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ar71xx: only enable the rx engine after the link is up, fixes a race condition that got rx stuck when the interface is brought up during lots of inbound traffic (thx, matteo) 

SVN-Revision: 27035
lede-17.01
Felix Fietkau 2011-05-30 23:08:01 +00:00
parent 0ebc93831f
commit 2b5402d128
1 changed files with 68 additions and 67 deletions
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135
target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
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@ -344,6 +344,71 @@ static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
return "?";
}
static void ag71xx_dma_reset(struct ag71xx *ag)
{
u32 val;
int i;
ag71xx_dump_dma_regs(ag);
/* stop RX and TX */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
/*
* give the hardware some time to really stop all rx/tx activity
* clearing the descriptors too early causes random memory corruption
*/
mdelay(1);
/* clear descriptor addresses */
ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
/* clear pending RX/TX interrupts */
for (i = 0; i < 256; i++) {
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
}
/* clear pending errors */
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
if (val)
printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
ag->dev->name, val);
val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
/* mask out reserved bits */
val &= ~0xff000000;
if (val)
printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
ag->dev->name, val);
ag71xx_dump_dma_regs(ag);
}
static void ag71xx_hw_start(struct ag71xx *ag)
{
/* start RX engine */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
/* enable interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
}
static void ag71xx_hw_stop(struct ag71xx *ag)
{
/* disable all interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
ag71xx_dma_reset(ag);
}
void ag71xx_link_adjust(struct ag71xx *ag)
{
struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
@ -353,6 +418,7 @@ void ag71xx_link_adjust(struct ag71xx *ag)
u32 mii_speed;
if (!ag->link) {
ag71xx_hw_stop(ag);
netif_carrier_off(ag->dev);
if (netif_msg_link(ag))
printk(KERN_INFO "%s: link down\n", ag->dev->name);
@ -405,6 +471,8 @@ void ag71xx_link_adjust(struct ag71xx *ag)
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
ag71xx_hw_start(ag);
netif_carrier_on(ag->dev);
if (netif_msg_link(ag))
printk(KERN_INFO "%s: link up (%sMbps/%s duplex)\n",
@ -444,54 +512,6 @@ static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
}
static void ag71xx_dma_reset(struct ag71xx *ag)
{
u32 val;
int i;
ag71xx_dump_dma_regs(ag);
/* stop RX and TX */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
/*
* give the hardware some time to really stop all rx/tx activity
* clearing the descriptors too early causes random memory corruption
*/
mdelay(1);
/* clear descriptor addresses */
ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
/* clear pending RX/TX interrupts */
for (i = 0; i < 256; i++) {
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
}
/* clear pending errors */
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
if (val)
printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
ag->dev->name, val);
val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
/* mask out reserved bits */
val &= ~0xff000000;
if (val)
printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
ag->dev->name, val);
ag71xx_dump_dma_regs(ag);
}
#define MAC_CFG1_INIT (MAC_CFG1_RXE | MAC_CFG1_TXE | \
MAC_CFG1_SRX | MAC_CFG1_STX)
@ -550,23 +570,6 @@ static void ag71xx_hw_init(struct ag71xx *ag)
ag71xx_dma_reset(ag);
}
static void ag71xx_hw_start(struct ag71xx *ag)
{
/* start RX engine */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
/* enable interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
}
static void ag71xx_hw_stop(struct ag71xx *ag)
{
/* disable all interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
ag71xx_dma_reset(ag);
}
static int ag71xx_open(struct net_device *dev)
{
struct ag71xx *ag = netdev_priv(dev);
@ -586,8 +589,6 @@ static int ag71xx_open(struct net_device *dev)
ag71xx_hw_set_macaddr(ag, dev->dev_addr);
ag71xx_hw_start(ag);
netif_start_queue(dev);
return 0;