soc/amd/cezanne: enable LPC decodes if platform uses LPC

Change-Id: I2473fe61b299d1c6221844cd744791b8012c5c67
Signed-off-by: Jeremy Soller <jeremy@system76.com>

src/soc/amd/cezanne/early_fch.c

@@ -21,6 +21,12 @@ static const struct soc_i2c_scl_pin i2c_scl_pins[] = {
 	I2C_RESET_SCL_PIN(I2C3_SCL_PIN, GPIO_I2C3_SCL),
 };
 
+static void lpc_configure_decodes(void)
+{
+	if (CONFIG(POST_IO) && (CONFIG_POST_IO_PORT == 0x80))
+		lpc_enable_port80();
+}
+
 static void reset_i2c_peripherals(void)
 {
 	const struct soc_amd_cezanne_config *cfg = config_of_soc();
@@ -41,6 +47,9 @@ void fch_pre_init(void)
 	/* Setup SPI base by calling lpc_early_init before setting up eSPI. */
 	lpc_early_init();
 
+	if (!CONFIG(SOC_AMD_COMMON_BLOCK_USE_ESPI))
+		lpc_configure_decodes();
+
 	/* Setup eSPI to enable port80 routing if the board is using eSPI and the eSPI
 	   interface hasn't already been set up in verstage on PSP */
 	if (CONFIG(SOC_AMD_COMMON_BLOCK_USE_ESPI) && !CONFIG(VBOOT_STARTS_BEFORE_BOOTBLOCK))