Tegra: init the console only if the platform supports it

Some platforms might want to keep the uart console disabled
during boot. This patch checks if the platform supports a
console, before calling console_init().

Change-Id: Icc9c59cb979d91fd0a72e4732403b3284bdd2dfc
Signed-off-by: Damon Duan <danield@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/tegra_bl31_setup.c

@@ -188,18 +188,18 @@ void bl31_early_platform_setup(bl31_params_t *from_bl2,
 	 * Get the base address of the UART controller to be used for the
 	 * console
 	 */
-	assert(plat_params->uart_id);
 	tegra_console_base = plat_get_console_from_id(plat_params->uart_id);
 
+	if (tegra_console_base != (uint64_t)0) {
 		/*
 		 * Configure the UART port to be used as the console
 		 */
-	assert(tegra_console_base);
 		console_init(tegra_console_base, TEGRA_BOOT_UART_CLK_IN_HZ,
 			TEGRA_CONSOLE_BAUDRATE);
 
 		/* Initialise crash console */
 		plat_crash_console_init();
+	}
 
 	/*
 	 * Do initial security configuration to allow DRAM/device access.

plat/nvidia/tegra/common/tegra_pm.c

@@ -214,8 +214,10 @@ void tegra_pwr_domain_on_finish(const psci_power_state_t *target_state)
 			PSTATE_ID_SOC_POWERDN) {
 
 		/* Initialize the runtime console */
+		if (tegra_console_base != (uint64_t)0) {
 			console_init(tegra_console_base, TEGRA_BOOT_UART_CLK_IN_HZ,
 				TEGRA_CONSOLE_BAUDRATE);
+		}
 
 		/*
 		 * Restore Memory Controller settings as it loses state