From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Mon, 26 Nov 2007 19:54:51 +0000 (-0800)
Subject: skge: fiber link up/down fix
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=21d7f67700ad7a4523d35d43ce95755e40eae5b7;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

skge: fiber link up/down fix

The driver would not work over fibre if other end when down then
came back up (would require reloading driver). The correct way
to manage the link the same way for both TP and fibre.

Resloves problem described in: 	 http://lkml.org/lkml/2007/11/6/395

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index b680cb08e9c..73a424694ac 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -1095,16 +1095,9 @@ static void xm_link_down(struct skge_hw *hw, int port)
 {
 	struct net_device *dev = hw->dev[port];
 	struct skge_port *skge = netdev_priv(dev);
-	u16 cmd = xm_read16(hw, port, XM_MMU_CMD);
 
 	xm_write16(hw, port, XM_IMSK, XM_IMSK_DISABLE);
 
-	cmd &= ~(XM_MMU_ENA_RX | XM_MMU_ENA_TX);
-	xm_write16(hw, port, XM_MMU_CMD, cmd);
-
-	/* dummy read to ensure writing */
-	xm_read16(hw, port, XM_MMU_CMD);
-
 	if (netif_carrier_ok(dev))
 		skge_link_down(skge);
 }
@@ -1194,6 +1187,7 @@ static void genesis_init(struct skge_hw *hw)
 static void genesis_reset(struct skge_hw *hw, int port)
 {
 	const u8 zero[8]  = { 0 };
+	u32 reg;
 
 	skge_write8(hw, SK_REG(port, GMAC_IRQ_MSK), 0);
 
@@ -1209,6 +1203,11 @@ static void genesis_reset(struct skge_hw *hw, int port)
 		xm_write16(hw, port, PHY_BCOM_INT_MASK, 0xffff);
 
 	xm_outhash(hw, port, XM_HSM, zero);
+
+	/* Flush TX and RX fifo */
+	reg = xm_read32(hw, port, XM_MODE);
+	xm_write32(hw, port, XM_MODE, reg | XM_MD_FTF);
+	xm_write32(hw, port, XM_MODE, reg | XM_MD_FRF);
 }
 
 
@@ -1714,6 +1713,12 @@ static void genesis_stop(struct skge_port *skge)
 	struct skge_hw *hw = skge->hw;
 	int port = skge->port;
 	unsigned retries = 1000;
+	u16 cmd;
+
+ 	/* Disable Tx and Rx */
+	cmd = xm_read16(hw, port, XM_MMU_CMD);
+	cmd &= ~(XM_MMU_ENA_RX | XM_MMU_ENA_TX);
+	xm_write16(hw, port, XM_MMU_CMD, cmd);
 
 	genesis_reset(hw, port);