Allow phy to be initialized only if WiFi/BLE is used/enabled

fixes: https://github.com/espressif/arduino-esp32/issues/72

cores/esp32/esp32-hal-misc.c

@@ -18,6 +18,51 @@
 #include "freertos/task.h"
 #include "esp_attr.h"
 
+#if !CONFIG_ESP32_PHY_AUTO_INIT
+#include "nvs_flash.h"
+#include "esp_phy_init.h"
+#include "rom/rtc.h"
+void arduino_phy_init()
+{
+    static bool initialized = false;
+    if(initialized){
+        return;
+    }
+    nvs_flash_init();
+    esp_phy_calibration_mode_t calibration_mode = PHY_RF_CAL_PARTIAL;
+    if (rtc_get_reset_reason(0) == DEEPSLEEP_RESET) {
+        calibration_mode = PHY_RF_CAL_NONE;
+    }
+    const esp_phy_init_data_t* init_data = esp_phy_get_init_data();
+    if (init_data == NULL) {
+        printf("failed to obtain PHY init data\n");
+        abort();
+    }
+    esp_phy_calibration_data_t* cal_data =
+            (esp_phy_calibration_data_t*) calloc(sizeof(esp_phy_calibration_data_t), 1);
+    if (cal_data == NULL) {
+        printf("failed to allocate memory for RF calibration data\n");
+        abort();
+    }
+    esp_err_t err = esp_phy_load_cal_data_from_nvs(cal_data);
+    if (err != ESP_OK) {
+        printf("failed to load RF calibration data, falling back to full calibration\n");
+        calibration_mode = PHY_RF_CAL_FULL;
+    }
+
+    esp_phy_init(init_data, calibration_mode, cal_data);
+
+    if (calibration_mode != PHY_RF_CAL_NONE) {
+        err = esp_phy_store_cal_data_to_nvs(cal_data);
+    } else {
+        err = ESP_OK;
+    }
+    esp_phy_release_init_data(init_data);
+    free(cal_data); // PHY maintains a copy of calibration data, so we can free this
+    initialized = true;
+}
+#endif
+
 uint32_t IRAM_ATTR micros()
 {
     uint32_t ccount;

cores/esp32/esp32-hal.h

@@ -65,6 +65,10 @@ uint32_t millis();
 void delay(uint32_t);
 void delayMicroseconds(uint32_t us);
 
+#if !CONFIG_ESP32_PHY_AUTO_INIT
+void arduino_phy_init();
+#endif
+
 #if !CONFIG_AUTOSTART_ARDUINO
 void initArduino();
 #endif

libraries/WiFi/src/WiFiGeneric.cpp

@@ -52,6 +52,9 @@ extern "C" {
 static bool _esp_wifi_initalized = false;
 extern void initWiFi()
 {
+#if !CONFIG_ESP32_PHY_AUTO_INIT
+    arduino_phy_init();
+#endif
     wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
     tcpip_adapter_init();
     esp_event_loop_init(&WiFiGenericClass::_eventCallback, NULL);

tools/sdk/include/config/sdkconfig.h

@@ -58,7 +58,7 @@
 #define CONFIG_PARTITION_TABLE_CUSTOM_FILENAME "partitions.csv"
 #define CONFIG_FREERTOS_ISR_STACKSIZE 1536
 #define CONFIG_OPTIMIZATION_LEVEL_DEBUG 1
-#define CONFIG_ESP32_PHY_AUTO_INIT 1
+#define CONFIG_ESP32_PHY_AUTO_INIT 0
 #define CONFIG_SYSTEM_EVENT_QUEUE_SIZE 32
 #define CONFIG_ESPTOOLPY_BAUD_921600B 1
 #define CONFIG_APP_OFFSET 0x10000