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Commit bdb59f94 authored by Trent Piepho's avatar Trent Piepho Committed by Jeff Garzik
Browse files

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: default avatarTrent Piepho <tpiepho@freescale.com>
Acked-by: default avatarAndy Fleming <afleming@freescale.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent c132419e

drivers/net/gianfar.c

+9 −0
Original line number Diff line number Diff line
@@ -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);

}