PHY: Avoid unnecessary aneg restarts

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The PHY's aneg is configured and restarted whenever the link is brought up,
e.g. when DHCP is started after the kernel has booted.  This can take the
link down for several seconds while auto-negotiation is redone.

If the advertised features haven't changed, then it shouldn't be necessary
to bring down the link and start auto-negotiation over again.

genphy_config_advert() is enhanced to return 0 when the advertised features
haven't been changed and >0 when they have been.

genphy_config_aneg() then uses this information to not call
genphy_restart_aneg() if there has been no change.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Trent Piepho 2008-09-24 10:55:46 +00:00 • committed by David S. Miller

parent 7bf6bf4803

commit 51e2a3846e

1 changed files with 30 additions and 19 deletions

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49

drivers/net/phy/phy_device.c

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