skge: retry on MAC shutdown

Make sure and retry when shutting down the MAC. This code is copied
from sk98lin driver.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/skge.c

@@ -1713,7 +1713,7 @@ static void genesis_stop(struct skge_port *skge)
 {
 	struct skge_hw *hw = skge->hw;
 	int port = skge->port;
-	u32 reg;
+	unsigned retries = 1000;
 
 	genesis_reset(hw, port);
 
@@ -1721,20 +1721,17 @@ static void genesis_stop(struct skge_port *skge)
 	skge_write16(hw, B3_PA_CTRL,
 		     port == 0 ? PA_CLR_TO_TX1 : PA_CLR_TO_TX2);
 
-	/*
-	 * If the transfer sticks at the MAC the STOP command will not
-	 * terminate if we don't flush the XMAC's transmit FIFO !
-	 */
-	xm_write32(hw, port, XM_MODE,
-			xm_read32(hw, port, XM_MODE)|XM_MD_FTF);
-
-
 	/* Reset the MAC */
+	skge_write16(hw, SK_REG(port, TX_MFF_CTRL1), MFF_CLR_MAC_RST);
+	do {
 		skge_write16(hw, SK_REG(port, TX_MFF_CTRL1), MFF_SET_MAC_RST);
+		if (!(skge_read16(hw, SK_REG(port, TX_MFF_CTRL1)) & MFF_SET_MAC_RST))
+			break;
+	} while (--retries > 0);
 
 	/* For external PHYs there must be special handling */
 	if (hw->phy_type != SK_PHY_XMAC) {
-		reg = skge_read32(hw, B2_GP_IO);
+		u32 reg = skge_read32(hw, B2_GP_IO);
 		if (port == 0) {
 			reg |= GP_DIR_0;
 			reg &= ~GP_IO_0;