ar71xx: add missing ethernet driver fix backport (fixes #10089)

[openwrt-10.03/.git] / target / linux / ar71xx / files / drivers / net / ag71xx / ag71xx_main.c

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index 8e25d4a1f4266891e1a1b0e99da3b9322b8fda37..4a86bb974b8fccd11ec2bf190c328063185fa325 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -806,9 +806,33 @@ static void ag71xx_restart_work_func(struct work_struct *work)
        ag71xx_open(ag->dev);
 }
 
+static bool ag71xx_check_dma_stuck(struct ag71xx *ag, unsigned long timestamp)
+{
+       u32 rx_sm, tx_sm, rx_fd;
+
+       if (likely(time_before(jiffies, timestamp + HZ/10)))
+               return false;
+
+       if (!netif_carrier_ok(ag->dev))
+               return false;
+
+       rx_sm = ag71xx_rr(ag, AG71XX_REG_RX_SM);
+       if ((rx_sm & 0x7) == 0x3 && ((rx_sm >> 4) & 0x7) == 0x6)
+               return true;
+
+       tx_sm = ag71xx_rr(ag, AG71XX_REG_TX_SM);
+       rx_fd = ag71xx_rr(ag, AG71XX_REG_FIFO_DEPTH);
+       if (((tx_sm >> 4) & 0x7) == 0 && ((rx_sm & 0x7) == 0) &&
+           ((rx_sm >> 4) & 0x7) == 0 && rx_fd == 0)
+               return true;
+
+       return false;
+}
+
 static int ag71xx_tx_packets(struct ag71xx *ag)
 {
        struct ag71xx_ring *ring = &ag->tx_ring;
+       struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
        int sent;
 
        DBG("%s: processing TX ring\n", ag->dev->name);
@@ -819,8 +843,12 @@ static int ag71xx_tx_packets(struct ag71xx *ag)
                struct ag71xx_desc *desc = ring->buf[i].desc;
                struct sk_buff *skb = ring->buf[i].skb;
 
-               if (!ag71xx_desc_empty(desc))
+               if (!ag71xx_desc_empty(desc)) {
+                       if (pdata->is_ar7240 &&
+                           ag71xx_check_dma_stuck(ag, ring->buf[i].timestamp))
+                               schedule_work(&ag->restart_work);
                        break;
+               }
 
                ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);