush before going to light sleep. Could be disabled for devices
+  // without TOP_PD or if source_clk = UART_SCLK_RTC
+  esp_sleep_set_console_uart_handling_mode(ESP_SLEEP_ALWAYS_FLUSH_UART);
+#endif
 }
 
 void Logger::pre_setup() {

sdkconfig.defaults

@@ -17,6 +17,8 @@ CONFIG_ESP_TASK_WDT_INIT=y
 CONFIG_ESP_TASK_WDT_PANIC=y
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU0=n
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU1=n
+CONFIG_FREERTOS_USE_TICKLESS_IDLE=y
+CONFIG_PM_ENABLE=y
 
 # esp32_ble
 CONFIG_BT_ENABLED=y