On devices TL-WR841N-v8 and MR3420v2 (AP123 platform) we have common
u-boot bootloader, so the enabled JTAG (by default on TL-WR841N-v8) -
and so its enabled on MR3420v2. It affects on the USB-Power control,
because the One of the pins TCK(GPIO4) is not managed so far enabled
JTAG.
https://dev.openwrt.org/ticket/13201
thx to pepe2k


Signed-off-by: Dmytro <[email protected]>
---
Index: target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n-v8.c
===================================================================
--- target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n-v8.c       
(revision
37080)
+++ target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n-v8.c       
(working copy)
@@ -132,6 +132,9 @@
        u8 *mac = (u8 *) KSEG1ADDR(0x1f01fc00);
        u8 *ee = (u8 *) KSEG1ADDR(0x1fff1000);

+       /* Disable JTAG port, enabling GPIOs 0-3 */
+       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);
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