ar71xx: rb91x: fix ethernet packet loss issues

The RB91x boards are suffering from ethernet packet loss after a cold
boot. The cause of the problem is that the AR8035 PHYs requires special
register settings to work reliably on these boards.

Enable the RGMII TX, RX delays and disable SmartEE functionality of
the AR8035 PHYs. Also enable the RXD delay in the ETH_CFG register
to fix the issue.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 40509

target/linux/ar71xx/files/arch/mips/ath79/mach-rb91x.c

@@ -24,6 +24,7 @@
 #include <linux/gpio.h>
 #include <linux/platform_data/gpio-latch.h>
 #include <linux/platform_data/rb91x_nand.h>
+#include <linux/platform_data/phy-at803x.h>
 
 #include <asm/prom.h>
 #include <asm/mach-ath79/ath79.h>
@@ -223,6 +224,20 @@ static struct gpio_led rb711gr100_leds[] __initdata = {
 	},
 };
 
+static struct at803x_platform_data rb91x_at803x_data = {
+	.disable_smarteee = 1,
+	.enable_rgmii_rx_delay = 1,
+	.enable_rgmii_tx_delay = 1,
+};
+
+static struct mdio_board_info rb91x_mdio0_info[] = {
+	{
+		.bus_id = "ag71xx-mdio.0",
+		.phy_addr = 0,
+		.platform_data = &rb91x_at803x_data,
+	},
+};
+
 static void __init rb711gr100_init_partitions(const struct rb_info *info)
 {
 	rb711gr100_spi_partitions[0].size = info->hard_cfg_offs;
@@ -293,10 +308,14 @@ static void __init rb711gr100_setup(void)
 			   ARRAY_SIZE(rb711gr100_spi_info));
 
 	ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_RGMII_GMAC0 |
+				   AR934X_ETH_CFG_RXD_DELAY |
 				   AR934X_ETH_CFG_SW_ONLY_MODE);
 
 	ath79_register_mdio(0, 0x0);
 
+	mdiobus_register_board_info(rb91x_mdio0_info,
+				    ARRAY_SIZE(rb91x_mdio0_info));
+
 	ath79_init_mac(ath79_eth0_data.mac_addr, ath79_mac_base, 0);
 	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII;
 	ath79_eth0_data.phy_mask = BIT(0);