ar71xx: disable JTAG on TL-WR841N-v8/MR3420v2

It also fixes USB Power on MR3420v2.

Signed-off-by: Dmytro <dioptimizer@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37194 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n-v8.c

@@ -132,6 +132,9 @@ static void __init tl_ap123_setup(void)
 	u8 *mac = (u8 *) KSEG1ADDR(0x1f01fc00);
 	u8 *ee = (u8 *) KSEG1ADDR(0x1fff1000);
 
+	/* Disable JTAG, enabling GPIOs 0-4 */
+	ath79_gpio_function_enable(AR934X_GPIO_FUNC_JTAG_DISABLE);
+
 	ath79_register_m25p80(&tl_wr841n_v8_flash_data);
 
 	ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_SW_PHY_SWAP);