[PATCH 1/2] netdev/fec: fix phy_speed caculating

[Bryan Wu]

BugLink: http://bugs.launchpad.net/bugs/546649
BugLink: http://bugs.launchpad.net/bugs/457878

 - remove duplicated phy_speed caculation
 - fix the phy_speed caculation according to the DataSheet

Signed-off-by: Bryan Wu <bryan.wu at canonical.com>
---
 drivers/net/fec.c |    9 ++-------
 1 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 9d99359..53240d3 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -737,10 +737,9 @@ static int fec_enet_mii_init(struct platform_device *pdev)
 	fep->mii_timeout = 0;
 
 	/*
-	 * Set MII speed to 2.5 MHz
+	 * Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed)
 	 */
-	fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999)
-					/ 2500000) / 2) & 0x3F) << 1;
+	fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000) << 1;
 	writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 
 	fep->mii_bus = mdiobus_alloc();
@@ -1121,10 +1120,6 @@ int __init fec_enet_init(struct net_device *dev, int index)
 	dev->netdev_ops = &fec_netdev_ops;
 	dev->ethtool_ops = &fec_enet_ethtool_ops;
 
-	/* Set MII speed to 2.5 MHz */
-	fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999)
-					/ 2500000) / 2) & 0x3F) << 1;
-
 	/* Initialize the receive buffer descriptors. */
 	bdp = fep->rx_bd_base;
 	for (i = 0; i < RX_RING_SIZE; i++) {
-- 
1.7.0.1