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gianfar: Don't reset TBI<->SerDes link if it's already up

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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>
This commit is contained in:
Trent Piepho 2008-10-30 18:17:07 -07:00 committed by Jeff Garzik
parent c132419e56
commit bdb59f949d
1 changed files with 9 additions and 0 deletions
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9
drivers/net/gianfar.c
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@ -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);
}