diff options
Diffstat (limited to 'drivers/net/gianfar.c')
| -rw-r--r-- | drivers/net/gianfar.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index 64b201134fd..83a5cb6aa23 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -586,6 +586,18 @@ static void gfar_configure_serdes(struct net_device *dev) struct gfar_mii __iomem *regs = (void __iomem *)&priv->regs->gfar_mii_regs; int tbipa = gfar_read(&priv->regs->tbipa); + struct mii_bus *bus = gfar_get_miibus(priv); + + if (bus) + mutex_lock(&bus->mdio_lock); + + /* If the link is already up, we must already be ok, and don't need to + * configure and reset the TBI<->SerDes link. Maybe U-Boot configured + * everything for us? Resetting it takes the link down and requires + * several seconds for it to come back. + */ + if (gfar_local_mdio_read(regs, tbipa, MII_BMSR) & BMSR_LSTATUS) + goto done; /* Single clk mode, mii mode off(for serdes communication) */ gfar_local_mdio_write(regs, tbipa, MII_TBICON, TBICON_CLK_SELECT); @@ -596,6 +608,10 @@ static void gfar_configure_serdes(struct net_device *dev) gfar_local_mdio_write(regs, tbipa, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000); + + done: + if (bus) + mutex_unlock(&bus->mdio_lock); } static void init_registers(struct net_device *dev) |