From ec0030609eb4c655c607364f70938ac6b44106bc Mon Sep 17 00:00:00 2001
From: chenjianqiang <chenjianqiang@espressif.com>
Date: Fri, 5 Jun 2020 21:06:21 +0800
Subject: [PATCH] psram: fix 16mbit psram id read error

---
 components/esp32/spiram_psram.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/components/esp32/spiram_psram.c b/components/esp32/spiram_psram.c
index e094b306b..d0fc1983a 100644
--- a/components/esp32/spiram_psram.c
+++ b/components/esp32/spiram_psram.c
@@ -895,8 +895,14 @@ esp_err_t IRAM_ATTR psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vad
     bootloader_common_vddsdio_configure();
     // GPIO related settings
     psram_gpio_config(&psram_io, mode);
+
+    /* 16Mbit psram ID read error
+     * workaround: Issue a pre-condition of dummy read id, then Read ID command
+     */
+    psram_read_id(&s_psram_id);
     psram_read_id(&s_psram_id);
     if (!PSRAM_IS_VALID(s_psram_id)) {
+        ESP_EARLY_LOGE(TAG, "PSRAM ID read error: 0x%08x", (uint32_t)s_psram_id);
         return ESP_FAIL;
     }