gianfar: keep vlan related state when restart

If vlan has been enabled. ifdown followed by ifup will lost hardware
related state.

Also remove duplicated operation in gfar_vlan_rx_register().

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Acked-by: Dai Haruki <dai.haruki@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index f8ffcbf..e212f2c 100644 (file)
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -936,6 +936,7 @@ int startup_gfar(struct net_device *dev)
        struct gfar __iomem *regs = priv->regs;
        int err = 0;
        u32 rctrl = 0;
+       u32 tctrl = 0;
        u32 attrs = 0;
 
        gfar_write(&regs->imask, IMASK_INIT_CLEAR);
@@ -1111,11 +1112,19 @@ int startup_gfar(struct net_device *dev)
                rctrl |= RCTRL_PADDING(priv->padding);
        }
 
+       /* keep vlan related bits if it's enabled */
+       if (priv->vlgrp) {
+               rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
+               tctrl |= TCTRL_VLINS;
+       }
+
        /* Init rctrl based on our settings */
        gfar_write(&priv->regs->rctrl, rctrl);
 
        if (dev->features & NETIF_F_IP_CSUM)
-               gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
+               tctrl |= TCTRL_INIT_CSUM;
+
+       gfar_write(&priv->regs->tctrl, tctrl);
 
        /* Set the extraction length and index */
        attrs = ATTRELI_EL(priv->rx_stash_size) |
@@ -1450,7 +1459,6 @@ static void gfar_vlan_rx_register(struct net_device *dev,
 
                /* Enable VLAN tag extraction */
                tempval = gfar_read(&priv->regs->rctrl);
-               tempval |= RCTRL_VLEX;
                tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
                gfar_write(&priv->regs->rctrl, tempval);
        } else {