diff options
| author | Trent Piepho <tpiepho@freescale.com> | 2008-10-31 04:17:07 +0300 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-10-31 07:59:53 +0300 |
| commit | bdb59f949d663b7e943fb5f40b2557af4314abf9 (patch) | |
| tree | c9ddebc19917166f27471cc1994aa19c80b72773 /drivers/net/gianfar.c | |
| parent | c132419e560a2ecd3c8cf77f9c37e103e74b3754 (diff) | |
| download | linux-bdb59f949d663b7e943fb5f40b2557af4314abf9.tar.xz | |
gianfar: Don't reset TBI<->SerDes link if it's already up
The link may be up already via the chip's reset strapping, or though action
of U-Boot, or from the last time the interface was brought up. Resetting
the link causes it to go down for several seconds. This can significantly
increase the time from power-on to DHCP completion and a device being
accessible to the network.
Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/gianfar.c')
| -rw-r--r-- | drivers/net/gianfar.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index 249541a1814b..83a5cb6aa23b 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -591,6 +591,14 @@ static void gfar_configure_serdes(struct net_device *dev) 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); @@ -601,6 +609,7 @@ 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); } |