ar71xx: Fix WD My Net N600 weak signal issue

The LNAs need to be enabled by setting their respective GPIO to high even
though the original firmware's setting sets them to low on initialization.

Obviously the LNAs are then later initialized by the driver on the OEM
firmware. Without this fix the device is mostly "deaf".

Signed-off-by: Felix Kaechele <heffer@fedoraproject.org>
Tested-by: Steven Haigh <netwiz@crc.id.au>
Patchwork: http://patchwork.openwrt.org/patch/4689/
[juhosg:
  - remove the GPIO LED changes, the My Net N600 has no yellow LEDs at all,
  - change subject and update the commit message]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39214 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-mynet-n600.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-mynet-n600.c
index 476cff8..9e785ca 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-mynet-n600.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-mynet-n600.c
@@ -42,6 +42,9 @@
 #define MYNET_N600_GPIO_BTN_RESET      16
 #define MYNET_N600_GPIO_BTN_WPS                17
 
+#define MYNET_N600_GPIO_EXTERNAL_LNA0  14
+#define MYNET_N600_GPIO_EXTERNAL_LNA1  15
+
 #define MYNET_N600_KEYS_POLL_INTERVAL  20      /* msecs */
 #define MYNET_N600_KEYS_DEBOUNCE_INTERVAL (3 * MYNET_N600_KEYS_POLL_INTERVAL)
 
@@ -152,6 +155,18 @@ static void __init mynet_n600_setup(void)
                                        ARRAY_SIZE(mynet_n600_gpio_keys),
                                        mynet_n600_gpio_keys);
 
+       /*
+        * Control signal for external LNAs 0 and 1
+        * Taken from GPL bootloader source:
+        *   board/ar7240/db12x/alpha_gpio.c
+        */
+       gpio_request_one(MYNET_N600_GPIO_EXTERNAL_LNA0,
+                        GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED,
+                        "External LNA0");
+       gpio_request_one(MYNET_N600_GPIO_EXTERNAL_LNA1,
+                        GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED,
+                        "External LNA1");
+
        mynet_n600_get_mac("wlan24mac=", tmpmac);
        ath79_register_wmac(art + MYNET_N600_WMAC_CALDATA_OFFSET, tmpmac);