[U-Boot] [PATCH] sun8i_emac: Fix mdio read sequence

[Andre Przywara]

From: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>

To send a parametrized command to the PHY over MDIO, we should write
the data first, the trigger the execution by the command register
write. Fix the access pattern in our MDIO write routine.
Apparently this doesn't really matter with the Realtek PHY on the
Pine64, but other PHYs (which require more setup) will choke on
the wrong order.
[Andre: add commit message]

Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 drivers/net/sun8i_emac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 6ac8ba3..abd9cc8 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -180,8 +180,8 @@ static int sun8i_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
 	miiaddr |= MDIO_CMD_MII_WRITE;
 	miiaddr |= MDIO_CMD_MII_BUSY;
 
-	writel(miiaddr, priv->mac_reg + EMAC_MII_CMD);
 	writel(val, priv->mac_reg + EMAC_MII_DATA);
+	writel(miiaddr, priv->mac_reg + EMAC_MII_CMD);
 
 	start = get_timer(0);
 	while (get_timer(start) < timeout) {
-- 
2.8.2