From cbc5a38e26f78427738df558b65781285d5cc61a Mon Sep 17 00:00:00 2001
From: hongshuqing <hongshuqing@espressif.com>
Date: Wed, 26 Apr 2023 15:31:18 +0800
Subject: [PATCH] support h2 eco2 fosc calibration

---
 .../esp_hw_support/port/esp32h2/rtc_clk_init.c    |  3 +++
 components/esp_hw_support/port/esp32h2/rtc_time.c | 11 +++++++++++
 components/hal/esp32h2/include/hal/clk_tree_ll.h  | 15 +++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/components/esp_hw_support/port/esp32h2/rtc_clk_init.c b/components/esp_hw_support/port/esp32h2/rtc_clk_init.c
index 23f9e53e00..aaa476e5b6 100644
--- a/components/esp_hw_support/port/esp32h2/rtc_clk_init.c
+++ b/components/esp_hw_support/port/esp32h2/rtc_clk_init.c
@@ -19,6 +19,7 @@
 #include "esp_hw_log.h"
 #include "sdkconfig.h"
 #include "esp_rom_uart.h"
+#include "hal/clk_tree_ll.h"
 
 static const char *TAG = "rtc_clk_init";
 
@@ -39,6 +40,8 @@ void rtc_clk_init(rtc_clk_config_t cfg)
     REGI2C_WRITE_MASK(I2C_PMU, I2C_PMU_OC_SCK_DCAP, cfg.slow_clk_dcap);
     REG_SET_FIELD(LP_CLKRST_RC32K_CNTL_REG, LP_CLKRST_RC32K_DFREQ, cfg.rc32k_dfreq);
 
+    clk_ll_rc_fast_tick_conf();
+
     rtc_xtal_freq_t xtal_freq = cfg.xtal_freq;
     esp_rom_uart_tx_wait_idle(0);
     rtc_clk_xtal_freq_update(xtal_freq);
diff --git a/components/esp_hw_support/port/esp32h2/rtc_time.c b/components/esp_hw_support/port/esp32h2/rtc_time.c
index b68488d7e3..e007a7e57d 100644
--- a/components/esp_hw_support/port/esp32h2/rtc_time.c
+++ b/components/esp_hw_support/port/esp32h2/rtc_time.c
@@ -12,6 +12,8 @@
 #include "soc/timer_group_reg.h"
 #include "esp_rom_sys.h"
 #include "assert.h"
+#include "hal/efuse_hal.h"
+#include "soc/chip_revision.h"
 
 static const char *TAG = "rtc_time";
 
@@ -129,6 +131,15 @@ uint32_t rtc_clk_cal_internal(rtc_cal_sel_t cal_clk, uint32_t slowclk_cycles)
     while (true) {
         if (GET_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_RDY)) {
             cal_val = REG_GET_FIELD(TIMG_RTCCALICFG1_REG(0), TIMG_RTC_CALI_VALUE);
+
+            /*The Fosc CLK of calibration circuit is divided by 32 for ECO2.
+              So we need to multiply the frequency of the Fosc for ECO2 and above chips by 32 times.
+              And ensure that this modification will not affect ECO0 and ECO1.*/
+            if (ESP_CHIP_REV_ABOVE(efuse_hal_chip_revision(), 2)) {
+                if (cal_clk == RTC_CAL_RC_FAST) {
+                    cal_val = cal_val >> 5;
+                }
+            }
             break;
         }
         if (GET_PERI_REG_MASK(TIMG_RTCCALICFG2_REG(0), TIMG_RTC_CALI_TIMEOUT)) {
diff --git a/components/hal/esp32h2/include/hal/clk_tree_ll.h b/components/hal/esp32h2/include/hal/clk_tree_ll.h
index 236cc9f6c3..d1a34a7089 100644
--- a/components/hal/esp32h2/include/hal/clk_tree_ll.h
+++ b/components/hal/esp32h2/include/hal/clk_tree_ll.h
@@ -39,6 +39,13 @@ extern "C" {
     .dbuf = 1, \
 }
 
+/*
+Set the frequency division factor of ref_tick
+The FOSC of rtc calibration uses the 32 frequency division clock for ECO2,
+So the frequency division factor of ref_tick must be greater than or equal to 32
+*/
+#define REG_FOSC_TICK_NUM  255
+
 /**
  * @brief XTAL32K_CLK enable modes
  */
@@ -735,6 +742,14 @@ static inline __attribute__((always_inline)) uint32_t clk_ll_rtc_slow_load_cal(v
     return REG_READ(RTC_SLOW_CLK_CAL_REG);
 }
 
+/*
+Set the frequency division factor of ref_tick
+*/
+static inline void clk_ll_rc_fast_tick_conf(void)
+{
+    PCR.ctrl_tick_conf.fosc_tick_num = REG_FOSC_TICK_NUM;
+}
+
 #ifdef __cplusplus
 }
 #endif