Check the EEPROM flag before writing flags in EEPROM

Signed-off-by: Josh Tsai <josh_tsai@compal.corp-partner.google.com>

Author: Josh Tsai

board/hx30/board.c

@@ -376,13 +376,11 @@ void board_reset_pd_mcu(void)
 void spi_mux_control(int enable)
 {
 	if (enable) {
-		CPRINTS("switch to spi mode");
 		/* Disable LED drv */
 		gpio_set_level(GPIO_TYPEC_G_DRV2_EN, 0);
 		/* Set GPIO56 as SPI for access SPI ROM */
 		gpio_set_alternate_function(1, 0x4000, 2);
 	} else {
-		CPRINTS("switch to pwm mode");
 		/* Enable LED drv */
 		gpio_set_level(GPIO_TYPEC_G_DRV2_EN, 1);
 		/* Set GPIO56 as SPI for access SPI ROM */
@@ -401,6 +399,8 @@ void board_spi_read_byte(uint8_t offset, uint8_t *data)
 	if (rv != EC_SUCCESS)
 		CPRINTS("SPI fail to read");
 
+	CPRINTS("%s, offset:0x%02x, data:0x%02x", __func__, offset, *data);
+
 	spi_mux_control(0);
 }
 
@@ -420,6 +420,8 @@ void board_spi_write_byte(uint8_t offset, uint8_t data)
 	if (rv != EC_SUCCESS)
 		CPRINTS("SPI fail to write");
 
+	CPRINTS("%s, offset:0x%02x, data:0x%02x", __func__, offset, data);
+
 	spi_mux_control(0);
 }
 

board/hx30/host_command_customization.c

@@ -56,11 +56,20 @@ void set_non_acpi_mode(int enable)
 
 static void sci_enable(void)
 {
+	uint8_t dataInSPI;
+	int dataInEMI;
+
 	if (*host_get_customer_memmap(0x00) & BIT(0)) {
 	/* when host set EC driver ready flag, EC need to enable SCI */
 		lpc_set_host_event_mask(LPC_HOST_EVENT_SCI, SCI_HOST_EVENT_MASK);
 		update_soc_power_limit(true, false);
-		board_spi_write_byte(SPI_AC_BOOT_OFFSET, ac_boot_status());
+
+	/* check the Flag in EEPROM and EMI, if values are different, write the value in EEPROM */
+		board_spi_read_byte(SPI_AC_BOOT_OFFSET, &dataInSPI);
+		dataInEMI = ac_boot_status();
+		if ((int)dataInSPI != dataInEMI)
+			board_spi_write_byte(SPI_AC_BOOT_OFFSET, (uint8_t)dataInEMI);
+
 		set_non_acpi_mode(0);
 	} else
 		hook_call_deferred(&sci_enable_data, 250 * MSEC);